WO2011073555A1 - Cowl vent grille device for filtering air - Google Patents

Cowl vent grille device for filtering air Download PDF

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Publication number
WO2011073555A1
WO2011073555A1 PCT/FR2010/052687 FR2010052687W WO2011073555A1 WO 2011073555 A1 WO2011073555 A1 WO 2011073555A1 FR 2010052687 W FR2010052687 W FR 2010052687W WO 2011073555 A1 WO2011073555 A1 WO 2011073555A1
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WO
WIPO (PCT)
Prior art keywords
frame
filter screen
grid
air
opening
Prior art date
Application number
PCT/FR2010/052687
Other languages
French (fr)
Inventor
Charles De La Quintana
Original Assignee
Renault S.A.S.
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 Renault S.A.S. filed Critical Renault S.A.S.
Publication of WO2011073555A1 publication Critical patent/WO2011073555A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0005—Mounting of filtering elements within casings, housings or frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B01D46/522—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with specific folds, e.g. having different lengths
    • 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
    • B60H3/00—Other air-treating devices
    • B60H3/06—Filtering
    • B60H3/0608—Filter arrangements in the air stream
    • B60H3/0641—Filter arrangements in the air stream near ventilating openings in the vehicle exterior
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/50—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for air conditioning

Definitions

  • the invention relates to a motor vehicle grille device, and more particularly to a motor vehicle awning grille device comprising a frame delimiting at least one opening and a filtering screen covering the opening and connected to the frame.
  • HVAC device Heating and Ventilation Air Conditioning
  • the invention is intended to provide protection upstream of the blower device when in particular the air treatment filter of the cabin is placed inside the HVAC device. This protection is intended to be placed at stay in the vehicle. There is no provision for replacement as is the case in the cabin filter equipped with filter media.
  • the invention relates to a motor vehicle grille device which has improved filtration qualities and a reduced pressure drop and whose manufacture is simple and inexpensive.
  • the invention proposes a grid device intended to allow the entry of air inside the vehicle, comprising a frame delimiting at least one opening and a filtering screen covering the opening and connected to the frame, the filtration screen comprising a pleating whose folds extend in at least one direction to increase the distribution area of the air flow relative to the sectional area of the opening.
  • the invention thus makes it possible to improve coarse filtration upstream by allowing large particles to be stopped, which may eventually cause damage to the blower or evaporator of the HVAC device.
  • the invention does not make it possible to filter the air of the passenger compartment for the safety of the occupants, but only to protect upstream the technical devices which can undergo heavy damage in the countries where the air contains large quantities of dust in suspension.
  • the filter screen may be provided with areas around its periphery to bond to the frame where the pleating is reduced or absent so as to improve the connection of the filter screen to the frame, thereby increasing the ease of manufacture and reduces the rate of rebus. It is also possible to ensure that the filtering screen is bonded to the frame by fastening means chosen from staples, pins, clips or by a method chosen from a weld or a glue, which allows a particularly economical production and simple.
  • the device further comprises a strapping provided to be fixed on at least a part of the periphery of the frame so that the areas of the sieve intended to bind to the frame are pinched between the frame and the strapping. , which increases the strength of the device by distributing the force of the connection between the screen and the frame over an extended area.
  • the filter screen may be made from a material for pleating by a thermoforming process, which makes it unnecessary to attach parts.
  • the filter screen has a mesh size of between 0.5 mm and 7 mm and preferably of between 2 mm and 7 mm, which makes it possible to combine a high filtration capacity and a pressure drop. scaled down.
  • the pleating folds have a height Hp of between 0.3 cm and 1.5 cm.
  • the folds may have a pitch Pp between 0.3 cm and 0.8 cm.
  • the frame can be made to have a frame extending through the opening to allow filter screen support, thereby reducing the risk of sieve deterioration by external elements.
  • the filter screen includes an active carbon compound, to provide additive air treatment capabilities to the filter.
  • the invention also relates to a vehicle comprising an air filtration device of the passenger compartment disposed inside the HVAC device, and a grid device intended to allow the entry of air inside the vehicle having the characteristics disclosed above.
  • FIG. 1 is a perspective view of a vehicle comprising a canopy grille device according to the invention.
  • FIG. 1 is a top view of the canopy grill alone.
  • FIG. 3 is a view of section 3-3 of the awning grid of FIG.
  • FIG. 4 is a schematic perspective view of the periphery of the awning grid.
  • a vehicle 100 comprises an external grid 12.
  • the awning grid 12 is a plastic part extending in a transverse direction between a windshield 14 and a cover 16 of the vehicle 100 and covering a water box (not shown) of said vehicle 100
  • This type of grid is commonly called “awning grid” and is intended to allow the entry of air inside the vehicle, via the air conditioning and ventilation device.
  • the awning grid 12 comprises a frame 10 intended to be fixed on elements (not shown) of the vehicle 100, by screwing or clipping for example.
  • This frame 10 defines an opening 22 embodying the cabin air inlet.
  • the opening 22 is covered by a filter screen 26.
  • the filtration screen 26 has a mesh formed of substantially circular holes, which may for example have a size of 0.5 millimeters to 7 millimeters and preferably a size of between 2 millimeters to 7 millimeters.
  • the size of the holes depends on the appearance desired for the awning grid 12, constraints related to the air flow desired to ventilate the passenger compartment but also the geometry of the foreign objects targeted, mainly their minimum diameter.
  • the filtration screen is a part intended to be permanently fixed in the vehicle, it does not constitute a wear part, which is changed after a certain rolling time, as is the case for example , specifically for the "mediafiltrant" filters belonging to the HVAC system. It is not intended to protect the occupant by filtering fine particles as is the case for media filter filters. Its function is to ensure filtration at the air intake to protect the blower material including the HVAC system.
  • meshes formed from other geometric shapes such as square holes or oblong holes.
  • this filtering screen 26 has a pleating, as shown in FIG. 3. Thanks to this pleating, the given airflow pressure drop of this filtration screen 26 with respect to a filtering filter of the state of the art, such as that described in patent document FR0753274, can be kept constant while increasing the fineness of the mesh, or in other words by reducing the dimensions or the thickness In fact, the effective area, that is to say the surface of filtration screen 26 actually traversed by the air increases due to the pleating, which allows to increase the smoothness. mesh, maintaining a loss of equivalent load due to the lowering of the average air speed. In other words, pleating allows to have a useful surface of the filtration screen 26 greater than the surface of the opening 22.
  • the filtering sieve 26 is made from a material that makes it possible to pleat by a thermoforming process.
  • the sieve 26 is a flexible plastic part of the polypropylene type.
  • the sieve 26 may undergo a surface treatment to increase its weather resistance, U.V. and aging resistance qualities.
  • the filter screen 26 comprises an activated carbon compound.
  • Figure 3 shows the profile of the folds of this pleating in a cross sectional plane perpendicular to the flow of air through the opening 22, or in Figure 3 in the plane L-T.
  • the height Hp of the folds, taken peak-to-peak, is between 0.3 cm and 1, 5 cm.
  • the pitch pitch Pp that is to say the distance between two ridges pointing in the same direction, either upwards or downwards, is between 0.3 cm and 0.8 cm.
  • the filtering screen 26 comprises, around its periphery, zones 26E intended to be bonded to the frame 10 where the pleating is reduced or absent so as to improve the connection of the filtering screen 26 to the frame 10.
  • the screen 26 is connected to the frame by fastening means (not shown) selected from staples, pins or clips.
  • the sieve 26 is bonded to the frame 10 by gluing or by a welding process.
  • the zones 26E located around the periphery of the sieve 26 can be pressed against the frame 10 by pinching.
  • a strapping attached to at least a part of the periphery of the frame 10 is applied.
  • a frame 10 provided with a frame extending through the opening to allow a support of the filter screen 26
  • Such a frame then makes it possible to support the filtering screen 26 and to prevent its deterioration, even when a large force is exerted on it.
  • a large force may result from too much air flow and / or result from partial clogging of the mesh, rain or a person inadvertently pressing the grid.
  • the grid 12 has several small openings.
  • the dimensions of the openings are standardized in size, so that it is possible to equip separate grids sieves identical size depending on the need for filtration. This makes it possible to reduce the cost of manufacturing such a grid.
  • the manufacture of the material constituting the sieve 26 is simple and inexpensive.
  • the grid device according to the invention has the advantage of reducing manufacturing costs by reducing the storage space required.
  • the cutting of the sieve 26 in the form of the grid 12 is simple and inexpensive, and the storage of sieves 26 cut is also compact. All this also reduces both manufacturing and logistics costs.
  • the grid device according to the invention also has the advantage of being easily transversal to a range of vehicles, because it is easily adaptable to vehicles of different types, without significant modification of the tools. This is particularly easy in the case of the embodiment in which the grid has several small openings closed by sieves of standardized size.
  • the grid device according to the invention is also light and has a small overall thickness.
  • the grid 12 is an awning grid but it could be another type of external grid of the vehicle such as for example: a front air intake (central grid), a plug of side air, a rear air intake at the bottom.
  • the grid 12 could also be located at the entrance of a vehicle heating and air conditioning device, known as the HVAC device, which stands for Heating and Ventilation Air Conditioning, in addition to the cabin air filter. located upstream or inside the HVAC itself.
  • HVAC device which stands for Heating and Ventilation Air Conditioning

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The invention relates to a grille device (12) of a motor vehicle (100) for allowing air to enter the vehicle, comprising a frame (10) defining at least one opening (22) and a filtering sieve (26) covering the opening (22) and connected to the frame (10), characterised in that the filtering sieve (26) comprises a pleated section in which the pleats extend in at least one direction such as to increase the air flow distribution surface relative to the surface of the opening section.

Description

DISPOSITIF DE GRILLE D'AUVENT DE FILTRAGE AIR  AIR FILTER AWNING AWNING GRID DEVICE
L'invention concerne un dispositif de grille de véhicule automobile, et plus particulièrement un dispositif de grille d'auvent de véhicule automobile comportant un cadre délimitant au moins une ouverture et un tamis de filtration recouvrant l'ouverture et lié au cadre. The invention relates to a motor vehicle grille device, and more particularly to a motor vehicle awning grille device comprising a frame delimiting at least one opening and a filtering screen covering the opening and connected to the frame.
Les véhicules automobiles sont pourvus de dispositifs de ventilation et de climatisation afin de renouveler l'air ambiant dans l'habitacle. L'entrée d'air de ces dispositifs comporte une grille d'auvent afin d'éviter l'entrée de corps étrangers, tels que des sables, poussières, feuilles etc .. qui pourraient venir s'accumuler dans des conduits et détériorer les composants en aval du flux d'air tels que le pulseur d'un dispositif de ventilation et de climatisation connu sous le nom de dispositif HVAC, acronyme anglais pour Heating and Ventilation Air Conditionner ou en obstruer ses filtres disposés plus en aval, tel le filtre de traitement d'air de l'habitacle, comprenant un composé de type média filtrant et provoquer des bruyances ou des pertes de charge dommageables pour le confort des occupants du véhicule qui ont pris place dans l'habitacle.  Motor vehicles are equipped with ventilation and air conditioning devices to renew the ambient air in the passenger compartment. The air inlet of these devices has an awning grid to prevent the entry of foreign bodies, such as sands, dust, leaves etc .. that could come accumulate in ducts and damage components downstream of the air flow such as the blower of a ventilation and air conditioning device known as HVAC device, acronym for Heating and Ventilation Air Conditioning or clogging its filters arranged further downstream, such as the filter of air treatment of the passenger compartment, comprising a compound of filter media type and cause noise or loss of load damaging to the comfort of the occupants of the vehicle that took place in the passenger compartment.
Une solution pourrait être de placer le filtre de traitement d'air de l'habitacle en amont du dispositif HVAC, mais une telle architecture n'est pas toujours réalisable et pose des problèmes techniques: le filtre composé de média filtrant, destiné à traiter l'air pour l'occupant se colmate vite en entrée d'air, ne permet pas un débit suffisant pour l'entrée d'air et il faut pouvoir le changer ce qui n'est pas toujours possible car difficile d'accès en entrée d'air ou en amont de dispositif HVAC. Le plus souvent ces filtres de traitement de l'air de l'habitacle sont placés à l'intérieur du dispositif HVAC, entre le pulseur et l'évaporateur, de façon à ce que ceux-ci se colmatent moins vite et puissent être changés facilement. Dans ce cas, rien n'est prévu pour protéger en amont le dispositif pulseur.  One solution could be to place the cabin air treatment filter upstream of the HVAC device, but such an architecture is not always feasible and poses technical problems: the filter composed of filtering media, intended to treat the air for the occupant clogs quickly in the air intake, does not allow a sufficient flow for the air intake and it must be able to change it which is not always possible because difficult access to the entrance of air or upstream of HVAC device. Most often these cabin air treatment filters are placed inside the HVAC device, between the blower and the evaporator, so that they collapse less quickly and can be changed easily. . In this case, nothing is provided to protect the blower device upstream.
L'invention est destinée à procurer une protection en amont du dispositif pulseur lorsque notamment le filtre de traitement d'air de l'habitacle est placé à l'intérieur du dispositif HVAC. Cette protection est destinée à être placée à demeure dans le véhicule. Il n'est pas prévu de rechange comme c'est le cas dans le filtre habitacle équipé de média filtrant. The invention is intended to provide protection upstream of the blower device when in particular the air treatment filter of the cabin is placed inside the HVAC device. This protection is intended to be placed at stay in the vehicle. There is no provision for replacement as is the case in the cabin filter equipped with filter media.
Une solution pour limiter l'entrée de corps étrangers consiste à réduire les dimensions des mailles de la grille d'auvent afin de réduire le passage de corps étrangers au travers de la grille jusqu'à limiter voire supprimer le passage des poussières, comme il est décrit par exemple dans la demande de brevet déposée par la demanderesse FR0753274.  One solution to limit the entry of foreign bodies is to reduce the mesh size of the cowl grille to reduce the passage of foreign bodies through the grid to limit or even eliminate the passage of dust, as it is described for example in the patent application filed by the applicant FR0753274.
Cependant, la réduction des dimensions du maillage entraine une perte de charge au niveau de cette grille extérieure, ce qui limite les performances du dispositif de ventilation et de climatisation.  However, reducing the size of the mesh causes a loss of load at the outer grid, which limits the performance of the ventilation and air conditioning device.
Afin de pallier ces inconvénients, l'invention a pour objet un dispositif de grille de véhicule automobile qui présente des qualités de filtration améliorées et une perte de charge réduite et dont la fabrication est simple et peu onéreuse.  To overcome these drawbacks, the invention relates to a motor vehicle grille device which has improved filtration qualities and a reduced pressure drop and whose manufacture is simple and inexpensive.
A cette effet, l'invention propose un dispositif de grille destiné à permettre l'entrée d'air à l'intérieur du véhicule, comportant un cadre délimitant au moins une ouverture et un tamis de filtration recouvrant l'ouverture et lié au cadre, le tamis de filtration comportant un plissage dont les plis s'étendent selon au moins une direction pour augmenter la surface de répartition du flux d'air par rapport à la surface de section de l'ouverture.  For this purpose, the invention proposes a grid device intended to allow the entry of air inside the vehicle, comprising a frame delimiting at least one opening and a filtering screen covering the opening and connected to the frame, the filtration screen comprising a pleating whose folds extend in at least one direction to increase the distribution area of the air flow relative to the sectional area of the opening.
L'invention permet ainsi d'améliorer la filtration grossière en amont en permettant l'arrêt des grosses particules susceptibles à terme de provoquer l'endommagement du pulseur ou de l'évaporateur du dispositif HVAC. L'invention ne permet pas de filtrer l'air de l'habitacle pour la sécurité des occupants, mais seulement de protéger en amont les dispositifs techniques qui peuvent subir de forts dommages dans les pays ou l'air contient de fortes quantités de poussières en suspension.  The invention thus makes it possible to improve coarse filtration upstream by allowing large particles to be stopped, which may eventually cause damage to the blower or evaporator of the HVAC device. The invention does not make it possible to filter the air of the passenger compartment for the safety of the occupants, but only to protect upstream the technical devices which can undergo heavy damage in the countries where the air contains large quantities of dust in suspension.
On peut faire en sorte que le tamis de filtration comporte aux abords de sa périphérie, des zones destinées à se lier au cadre où le plissage est réduit ou absent de sorte à améliorer la liaison du tamis de filtration sur le cadre, ce qui augmente la facilité de fabrication et réduit le taux de rébus. On peut également faire en sorte que le tamis de filtration soit lié au cadre par des moyens de fixation choisis parmi des agrafes, des pions, des clips ou par un procédé choisi parmi une soudure ou un collage, ce qui permet une fabrication particulièrement économique et simple. The filter screen may be provided with areas around its periphery to bond to the frame where the pleating is reduced or absent so as to improve the connection of the filter screen to the frame, thereby increasing the ease of manufacture and reduces the rate of rebus. It is also possible to ensure that the filtering screen is bonded to the frame by fastening means chosen from staples, pins, clips or by a method chosen from a weld or a glue, which allows a particularly economical production and simple.
On peut faire en sorte que le dispositif comporte en outre un cerclage prévu pour se fixer sur au moins une partie de la périphérie du cadre de sorte à ce que les zones du tamis destinées à se lier au cadre soient pincées entre le cadre et le cerclage, ce qui augmente la robustesse du dispositif en répartissant l'effort de la liaison entre le tamis et le cadre sur une surface étendue.  It can be arranged that the device further comprises a strapping provided to be fixed on at least a part of the periphery of the frame so that the areas of the sieve intended to bind to the frame are pinched between the frame and the strapping. , which increases the strength of the device by distributing the force of the connection between the screen and the frame over an extended area.
En outre, le tamis de filtration peut être fabriqué à partir d'un matériau permettant de réaliser un plissage par un procédé de thermoformage, ce qui permet de se passer de pièces d'attache.  In addition, the filter screen may be made from a material for pleating by a thermoforming process, which makes it unnecessary to attach parts.
On peut faire en sorte que le tamis de filtration présente une dimension de maille comprise entre 0,5 mm et 7 mm et de préférence comprise entre 2 mm et 7 mm, ce qui permet de combiner une capacité de filtration élevée et une perte de charge réduite.  It is possible to ensure that the filter screen has a mesh size of between 0.5 mm and 7 mm and preferably of between 2 mm and 7 mm, which makes it possible to combine a high filtration capacity and a pressure drop. scaled down.
On peut faire en sorte que les plis du plissage présentent une hauteur Hp comprise entre 0,3 cm et 1 ,5 cm.  It can be ensured that the pleating folds have a height Hp of between 0.3 cm and 1.5 cm.
De même, les plis peuvent présenter un pas du pli Pp compris entre 0,3 cm et 0,8 cm.  Similarly, the folds may have a pitch Pp between 0.3 cm and 0.8 cm.
On peut faire en sorte que le cadre comporte un châssis s'étendant à travers l'ouverture pour permettre un support du tamis de filtration, ce qui permet de réduire le risque de détérioration du tamis par des éléments extérieurs.  The frame can be made to have a frame extending through the opening to allow filter screen support, thereby reducing the risk of sieve deterioration by external elements.
On peut également faire en sorte le tamis de filtration comporte un composé à charbon actif, pour offrir des capacités additives de traitement de l'air au filtre.  One can also make sure the filter screen includes an active carbon compound, to provide additive air treatment capabilities to the filter.
Enfin, l'invention concerne aussi un véhicule comprenant un dispositif de filtration d'air de l'habitacle disposé à l'intérieur du dispositif HVAC, et un dispositif de grille destiné à permettre l'entrée d'air à l'intérieur du véhicule présentant les caractéristiques divulguées précédemment. Finally, the invention also relates to a vehicle comprising an air filtration device of the passenger compartment disposed inside the HVAC device, and a grid device intended to allow the entry of air inside the vehicle having the characteristics disclosed above.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description d'exemples de réalisation d'un dispositif de grille d'auvent de véhicule automobile en référence aux dessins annexés dans lesquels : Other features and advantages of the invention will appear on reading the description of exemplary embodiments of a motor vehicle awning grille device with reference to the appended drawings in which:
- La figure 1 est une vue en perspective d'un véhicule comportant un dispositif de grille d'auvent selon l'invention.  - Figure 1 is a perspective view of a vehicle comprising a canopy grille device according to the invention.
- La figure 2 est une vue de dessus de la grille d'auvent seule.  - Figure 2 is a top view of the canopy grill alone.
- La figure 3 est une vue de la coupe 3-3 de la grille d'auvent de la figure FIG. 3 is a view of section 3-3 of the awning grid of FIG.
2. 2.
- La figure 4 est une vue schématique en perspective de la périphérie de la grille d'auvent.  - Figure 4 is a schematic perspective view of the periphery of the awning grid.
Dans la description qui suit, nous prendrons à titre non limitatif une orientation longitudinale, verticale et transversale indiquée par le trièdre L,V,T des figures 2 à 4.  In the following description, we will take non-limiting longitudinal orientation, vertical and transverse indicated by the trihedron L, V, T of Figures 2 to 4.
Tel que représenté à la figure 1 , un véhicule 100 comporte une grille extérieure 12.  As represented in FIG. 1, a vehicle 100 comprises an external grid 12.
Dans l'exemple décrit ici, la grille d'auvent 12 est une pièce plastique s'étendant selon une direction transversale entre un pare-brise 14 et un capot 16 du véhicule 100 et recouvrant une boîte à eau (non représentée) dudit véhicule 100. Ce type de grille est communément appelé « grille d'auvent » et est destiné à permettre l'entrée d'air à l'intérieur du véhicule, via le dispositif de climatisation et de ventilation.  In the example described here, the awning grid 12 is a plastic part extending in a transverse direction between a windshield 14 and a cover 16 of the vehicle 100 and covering a water box (not shown) of said vehicle 100 This type of grid is commonly called "awning grid" and is intended to allow the entry of air inside the vehicle, via the air conditioning and ventilation device.
Tel que représenté à la figure 2, la grille d'auvent 12 comporte un cadre 10 destiné à être fixé sur des éléments (non représentés) du véhicule 100, par vissage ou clippage par exemple. Ce cadre 10 délimite une ouverture 22 matérialisant l'entrée d'air d'habitacle. Pour permettre un filtrage de l'air entrant dans le véhicule 100, l'ouverture 22 est recouverte par un tamis de filtration 26. As shown in Figure 2, the awning grid 12 comprises a frame 10 intended to be fixed on elements (not shown) of the vehicle 100, by screwing or clipping for example. This frame 10 defines an opening 22 embodying the cabin air inlet. To allow filtering of the air entering the vehicle 100, the opening 22 is covered by a filter screen 26.
Le tamis de filtration 26 présente un maillage formé de trous sensiblement circulaires, pouvant présenter par exemple une taille de 0,5 millimètres à 7 millimètres et préférentiellement une taille comprise entre 2 millimètres à 7 millimètres. La taille des trous dépend de l'aspect souhaité pour la grille d'auvent 12, des contraintes liées au débit d'air souhaité pour ventiler l'habitacle mais aussi de la géométrie des corps étrangers ciblés, principalement leur diamètre minimum. Le tamis de filtration est une pièce destinée à être fixée à demeure dans le véhicule, il ne constitue pas une pièce d'usure, que l'on change au bout d'un certain temps de roulage, comme c'est la cas par exemple, spécifiquement pour les filtres de type « mediafiltrant » appartenant au système HVAC. Il n'est pas destiné à protéger l'occupant, en filtrant les fines particules comme c'est le cas pour les filtres mediafiltrant. Sa fonction est d'assurer une filtration en entrée d'air afin de protéger le matériel pulseur notamment du système HVAC.  The filtration screen 26 has a mesh formed of substantially circular holes, which may for example have a size of 0.5 millimeters to 7 millimeters and preferably a size of between 2 millimeters to 7 millimeters. The size of the holes depends on the appearance desired for the awning grid 12, constraints related to the air flow desired to ventilate the passenger compartment but also the geometry of the foreign objects targeted, mainly their minimum diameter. The filtration screen is a part intended to be permanently fixed in the vehicle, it does not constitute a wear part, which is changed after a certain rolling time, as is the case for example , specifically for the "mediafiltrant" filters belonging to the HVAC system. It is not intended to protect the occupant by filtering fine particles as is the case for media filter filters. Its function is to ensure filtration at the air intake to protect the blower material including the HVAC system.
Alternativement, d'autres types de maillage peuvent être utilisés, notamment des maillages formés d'autres formes géométriques, telles des trous carrés ou des trous oblonds.  Alternatively, other types of mesh may be used, including meshes formed from other geometric shapes, such as square holes or oblong holes.
Pour améliorer les capacités de filtration de la grille d'auvent 12, ce tamis de filtration 26 présente un plissage, comme représenté à la figure 3. Grâce à ce plissage, la perte de charge à débit d'air donné de ce tamis de filtration 26 par rapport à un tamis de filtration de l'état de la technique, comme celui décrit dans le document de brevet FR0753274, peut être maintenue constante tout en augmentant la finesse du maillage, ou autrement dit en réduisant les dimensions ou bien l'épaisseur des mailles, du tamis de filtration 26. En effet, la surface utile, c'est-à-dire la surface de tamis de filtration 26 effectivement traversée par l'air augmente en raison du plissage, ce qui permet d'augmenter la finesse du maillage, en conservant une perte de charge équivalente du fait de l'abaissement de la vitesse moyenne de l'air. Autrement dit, le plissage permet d'avoir une surface utile du tamis de filtration 26 supérieure à la surface de l'ouverture 22. To improve the filtration capacity of the awning grid 12, this filtering screen 26 has a pleating, as shown in FIG. 3. Thanks to this pleating, the given airflow pressure drop of this filtration screen 26 with respect to a filtering filter of the state of the art, such as that described in patent document FR0753274, can be kept constant while increasing the fineness of the mesh, or in other words by reducing the dimensions or the thickness In fact, the effective area, that is to say the surface of filtration screen 26 actually traversed by the air increases due to the pleating, which allows to increase the smoothness. mesh, maintaining a loss of equivalent load due to the lowering of the average air speed. In other words, pleating allows to have a useful surface of the filtration screen 26 greater than the surface of the opening 22.
Avantageusement, le tamis de filtration 26 est fabriqué à partir d'un matériau permettant de réaliser un plissage par un procédé de thermoformage.  Advantageously, the filtering sieve 26 is made from a material that makes it possible to pleat by a thermoforming process.
Le tamis 26 est une pièce en matière plastique souple de type polypropylène.  The sieve 26 is a flexible plastic part of the polypropylene type.
Le tamis 26 peut subir un traitement de surface permettant d'augmenter ses qualités de résistance aux intempéries, aux rayons U.V. et au vieillissement. En outre, le tamis de filtration 26 comporte un composé à charbon actif.  The sieve 26 may undergo a surface treatment to increase its weather resistance, U.V. and aging resistance qualities. In addition, the filter screen 26 comprises an activated carbon compound.
La figure 3 laisse apparaître le profil des plis de ce plissage dans un plan de section perpendiculaire au flux d'écoulement de l'air au travers de l'ouverture 22, soit sur la figure 3 dans le plan L-T.  Figure 3 shows the profile of the folds of this pleating in a cross sectional plane perpendicular to the flow of air through the opening 22, or in Figure 3 in the plane L-T.
La hauteur Hp des plis, prise crête-à-crête, est comprise entre 0,3cm et 1 ,5 cm.  The height Hp of the folds, taken peak-to-peak, is between 0.3 cm and 1, 5 cm.
Le pas du pli Pp, c'est-à-dire la distance entre deux crêtes pointant dans la même direction, soit vers le haut soit vers le bas, est compris entre 0,3cm et 0,8cm.  The pitch pitch Pp, that is to say the distance between two ridges pointing in the same direction, either upwards or downwards, is between 0.3 cm and 0.8 cm.
Le tamis de filtration 26 comporte aux abords de sa périphérie, des zones 26E destinées à se lier au cadre 10 où le plissage est réduit ou absent de sorte à améliorer la liaison du tamis de filtration 26 sur le cadre 10.  The filtering screen 26 comprises, around its periphery, zones 26E intended to be bonded to the frame 10 where the pleating is reduced or absent so as to improve the connection of the filtering screen 26 to the frame 10.
Dans ces zones 26E situées aux abords de sa périphérie, le tamis 26 est lié au cadre par des moyens de fixation (non représentés) choisis parmi des agrafes, des pions ou des clips.  In these areas 26E located around its periphery, the screen 26 is connected to the frame by fastening means (not shown) selected from staples, pins or clips.
Avantageusement, on peut également prévoir que le tamis 26 est lié au cadre 10 par collage ou bien par un procédé de soudure.  Advantageously, it is also possible that the sieve 26 is bonded to the frame 10 by gluing or by a welding process.
Pour renforcer la liaison entre le tamis 26 et le cadre 10, les zones 26E situées aux abords de la périphérie du tamis 26 peuvent être plaquées contre le cadre 10 par pinçage. A cette fin, on applique un cerclage fixé sur au moins une partie de la périphérie du cadre 10. To reinforce the connection between the screen 26 and the frame 10, the zones 26E located around the periphery of the sieve 26 can be pressed against the frame 10 by pinching. To this end, a strapping attached to at least a part of the periphery of the frame 10 is applied.
Selon un mode particulier de réalisation spécialement adapté à la réalisation de grille 12 dont l'ouverture présente des dimensions importantes, on prévoit un cadre 10 pourvu d'un châssis s'étendant à travers l'ouverture pour permettre un support du tamis de filtration 26. Un tel châssis permet alors de soutenir le tamis de filtration 26 et d'éviter sa détérioration, même lorsqu'une force importante s'exerce sur celui-ci. Une force importante peut résulter d'un débit d'air trop important et/ou résulter d'un colmatage partiel des mailles, de la pluie ou d'une personne ayant appuyé sur la grille par inadvertance.  According to a particular embodiment specifically adapted to the realization of grid 12 whose opening has significant dimensions, there is provided a frame 10 provided with a frame extending through the opening to allow a support of the filter screen 26 Such a frame then makes it possible to support the filtering screen 26 and to prevent its deterioration, even when a large force is exerted on it. A large force may result from too much air flow and / or result from partial clogging of the mesh, rain or a person inadvertently pressing the grid.
Selon un autre mode de réalisation, la grille 12 présente plusieurs ouvertures de taille réduite. Avantageusement, les dimensions des ouvertures sont de taille standardisée, de sorte qu'il est possible d'équiper des grilles distinctes de tamis de dimension identiques en fonction du besoin de filtration. On rend ainsi possible une baisse du coût de fabrication d'une telle grille.  According to another embodiment, the grid 12 has several small openings. Advantageously, the dimensions of the openings are standardized in size, so that it is possible to equip separate grids sieves identical size depending on the need for filtration. This makes it possible to reduce the cost of manufacturing such a grid.
Selon un premier avantage de l'invention, la fabrication du matériau constituant le tamis 26 est simple et peu onéreuse. According to a first advantage of the invention, the manufacture of the material constituting the sieve 26 is simple and inexpensive.
D'autre part, le matériau mis en forme constituant le tamis 26 étant livré sous forme de rouleaux, le dispositif de grille selon l'invention présente l'avantage de réduire les coûts de fabrication en diminuant l'espace de stockage nécessaire.  On the other hand, the shaped material constituting the sieve 26 being delivered in the form of rolls, the grid device according to the invention has the advantage of reducing manufacturing costs by reducing the storage space required.
Par ailleurs, la découpe du tamis 26 à la forme de la grille 12 est simple et peu coûteuse, et le stockage des tamis 26 découpés est également peu encombrant. Tout ceci permet aussi de réduire à la fois les coûts de fabrication et de logistique.  Moreover, the cutting of the sieve 26 in the form of the grid 12 is simple and inexpensive, and the storage of sieves 26 cut is also compact. All this also reduces both manufacturing and logistics costs.
Le dispositif de grille selon l'invention présente de plus l'avantage de pouvoir être facilement transversalisé à toute une gamme de véhicules, car il est facilement adaptable à des véhicules de type différent, sans modification importante des outillages. Ceci est particulièrement aisé dans le cas du mode de réalisation dans lequel la grille présente plusieurs ouvertures de taille réduite obturés par des tamis de taille standardisée. The grid device according to the invention also has the advantage of being easily transversal to a range of vehicles, because it is easily adaptable to vehicles of different types, without significant modification of the tools. This is particularly easy in the case of the embodiment in which the grid has several small openings closed by sieves of standardized size.
Le dispositif de grille selon l'invention est également léger et présente un faible encombrement en épaisseur.  The grid device according to the invention is also light and has a small overall thickness.
Dans le cas décrit, ici la grille 12 est une grille d'auvent mais il pourrait s'agir d'un autre type de grille extérieure du véhicule comme par exemple : une prise d'air frontale (grille centrale), une prise d'air latérale, une prise d'air arrière en partie basse.  In the case described, here the grid 12 is an awning grid but it could be another type of external grid of the vehicle such as for example: a front air intake (central grid), a plug of side air, a rear air intake at the bottom.
La grille 12 pourrait également être située à l'entrée d'un dispositif de chauffage et de climatisation de véhicule, connu sous le nom de dispositif HVAC, acronyme anglais pour Heating and Ventilation Air Conditionner, en complément du filtre à air d'habitacle généralement implanté en amont ou à l'intérieur du HVAC lui-même.  The grid 12 could also be located at the entrance of a vehicle heating and air conditioning device, known as the HVAC device, which stands for Heating and Ventilation Air Conditioning, in addition to the cabin air filter. located upstream or inside the HVAC itself.

Claims

REVENDICATIONS
1 ) Dispositif de grille (12) de véhicule automobile (100) destiné à permettre l'entrée d'air à l'intérieur du véhicule comportant un cadre (10) délimitant au moins une ouverture (22) et un tamis de filtration (26) recouvrant l'ouverture (22) et lié au cadre (10) caractérisé en ce que le tamis de filtration (26) comporte un plissage dont les plis s'étendent selon au moins une direction pour augmenter la surface de répartition du flux d'air par rapport à la surface de section de l'ouverture. Motor vehicle grille device (12) (100) intended to allow the entry of air into the interior of the vehicle comprising a frame (10) delimiting at least one opening (22) and a filter screen (26). ) covering the opening (22) and connected to the frame (10) characterized in that the filtering screen (26) comprises a pleating whose folds extend in at least one direction to increase the distribution area of the flow of air relative to the sectional area of the opening.
2) Dispositif de grille (12) selon la revendication précédente, caractérisé en ce que le tamis de filtration (26) comporte aux abords de sa périphérie, des zones (26E) destinées à se lier au cadre (10) où le plissage est réduit ou absent de sorte à améliorer la liaison du tamis de filtration (26) sur le cadre (10). 2) Grid device (12) according to the preceding claim, characterized in that the filtering screen (26) has in the vicinity of its periphery, zones (26E) for binding to the frame (10) where the pleating is reduced or absent so as to improve the connection of the filter screen (26) to the frame (10).
3) Dispositif de grille (12) selon l'une des revendications précédentes, caractérisé en ce que le tamis de filtration (26) est lié au cadre (10) par des moyens de fixation choisis parmi des agrafes, des pions, des clips ou par un procédé choisi parmi une soudure ou un collage. 3) Grid device (12) according to one of the preceding claims, characterized in that the filter screen (26) is connected to the frame (10) by fastening means selected from staples, pins, clips or by a method selected from welding or gluing.
4) Dispositif de grille (12) selon l'une des revendications précédentes, caractérisé en ce qu'il comporte en outre un cerclage prévu pour se fixer sur au moins une partie de la périphérie du cadre (10) de sorte à ce que les zones (26E) du tamis (26) destinées à se lier au cadre (10) soient pincées entre le cadre (10) et le cerclage.  4) Grid device (12) according to one of the preceding claims, characterized in that it further comprises a strapping provided to be fixed on at least a portion of the periphery of the frame (10) so that the areas (26E) of the screen (26) for binding to the frame (10) are clamped between the frame (10) and the strapping.
5) Dispositif de grille (12) selon l'une des revendications précédentes, caractérisé en ce que le tamis de filtration (26) est fabriqué à partir d'un matériau permettant de réaliser un plissage par un procédé de thermoformage.  5) Grid device (12) according to one of the preceding claims, characterized in that the filter screen (26) is made from a material for performing a pleating by a thermoforming process.
6) Dispositif de grille (12) selon l'une des revendications précédentes caractérisé en ce que le tamis de filtration (26) présente une dimension - io de maille comprise entre 0,5 mm et 7 mm et de préférence comprise entre 2 mm et 7 mm. 6) Grid device (12) according to one of the preceding claims characterized in that the filter screen (26) has a dimension mesh size of between 0.5 mm and 7 mm and preferably between 2 mm and 7 mm.
7) Dispositif de grille (12) selon l'une des revendications précédentes, caractérisé en ce que les plis du plissage présentent une hauteur (Hp) comprise entre 0,3 cm et 1 ,5 cm.  7) Grid device (12) according to one of the preceding claims, characterized in that the pleating folds have a height (Hp) of between 0.3 cm and 1.5 cm.
8) Dispositif de grille (12) selon l'une des revendications précédentes, caractérisé en ce que le pas du pli (Pp) est compris entre 0,3 cm et 0,8 cm.  8) grid device (12) according to one of the preceding claims, characterized in that the pitch of the fold (Pp) is between 0.3 cm and 0.8 cm.
9) Dispositif de grille (12) selon l'une des revendications précédentes, caractérisé en ce que le cadre (10) comporte un châssis s'étendant à travers l'ouverture pour permettre un support du tamis de filtration (26). 9) grate device (12) according to one of the preceding claims, characterized in that the frame (10) comprises a frame extending through the opening to allow a support of the filter screen (26).
10) Dispositif de grille (12) selon l'une des revendications précédentes, caractérisé en ce que le tamis de filtration (26) comporte un composé à charbon actif. 10) grate device (12) according to one of the preceding claims, characterized in that the filter screen (26) comprises an active carbon compound.
1 1 ) Véhicule comprenant un dispositif de filtration d'air habitacle à l'intérieur du dispositif HVAC et un dispositif de grille destiné à permettre l'entrée d'air à l'intérieur du véhicule selon l'une quelconque des revendications précédentes.  1 1) Vehicle comprising a cabin air filtration device inside the HVAC device and a grid device for allowing the entry of air inside the vehicle according to any one of the preceding claims.
PCT/FR2010/052687 2009-12-15 2010-12-13 Cowl vent grille device for filtering air WO2011073555A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0959000A FR2953796A1 (en) 2009-12-15 2009-12-15 AUTOMOTIVE VEHICLE GRID DEVICE
FR0959000 2009-12-15

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WO2011073555A1 true WO2011073555A1 (en) 2011-06-23

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FR (1) FR2953796A1 (en)
WO (1) WO2011073555A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR753274A (en) 1932-03-30 1933-10-12 Stotz Kontakt Gmbh Automatic switch or installation maximum circuit breaker, with push-button control
FR2806320A1 (en) * 2000-03-15 2001-09-21 Valeo Filter assembly for motor vehicle ventilation, heating or air conditioning system has frame side walls shaped to match edges of filter
FR2806318A1 (en) * 2000-03-15 2001-09-21 Valeo FILTRATION DEVICE FOR FITTING A VENTILATION AND / OR HEATING AND / OR AIR CONDITIONING APPARATUS, PARTICULARLY FOR A MOTOR VEHICLE
FR2833858A1 (en) * 2001-12-21 2003-06-27 Valeo Motor vehicle air filter has frame that can be bent into concave and convex shapes with stops to limit its movement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5989303A (en) * 1996-08-19 1999-11-23 Hodge; Joseph Fan-fold filter for a forced air ventilation system
US7169202B2 (en) * 2003-12-24 2007-01-30 3M Innovative Properties Company Filter assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR753274A (en) 1932-03-30 1933-10-12 Stotz Kontakt Gmbh Automatic switch or installation maximum circuit breaker, with push-button control
FR2806320A1 (en) * 2000-03-15 2001-09-21 Valeo Filter assembly for motor vehicle ventilation, heating or air conditioning system has frame side walls shaped to match edges of filter
FR2806318A1 (en) * 2000-03-15 2001-09-21 Valeo FILTRATION DEVICE FOR FITTING A VENTILATION AND / OR HEATING AND / OR AIR CONDITIONING APPARATUS, PARTICULARLY FOR A MOTOR VEHICLE
FR2833858A1 (en) * 2001-12-21 2003-06-27 Valeo Motor vehicle air filter has frame that can be bent into concave and convex shapes with stops to limit its movement

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