EP1701084B1 - Box structure for linking between horizontal and vertical ducts of a mechanical ventilation installation of a building - Google Patents

Box structure for linking between horizontal and vertical ducts of a mechanical ventilation installation of a building Download PDF

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Publication number
EP1701084B1
EP1701084B1 EP06356006.4A EP06356006A EP1701084B1 EP 1701084 B1 EP1701084 B1 EP 1701084B1 EP 06356006 A EP06356006 A EP 06356006A EP 1701084 B1 EP1701084 B1 EP 1701084B1
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EP
European Patent Office
Prior art keywords
box structure
perforated plate
opening
insulating material
horizontal
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EP06356006.4A
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German (de)
French (fr)
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EP1701084A1 (en
Inventor
Serge Buseyne
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Aldes Aeraulique SA
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Aldes Aeraulique SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/0263—Insulation for air ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F2007/001—Ventilation with exhausting air ducts
    • F24F2007/002—Junction box, e.g. for ducts from kitchen, toilet or bathroom

Definitions

  • the present invention relates to a connecting box between horizontal and vertical ducts of a controlled mechanical ventilation installation of a building.
  • VMC installations Collective or individual dwellings, private or industrial premises are generally equipped with controlled mechanical ventilation systems, commonly known as VMC installations, to ensure a minimum of air renewal, necessary for hygiene, quality air and the durability of buildings.
  • a VMC installation generally consists of a ventilation group, a horizontal collector system or terrace, and at least one vertical network serving the various rooms to ventilate.
  • the accessory for connecting a vertical duct to a horizontal duct consists of a generally cylindrical metal casing into which the vertical duct and the horizontal duct radially open.
  • a box is called attic or terrace quill box (CPC or CPT) and also commonly called tee strain.
  • a ventilation system is sized to meet the regulatory requirements for extracted flows, acoustics and acoustic transmission between dwellings.
  • the network is then designed and dimensioned to ensure regulatory flows in relation to the conditions required by the acoustic regulation of construction.
  • the noise transmitted in the room served is a function of the characteristics of the extractor and its operating regime, the acoustic attenuation of the network, and the characteristics of the extraction vents.
  • the average air velocity in ducts must not exceed 6 ms -1 in horizontal ducts and 5 ms -1 in vertical ducts.
  • the decking box of terrace or roof has an important role in obtaining the resulting sound level and the resulting extracted flows.
  • a disadvantage of the wells of current manufacture is that they transmit a significant noise from the ventilation unit to the extraction vents located in the apartments, through the metal conduits.
  • the box has a major influence in the design of the fan and its consumption.
  • High pressure drops have the consequence of increasing the cost of installation and use.
  • Another use is to replace the box with a bend, resulting in a reduction of the pressure drop, a better dimensioning of the horizontal network but the impossibility to check the vacuity of the vertical networks and thus making the installation not in conformity with the regulations .
  • the box also has an important role for the maintenance of the facilities, its implementation to allow verification of the vacuity of the vertical duct.
  • the boxes are generally equipped with a removable cover allowing periodic visits and cleaning of ducts but also, in accordance with the regulatory requirements, to ensure the protection of the waterproofing report.
  • the document FR 2,624,580 discloses a junction box according to the preamble of claim 1.
  • the present invention therefore aims to remedy these drawbacks.
  • the technical problem underlying the invention is the production of a connecting box between horizontal and vertical ducts of a controlled mechanical ventilation system of a building to limit its pressure losses, while ensuring attenuation. sufficient acoustics of the ventilation system and allowing maintenance and verification of the void of the vertical ducts.
  • the invention relates to a connecting box between horizontal and vertical ducts of a controlled mechanical ventilation installation of a building, of the type comprising a hollow body having a lower opening intended to be connected to a vertical duct, an upper opening provided with a closure lid, the side wall of the hollow body having at least one lateral opening for mounting a connecting duct with a ventilation unit, characterized in that it is equipped with deflection means removable members for directing a flow of incoming air through the lower opening or the lateral opening, to the lateral opening or the lower opening respectively, the deflection means being acoustically absorbent, and in that the deflection means comprise a curved perforated plate, whose convex face is turned towards the closure lid and covered, on its turned side towards the cover, a layer of acoustic insulating material.
  • the deflection means direct the flow of air entering the box towards the connecting duct with the ventilation unit, thus allowing a significant reduction in pressure losses inside. of the box and therefore a better dimensioning of the fan and a saving of consumption.
  • the deflection means are also acoustically absorbing, it is possible to attenuate the incident noise and thus to obtain a regulatory sound level.
  • the upper edge of the perforated plate is located at the upper part of the lateral opening, and the lower edge of the perforated plate is located at the portion of the lower opening, located on the side opposite the lateral opening.
  • At least two perforations formed on the perforated plate have different diameters.
  • the perforations of different diameters formed on the perforated plate are distributed randomly.
  • the perforated plate is equipped with means for retaining the layer of insulating material.
  • the perforated plate is metallic.
  • the layer of acoustic insulating material is made of glass wool or rock, compressed felt, or the like.
  • the hollow body is of cylindrical general shape, of axis corresponding to that of the lower opening.
  • Figure 1 is a very schematic view of a ventilation system equipped with the box according to the invention.
  • Figure 2 is a longitudinal sectional view of the box according to the invention.
  • Figure 3 is a top view of the box without its closure lid.
  • Figure 4 is a perspective view of the deflection means according to the invention.
  • the figure 1 very schematically represents a controlled mechanical ventilation installation of a multi-storey building operating in extraction.
  • the floors of each floor are designated by the reference 2, and the floor of the roof terrace is designated by the reference 3.
  • All air extraction vents 4, mounted in the rooms of the various rooms to be ventilated, are associated with a metal column vertical 5, which is connected via a terrace branch box 6 to a horizontal pipe 7 in communication with the ventilation group 8 located on the terrace.
  • the casing 6 comprises a cylindrical metal body 9, of vertical axis, in which are provided a lower air inlet opening 10, of the same axis as the casing 6, in communication with the vertical duct 5, an upper opening 12 closed by a cover 13 and a radial opening 14 of air outlet, equipped with a sleeve 15 for connection to the horizontal duct 7.
  • the casing 6 is also equipped with removable deflection means 16, 17.
  • the removable deflection means comprise a perforated metal plate bent 16 of generally rectangular shape, covered on its convex face facing the cover 13, a layer of acoustic insulating material 17 of dimensions substantially identical to those of the metal plate 16.
  • the perforated plate 16 is equipped with two retaining tabs 18 formed on its longitudinal edges, substantially at its upper edge 19, and a return 20 formed on its lower edge 21.
  • the retaining tabs 18 and the return 20 are turned inwardly on the side of the acoustic insulating material layer 17 and are intended to hold the latter on the perforated plate 16.
  • the layer of acoustic insulating material 17 may consist of, for example, glass wool or rock, compressed felt, or the like.
  • the metal plate 16 is bent, its convex face being turned towards the cover 13, the upper edge 19 of the metal plate 16 is located at the upper part of the radial opening 14 of air outlet and of complementary shape that of the side wall of the body 9 while the lower edge 21 of the perforated plate 16 bears against the lower wall of the box 6, at the portion of the lower air inlet opening 10, on the opposite side to the air outlet opening 14.
  • the perforated plate 16 and the acoustic insulating material 17 make it possible to direct the flow of air entering through the lower air intake opening 10 towards the radial opening 14 of the air inlet. air outlet connected to the horizontal duct 7 connected to the ventilation unit 8.
  • the perforated plate 16 delimits with the cover 13 and the body 9 a volume of air more or less filled with acoustic insulating material 17.
  • This is a Helmholtz resonator that absorbs a part of the incident sound waves and therefore of mitigate the incident noise.
  • the resonance frequency of a Helmholtz resonator depends on the density of the acoustic insulating material, the surface and the depth of the holes allowing air circulation in the resonator and the height of the air volume.
  • the acoustic insulating material 17 can only absorb a well-defined frequency range and the same is true for each perforation 22 formed on the metal plate 16.
  • each perforation 22 has the same diameter and the same surface, only a restricted range of frequencies can be absorbed.
  • each perforation 22 uses a portion of the air trapped between the plate 16, the body 9 and the cover 13, and forms a small Helmholtz resonator operating for a different frequency range, thus allowing a better attenuation of the incident noise.
  • the invention provides a great improvement to the existing technique, providing a connecting box between horizontal and vertical ventilation ducts, simple structure, and having excellent aeraulic properties and insulation acoustic.
  • the invention is not limited to an embodiment, described above by way of example, but that it encompasses all the variants of embodiment.
  • the hollow body 9 could be, for example, generally parallelepipedal in shape and that the controlled mechanical ventilation installation could operate in insufflation, in this case the flow of air enters through the radial opening 14 and is directed by the deflection means 16, 17 to the lower opening 10, without departing from the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Duct Arrangements (AREA)

Description

La présente invention concerne un caisson de liaison entre des conduits horizontaux et verticaux d'une installation de ventilation mécanique contrôlée d'un bâtiment.The present invention relates to a connecting box between horizontal and vertical ducts of a controlled mechanical ventilation installation of a building.

Les logements collectifs ou individuels, les locaux à usage privé ou industriel sont généralement équipés d'installations de ventilation mécanique contrôlée, communément appelées installations de VMC, afin d'assurer un minimum de renouvellement d'air, nécessaire pour l'hygiène, la qualité de l'air et la pérennité des bâtiments.Collective or individual dwellings, private or industrial premises are generally equipped with controlled mechanical ventilation systems, commonly known as VMC installations, to ensure a minimum of air renewal, necessary for hygiene, quality air and the durability of buildings.

Une installation de VMC est constituée généralement d'un groupe de ventilation, d'un réseau collecteur horizontal en comble ou en terrasse, et d'au moins un réseau vertical desservant les différentes pièces à ventiler.A VMC installation generally consists of a ventilation group, a horizontal collector system or terrace, and at least one vertical network serving the various rooms to ventilate.

L'accessoire permettant de relier un conduit vertical à un conduit horizontal est constitué d'un caisson métallique généralement cylindrique dans lequel débouche axialement le conduit vertical et radialement le conduit horizontal. Un tel caisson est appelé caisson de piquage de comble ou de terrasse (CPC ou CPT) et aussi communément appelé té souche.The accessory for connecting a vertical duct to a horizontal duct consists of a generally cylindrical metal casing into which the vertical duct and the horizontal duct radially open. Such a box is called attic or terrace quill box (CPC or CPT) and also commonly called tee strain.

Une installation de ventilation est dimensionnée de façon à satisfaire les exigences réglementaires en matière de débits extraits, d'acoustique et enfin de transmission acoustique entre les logements.A ventilation system is sized to meet the regulatory requirements for extracted flows, acoustics and acoustic transmission between dwellings.

Le réseau est alors conçu et dimensionné de façon à assurer les débits réglementaires par rapport aux conditions exigées par le règlement acoustique de la construction.The network is then designed and dimensioned to ensure regulatory flows in relation to the conditions required by the acoustic regulation of construction.

En ce qui concerne les débits extraits, un calcul de perte de charge des différents composants de l'installation est nécessaire pour s'assurer de l'obtention de débits réglementaires.With regard to the extracted flows, a calculation of the pressure drop of the various components of the installation is necessary to ensure the obtaining of regulatory flows.

En ce qui concerne l'acoustique, le bruit transmis dans la pièce desservie est fonction des caractéristiques de l'extracteur et de son régime de fonctionnement, de l'atténuation acoustique du réseau, et des caractéristiques des bouches d'extraction.With regard to acoustics, the noise transmitted in the room served is a function of the characteristics of the extractor and its operating regime, the acoustic attenuation of the network, and the characteristics of the extraction vents.

Pour respecter les conditions exigées par le règlement, il convient de respecter les exigences suivantes : la vitesse moyenne de l'air dans les conduits ne doit pas excéder 6 m.s-1 dans les conduits horizontaux et 5 m.s-1 dans les conduits verticaux. Ces limitations correspondent aux seules exigences acoustiques et ne peuvent tenir lieu de règle de dimensionnement en vue de l'obtention des débits extraits dans le réseau. Ces conditions imposées sont nécessaires mais pas suffisantes : il est alors nécessaire de calculer l'atténuation acoustique des différents composants de l'installation pour s'assurer de l'obtention d'un niveau sonore réglementaire.To comply with the requirements of the regulation, the following requirements must be met: the average air velocity in ducts must not exceed 6 ms -1 in horizontal ducts and 5 ms -1 in vertical ducts. These limitations correspond to the only acoustic requirements and can not take the place of sizing rule in order to obtain the extracted flows in the network. These imposed conditions are necessary but not sufficient: it is then necessary to calculate the acoustic attenuation of the various components of the installation to ensure that a prescribed sound level is achieved.

Le caisson de piquage de terrasse ou de comble a un rôle important dans l'obtention du niveau sonore résultant et des débits extraits résultants.The decking box of terrace or roof has an important role in obtaining the resulting sound level and the resulting extracted flows.

Un inconvénient des caissons de fabrication courante est qu'ils transmettent un bruit important depuis le groupe de ventilation jusqu'aux bouches d'extraction situées dans les appartements, par l'intermédiaires des conduits métalliques.A disadvantage of the wells of current manufacture is that they transmit a significant noise from the ventilation unit to the extraction vents located in the apartments, through the metal conduits.

Une solution pour remédier à cet inconvénient consiste à ajouter dans ces caissons un morceau compact de fibre minérale permettant d'améliorer les caractéristiques d'atténuations acoustiques du caisson. Le morceau compact de fibre minérale est généralement collé sous le couvercle du caisson.One solution to overcome this drawback is to add in these boxes a compact piece of mineral fiber to improve the acoustic attenuation characteristics of the box. The compact piece of mineral fiber is usually glued under the lid of the box.

Cependant, un soin particulier doit être pris pour éviter un défibrage dans le temps et donc une dégradation des performances dans le temps.However, special care must be taken to avoid defibration over time and therefore a degradation of performance over time.

Un autre inconvénient de ces caissons est que la perte de charge est très importante, elle est souvent au moins égale ou supérieure à celle du conduit vertical.Another disadvantage of these boxes is that the pressure drop is very important, it is often at least equal to or greater than that of the vertical duct.

De ce fait, le caisson a une influence primordiale dans le dimensionnement du ventilateur et sa consommation. Des pertes de charge élevées ont donc pour conséquence d'augmenter le coût de l'installation et de l'utilisation.Therefore, the box has a major influence in the design of the fan and its consumption. High pressure drops have the consequence of increasing the cost of installation and use.

Pour éviter une perte de charge trop élevée, il est d'usage courant de surdimensionner le caisson afin d'en réduire sa perte de charge. Cependant, cela entraîne un surdimensionnement du réseau horizontal, et par suite un encombrement et un coût de matériel supérieur.To avoid a loss of pressure too high, it is common practice to oversize the box to reduce its pressure drop. However, this results in an over-dimensioning of the horizontal network, and consequently a bulk and a higher hardware cost.

Un autre usage consiste à remplacer le caisson par un coude, entraînant alors une diminution de la perte de charge, un meilleur dimensionnement du réseau horizontal mais l'impossibilité de vérifier la vacuité des réseaux verticaux et rendant ainsi l'installation non conforme à la réglementation.Another use is to replace the box with a bend, resulting in a reduction of the pressure drop, a better dimensioning of the horizontal network but the impossibility to check the vacuity of the vertical networks and thus making the installation not in conformity with the regulations .

En effet, le caisson a également un rôle important pour l'entretien des installations, sa mise en oeuvre devant permettre la vérification de la vacuité du conduit vertical. Les caissons sont donc généralement équipés d'un couvercle démontable permettant les visites périodiques et le nettoyage des conduits mais aussi, conformément aux exigences réglementaires, d'assurer la protection du relevé d'étanchéité.Indeed, the box also has an important role for the maintenance of the facilities, its implementation to allow verification of the vacuity of the vertical duct. The boxes are generally equipped with a removable cover allowing periodic visits and cleaning of ducts but also, in accordance with the regulatory requirements, to ensure the protection of the waterproofing report.

Le document FR 2 624 580 décrit un caisson de liaison selon le préambule de la revendication 1.The document FR 2,624,580 discloses a junction box according to the preamble of claim 1.

La présente invention vise donc à remédier à ces inconvénients.The present invention therefore aims to remedy these drawbacks.

Le problème technique à la base de l'invention est la réalisation d'un caisson de liaison entre des conduits horizontaux et verticaux d'une installation de ventilation mécanique contrôlée d'un bâtiment permettant de limiter ses pertes de charge, tout en assurant une atténuation acoustique suffisante de l'installation de ventilation et permettant un entretien et une vérification de la vacuité des conduits verticaux.The technical problem underlying the invention is the production of a connecting box between horizontal and vertical ducts of a controlled mechanical ventilation system of a building to limit its pressure losses, while ensuring attenuation. sufficient acoustics of the ventilation system and allowing maintenance and verification of the void of the vertical ducts.

A cet effet, l'invention concerne un caisson de liaison entre des conduits horizontaux et verticaux d'une installation de ventilation mécanique contrôlée d'un bâtiment, du type comprenant un corps creux comportant une ouverture inférieure destinée à être raccordée à un conduit vertical, une ouverture supérieure équipée d'un couvercle de fermeture, la paroi latérale du corps creux comportant au moins une ouverture latérale destinée au montage d'un conduit de liaison avec un groupe de ventilation, caractérisé en ce qu'il est équipé de moyens de déflection amovibles permettant de diriger un flux d'air entrant par l'ouverture inférieure ou l'ouverture latérale, vers respectivement l'ouverture latérale ou l'ouverture inférieure, les moyens de déflection étant acoustiquement absorbant, et en ce que les moyens de déflection comprennent une plaque perforée cintrée, dont la face convexe est tournée vers le couvercle de fermeture et recouverte, sur sa face tournée vers le couvercle, d'une couche de matériau isolant acoustique.To this end, the invention relates to a connecting box between horizontal and vertical ducts of a controlled mechanical ventilation installation of a building, of the type comprising a hollow body having a lower opening intended to be connected to a vertical duct, an upper opening provided with a closure lid, the side wall of the hollow body having at least one lateral opening for mounting a connecting duct with a ventilation unit, characterized in that it is equipped with deflection means removable members for directing a flow of incoming air through the lower opening or the lateral opening, to the lateral opening or the lower opening respectively, the deflection means being acoustically absorbent, and in that the deflection means comprise a curved perforated plate, whose convex face is turned towards the closure lid and covered, on its turned side towards the cover, a layer of acoustic insulating material.

Ainsi, lors du fonctionnement de l'installation de ventilation, les moyens de déflection dirigent le flux d'air entrant dans le caisson vers le conduit de liaison avec le groupe de ventilation, permettant donc une importante diminution des pertes de charge à l'intérieur du caisson et par conséquent un meilleur dimensionnement du ventilateur et une économie de consommation.Thus, during the operation of the ventilation system, the deflection means direct the flow of air entering the box towards the connecting duct with the ventilation unit, thus allowing a significant reduction in pressure losses inside. of the box and therefore a better dimensioning of the fan and a saving of consumption.

De plus, étant donné que les moyens de déflection sont également acoustiquement absorbant, il est possible d'atténuer le bruit incident et donc d'obtenir un niveau sonore réglementaire.In addition, since the deflection means are also acoustically absorbing, it is possible to attenuate the incident noise and thus to obtain a regulatory sound level.

Par ailleurs, étant donné que les moyens de déflection sont amovibles, une vérification de la vacuité du conduit vertical est possible. De ce fait, une installation de ventilation équipée de ce type de caisson est conforme à la réglementation en vigueur.Moreover, since the deflection means are removable, a verification of the emptiness of the vertical duct is possible. From this In fact, a ventilation system equipped with this type of box complies with the regulations in force.

Avantageusement, le bord supérieur de la plaque perforée est situé au niveau de la partie supérieure de l'ouverture latérale, et le bord inférieur de la plaque perforée est situé au niveau de la partie de l'ouverture inférieure, située du côté opposé à l'ouverture latérale.Advantageously, the upper edge of the perforated plate is located at the upper part of the lateral opening, and the lower edge of the perforated plate is located at the portion of the lower opening, located on the side opposite the lateral opening.

Selon un mode de réalisation de l'invention, au moins deux perforations ménagées sur la plaque perforée présentent des diamètres différents.According to one embodiment of the invention, at least two perforations formed on the perforated plate have different diameters.

Avantageusement, les perforations de diamètres différents ménagées sur la plaque perforée sont réparties aléatoirement.Advantageously, the perforations of different diameters formed on the perforated plate are distributed randomly.

Selon un mode de réalisation de l'invention, la plaque perforée est équipée de moyens de retenue de la couche de matériau isolant.According to one embodiment of the invention, the perforated plate is equipped with means for retaining the layer of insulating material.

Avantageusement, la plaque perforée est métallique.Advantageously, the perforated plate is metallic.

Selon un mode de réalisation de l'invention, la couche de matériau isolant acoustique est constituée de laine de verre ou de roche, de feutre comprimé, ou équivalents.According to one embodiment of the invention, the layer of acoustic insulating material is made of glass wool or rock, compressed felt, or the like.

Avantageusement, le corps creux est de forme générale cylindrique, d'axe correspondant à celui de l'ouverture inférieure.Advantageously, the hollow body is of cylindrical general shape, of axis corresponding to that of the lower opening.

De toute façon l'invention sera bien comprise à l'aide de la description qui suit, en référence au dessin schématique indexé représentant, à titre d'exemple non limitatif, une forme d'exécution de ce caisson.In any case the invention will be better understood with the aid of the description which follows, with reference to the indexed schematic drawing showing, by way of non-limiting example, an embodiment of this box.

Figure 1 est une vue très schématique d'une installation de ventilation équipée du caisson selon l'invention. Figure 1 is a very schematic view of a ventilation system equipped with the box according to the invention.

Figure 2 est une vue en coupe longitudinale du caisson selon l'invention. Figure 2 is a longitudinal sectional view of the box according to the invention.

Figure 3 est une vue de dessus du caisson sans son couvercle de fermeture. Figure 3 is a top view of the box without its closure lid.

Figure 4 est une vue en perspective des moyens de déflection selon l'invention. Figure 4 is a perspective view of the deflection means according to the invention.

La figure 1 représente très schématiquement une installation de ventilation mécanique contrôlée d'un bâtiment de plusieurs étages fonctionnant en extraction. Les planchers de chaque étage sont désignés par la référence 2, et le plancher de la terrasse de toiture est désigné par la référence 3.The figure 1 very schematically represents a controlled mechanical ventilation installation of a multi-storey building operating in extraction. The floors of each floor are designated by the reference 2, and the floor of the roof terrace is designated by the reference 3.

Toutes les bouches d'extraction d'air 4, montées dans les pièces des différents locaux à ventiler, sont associées à une colonne métallique verticale 5, qui est reliée par l'intermédiaire d'un caisson de piquage de terrasse 6 à un conduit horizontal 7 en communication avec le groupe de ventilation 8 situé en terrasse.All air extraction vents 4, mounted in the rooms of the various rooms to be ventilated, are associated with a metal column vertical 5, which is connected via a terrace branch box 6 to a horizontal pipe 7 in communication with the ventilation group 8 located on the terrace.

Comme montré plus particulièrement aux figures 2 et 3, le caisson 6 comprend un corps cylindrique métallique 9, d'axe vertical, dans lequel sont ménagées une ouverture inférieure 10 d'entrée d'air, de même axe que le caisson 6, en communication avec le conduit vertical 5, une ouverture supérieure 12 fermée par un couvercle 13 et une ouverture radiale 14 de sortie d'air, équipée d'une manchette 15 de raccordement au conduit horizontal 7.As shown more particularly to Figures 2 and 3 , the casing 6 comprises a cylindrical metal body 9, of vertical axis, in which are provided a lower air inlet opening 10, of the same axis as the casing 6, in communication with the vertical duct 5, an upper opening 12 closed by a cover 13 and a radial opening 14 of air outlet, equipped with a sleeve 15 for connection to the horizontal duct 7.

Le caisson 6 est également équipé de moyens de déflection amovibles 16, 17.The casing 6 is also equipped with removable deflection means 16, 17.

Comme représenté à la figure 4, les moyens de déflection amovibles comprennent une plaque métallique perforée et cintrée 16 de forme générale rectangulaire, recouverte, sur sa face convexe tournée vers le couvercle 13, d'une couche de matériau isolant acoustique 17 de dimensions sensiblement identiques à celles de la plaque métallique 16.As represented in figure 4 , the removable deflection means comprise a perforated metal plate bent 16 of generally rectangular shape, covered on its convex face facing the cover 13, a layer of acoustic insulating material 17 of dimensions substantially identical to those of the metal plate 16.

La plaque perforée 16 est équipée de deux pattes de retenue 18 ménagées sur ses bords longitudinaux, sensiblement au niveau de son bord supérieur 19, et d'un retour 20 ménagé sur son bord inférieur 21. Les pattes de retenue 18 et le retour 20 sont tournés vers l'intérieur du côté de la couche de matériau isolant acoustique 17 et sont destinés à maintenir cette dernière sur la plaque perforée 16.The perforated plate 16 is equipped with two retaining tabs 18 formed on its longitudinal edges, substantially at its upper edge 19, and a return 20 formed on its lower edge 21. The retaining tabs 18 and the return 20 are turned inwardly on the side of the acoustic insulating material layer 17 and are intended to hold the latter on the perforated plate 16.

Les caractéristiques physiques telle que la nature, l'épaisseur, la densité, etc., du matériau isolant acoustique sont choisies afin d'optimiser l'atténuation acoustique recherchée, par exemple une atténuation des basses ou moyennes fréquences. Selon différents modes de réalisation de l'invention, la couche de matériau isolant acoustique 17 peut être constituée, par exemple, de laine de verre ou de roche, de feutre comprimé, ou équivalents.The physical characteristics such as the nature, the thickness, the density, etc., of the acoustic insulating material are chosen in order to optimize the desired acoustic attenuation, for example attenuation of the low or medium frequencies. According to various embodiments of the invention, the layer of acoustic insulating material 17 may consist of, for example, glass wool or rock, compressed felt, or the like.

Comme montré à la figure 2, la plaque métallique 16 est cintrée, sa face convexe étant tournée vers le couvercle 13, le bord supérieur 19 de la plaque métallique 16 est situé au niveau de la partie supérieure de l'ouverture radiale 14 de sortie d'air et de forme complémentaire de celle de la paroi latérale du corps 9 tandis que le bord inférieur 21 de la plaque perforée 16 est en appui sur la paroi inférieure du caisson 6, au niveau de la partie de l'ouverture inférieure 10 d'entrée d'air, située du côté opposé à l'ouverture 14 de sortie d'air.As shown in figure 2 , the metal plate 16 is bent, its convex face being turned towards the cover 13, the upper edge 19 of the metal plate 16 is located at the upper part of the radial opening 14 of air outlet and of complementary shape that of the side wall of the body 9 while the lower edge 21 of the perforated plate 16 bears against the lower wall of the box 6, at the portion of the lower air inlet opening 10, on the opposite side to the air outlet opening 14.

Ainsi, lors du fonctionnement du groupe de ventilation 8, la plaque perforée 16 et le matériau isolant acoustique 17 permettent de diriger le flux d'air entrant par l'ouverture inférieure 10 d'entrée d'air, vers l'ouverture radiale 14 de sortie d'air raccordée au conduit horizontal 7 de liaison avec le groupe de ventilation 8.Thus, during the operation of the ventilation unit 8, the perforated plate 16 and the acoustic insulating material 17 make it possible to direct the flow of air entering through the lower air intake opening 10 towards the radial opening 14 of the air inlet. air outlet connected to the horizontal duct 7 connected to the ventilation unit 8.

La plaque perforée 16 délimite avec le couvercle 13 et le corps 9 un volume d'air plus ou moins rempli de matériau isolant acoustique 17. Ceci constitue un résonateur d'Helmholtz qui permet d'absorber une parties des ondes sonores incidentes et donc d'atténuer le bruit incident.The perforated plate 16 delimits with the cover 13 and the body 9 a volume of air more or less filled with acoustic insulating material 17. This is a Helmholtz resonator that absorbs a part of the incident sound waves and therefore of mitigate the incident noise.

La fréquence de résonance d'un résonateur d'Helmholtz dépend de la densité du matériau isolant acoustique, de la surface et de la profondeur des trous permettant la circulation d'air dans le résonateur et de la hauteur du volume d'air.The resonance frequency of a Helmholtz resonator depends on the density of the acoustic insulating material, the surface and the depth of the holes allowing air circulation in the resonator and the height of the air volume.

Lors d'une circulation d'air dans le résonateur d'Helmholtz constitué par la plaque perforée 16, le matériau isolant acoustique 17, le couvercle 13 et le corps 9, une partie des ondes sonores est absorbée par le matériau isolant acoustique 17 et une autre partie l'est par la surface des perforations 22 ménagées sur la plaque perforée 16.During a circulation of air in the Helmholtz resonator constituted by the perforated plate 16, the acoustic insulating material 17, the cover 13 and the body 9, part of the sound waves is absorbed by the acoustic insulating material 17 and a other part is by the surface of the perforations 22 formed on the perforated plate 16.

Cependant, le matériau isolant acoustique 17 ne permet d'absorber qu'une plage de fréquences bien déterminée et il en est de même pour chaque perforation 22 ménagée sur la plaque métallique 16.However, the acoustic insulating material 17 can only absorb a well-defined frequency range and the same is true for each perforation 22 formed on the metal plate 16.

Ainsi, si chaque perforation 22 a le même diamètre et la même surface, uniquement une plage restreinte de fréquences peut être absorbée.Thus, if each perforation 22 has the same diameter and the same surface, only a restricted range of frequencies can be absorbed.

Une solution pour étendre la plage d'efficacité du résonateur consiste en une répartition aléatoire de perforations 22 de diamètres différents sur la plaque 16. En effet, chaque perforation 22 utilise une portion de l'air emprisonné entre la plaque 16, le corps 9 et le couvercle 13, et forme un petit résonateur d'Helmholtz fonctionnant pour une plage de fréquences différente, permettant ainsi une meilleure atténuation du bruit incident.One solution for extending the efficiency range of the resonator consists in a random distribution of perforations 22 of different diameters on the plate 16. In fact, each perforation 22 uses a portion of the air trapped between the plate 16, the body 9 and the cover 13, and forms a small Helmholtz resonator operating for a different frequency range, thus allowing a better attenuation of the incident noise.

Il est donc envisageable de modifier les dimensions des perforations 22 afin d'optimiser l'atténuation acoustique recherchée en fonction d'un spectre.It is therefore possible to modify the dimensions of the perforations 22 in order to optimize the desired acoustic attenuation as a function of a spectrum.

Comme il ressort de ce qui précède, l'invention apporte une grande amélioration à la technique existante, en fournissant un caisson de liaison entre des conduits de ventilation horizontaux et verticaux, de structure simple, et possédant d'excellentes propriétés aérauliques et d'isolation acoustique.As is apparent from the foregoing, the invention provides a great improvement to the existing technique, providing a connecting box between horizontal and vertical ventilation ducts, simple structure, and having excellent aeraulic properties and insulation acoustic.

Il va de soi que l'invention n'est pas limitée à forme de réalisation, décrite ci-dessus à titre d'exemple, mais qu'elle en embrasse au contraire toutes les variantes de réalisation. C'est ainsi notamment que le corps creux 9 pourrait être, par exemple, de forme générale parallélépipédique et que l'installation de ventilation mécanique contrôlée pourrait fonctionner en insufflation, dans ce cas le flux d'air entre par l'ouverture radiale 14 et est dirigé par les moyens de déflection 16, 17 vers l'ouverture inférieure 10, sans que l'on sorte pour autant du cadre de l'invention.It goes without saying that the invention is not limited to an embodiment, described above by way of example, but that it encompasses all the variants of embodiment. Thus, in particular, the hollow body 9 could be, for example, generally parallelepipedal in shape and that the controlled mechanical ventilation installation could operate in insufflation, in this case the flow of air enters through the radial opening 14 and is directed by the deflection means 16, 17 to the lower opening 10, without departing from the scope of the invention.

Claims (8)

  1. A box structure (6) for linking between horizontal and vertical ducts of a mechanical ventilation installation of a building, of the type comprising a hollow body (9) including a lower opening (10) designed to be connected to a vertical duct (5), an upper opening (12) equipped with a closing lid (13), the side wall of the hollow body (9) including at least one side opening (14) designed for mounting a linking duct (7) with a ventilation group (8), characterized in that it is equipped with removable deflection means (16, 17) making it possible to orient an air flow entering through the lower opening (10) or side opening (14), respectively toward the side opening (14) or the lower opening (10), the deflection means (16, 17) being acoustically absorbing, and in that the deflection means (16, 17) comprise a curved perforated plate (16), the convex face of which is turned toward the closing lid (13) and covered, on the face thereof turned toward the lid (13), with a layer of acoustically insulating material (17).
  2. The box structure (6) according to claim 1, characterized in that the upper edge (19) of the perforated plate (16) is situated at the upper part of the side opening (14), and the lower edge (21) of the perforated plate (16) is situated at the part of the lower opening (10), situated on the side opposite the side opening (14).
  3. The box structure (6) according to one of claims 1 and 2, characterized in that at least two perforations (22) formed on the perforated plate (16) have different diameters.
  4. The box structure (6) according to claim 3, characterized in that the perforations (22) of different diameters formed on the perforated plate (16) are distributed randomly.
  5. The box structure (6) according to one of claims 1 to 4, characterized in that the perforated plate (16) is equipped with retaining means (18, 20) for retaining the layer of insulating material (17).
  6. The box structure (6) according to one of claims 1 to 5, characterized in that the perforated plate (16) is made from metal.
  7. The box structure (6) according to one of claims 1 to 6, characterized in that the layer of acoustic insulating material (17) is made up of glass or rock wool, compressed felt, or equivalent means.
  8. The box structure (6) according to one of claims 1 to 7, characterized in that the hollow body (9) has a generally cylindrical shape, with an axis corresponding to that of the lower opening (10).
EP06356006.4A 2005-02-03 2006-01-31 Box structure for linking between horizontal and vertical ducts of a mechanical ventilation installation of a building Active EP1701084B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0501085A FR2881512B1 (en) 2005-02-03 2005-02-03 HOUSING CONNECTION BETWEEN HORIZONTAL AND VERTICAL DUCTS OF A CONTROLLED MECHANICAL VENTILATION SYSTEM OF A BUILDING

Publications (2)

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EP1701084A1 EP1701084A1 (en) 2006-09-13
EP1701084B1 true EP1701084B1 (en) 2013-08-21

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EP06356006.4A Active EP1701084B1 (en) 2005-02-03 2006-01-31 Box structure for linking between horizontal and vertical ducts of a mechanical ventilation installation of a building

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EP (1) EP1701084B1 (en)
ES (1) ES2435995T3 (en)
FR (1) FR2881512B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102620104B (en) * 2012-03-21 2014-10-29 江苏大学 Flow induction noise isolating and muffling device
PL224106B1 (en) * 2013-08-23 2016-11-30 Ground Therm Spółka Z Ograniczoną Odpowiedzialnością Modular ventilation system and modules of the ventilation system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1184828A (en) * 1967-11-17 1970-03-18 Colchester Woods Improvements in or relating to Sound Attenuating Units
FR2624580B1 (en) * 1987-12-10 1990-02-09 Aldes CONNECTION BOX BETWEEN HORIZONTAL AND VERTICAL DUCTS OF A MECHANICAL VENTILATION SYSTEM OF A BUILDING, EQUIPPED WITH ACOUSTIC ABSORPTION MEANS
FR2800149B3 (en) * 1999-10-26 2001-08-31 Poliglas Sa NEW PANEL FOR AIR CONDITIONING DUCTS
US6640926B2 (en) * 2000-12-29 2003-11-04 Industrial Acoustics Company, Inc. Elbow silencer

Also Published As

Publication number Publication date
EP1701084A1 (en) 2006-09-13
ES2435995T3 (en) 2013-12-26
FR2881512B1 (en) 2007-03-30
FR2881512A1 (en) 2006-08-04

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