EP2122226A2 - Ventilation duct including noise reduction means - Google Patents

Ventilation duct including noise reduction means

Info

Publication number
EP2122226A2
EP2122226A2 EP08761964A EP08761964A EP2122226A2 EP 2122226 A2 EP2122226 A2 EP 2122226A2 EP 08761964 A EP08761964 A EP 08761964A EP 08761964 A EP08761964 A EP 08761964A EP 2122226 A2 EP2122226 A2 EP 2122226A2
Authority
EP
European Patent Office
Prior art keywords
section
upstream
duct
reflection zone
ventilation duct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08761964A
Other languages
German (de)
French (fr)
Inventor
Flavien Dubief
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP2122226A2 publication Critical patent/EP2122226A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
    • B60H1/00557—Details of ducts or cables
    • B60H1/00564—Details of ducts or cables of air ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L43/00—Bends; Siphons
    • F16L43/008—Bends; Siphons made from plastic material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
    • B60H2001/006—Noise reduction

Definitions

  • the present invention relates to a ventilation duct for a vehicle cabin air-conditioning system comprising noise attenuation means.
  • the air conditioning system for a passenger compartment of a motor vehicle generally comprises a heat treatment unit for the air which is circulated to the passenger compartment by a fan motor.
  • Various ventilation ducts allow the circulation of the air driven by the fan of the device to properly located outputs in the passenger compartment, for example windshield, driver, front passenger or rear passenger outputs, at the head level. or feet.
  • the air conditioning system has become a more easily perceptible and annoying acoustic source to which the ventilation ducts contribute.
  • These ventilation ducts allow the sound of the fan to propagate in the passenger compartment by simple propagation of sound waves, on the one hand, and on the other hand, are also noise generators due to airflow turbulence generated by their forms and architectures.
  • the document FR2871872 describes an acoustic device of a ventilation duct provided with noise attenuation means for a vehicle cabin air-conditioning system.
  • the device described comprises noise attenuation means provided with an acoustic cavity placed in the air flow in the conduit.
  • the cavity placed on a portion of the straight or slightly curved conduit, consists of a localized expansion of the conduit with abrupt upstream and downstream transitions.
  • the conduit comprises an upstream section provided with an inlet mouth and a turning section
  • the noise attenuation means comprise a reflection zone located in the turn section, facing the upstream section, and adapted to reflect at least part of the incident waves to the inlet mouth.
  • the reflection zone is flat; the reflection zone is oriented so that it forms an angle of at least 90 degrees with respect to a longitudinal axis of the upstream section taken in the vicinity of the corner section;
  • the surface of the reflection zone is greater than the surface of a projection of a section of the upstream section on the corner section, along a longitudinal axis of the upstream section near the corner section; a projection of a section of a downstream section of the conduit on the turning section, along a longitudinal axis of the downstream section taken near the turning section on this corner section, is outside the zone of the zone of reflection ; the section of the duct situated between the upstream section and the reflection zone in the turning section and / or the section of the duct situated between the reflection zone in the turning section and a downstream section varies in a continuous manner; the reflective zone is connected to the portions of the conduit which are adjacent thereto by means of leaves; an external clearance is provided between the upstream section and the reflection zone; an internal boss is provided at the connection of the upstream section and the corner section, upstream of the reflection zone; the ratio of the section corresponding to the maximum height h of the boss with the section of the upstream section is substantially 0.2; the turning section takes the form of a bent portion whose
  • the reflection zone has the effect of reducing the amplitude of the sound waves circulating thereon at the exit of the duct and over many frequency bands.
  • the reflection zone is shifted on the small section, which allows to provide an empty expansion zone. Since this zone does not cause turbulence or other undesirable degradations of the flow, the zones of reflection and expansion are in fact transparent for the flow of air.
  • the invention can be implemented without difficulty by modifying the shape of the wall of the duct itself and therefore be made at low cost during the manufacture of the duct.
  • FIG. 1 is a schematic section of a first embodiment of a duct comprising a corner section according to the state of the technical, without acoustic device, leads in which the flow of air is represented by arrows,
  • FIG. 2 is a section of the duct of FIG. 1, in which acoustic waves are shown;
  • FIG. 3 is a diagrammatic section of a duct comprising a curve section with an acoustic device according to the invention; in which the flow of air is represented by arrows,
  • FIG. 4 is a section of the duct of FIG. 3, in which acoustic waves are shown;
  • FIG. 5 is a perspective view of a duct according to the invention, a section of which is shown in section in FIGS. and 7,
  • FIGS. 6, 8, 10 and 12 are views corresponding to FIG. 3 for embodiments
  • FIGS. 7, 9, 11 and 13 are views corresponding to FIG. 4 for the embodiments of FIGS. 6, 8, 10 and FIG.
  • FIGS. 14 and 16 are sections corresponding to FIG. 6 or 7 to highlight the dimensions
  • FIG. 15 is a section corresponding to FIGS. 8 or 9 for highlighting the dimensions
  • FIG. 17 is a section corresponding to an arrangement of the embodiment of FIGS. 6 and 7,
  • FIG. 18 is a section corresponding to Figures 12 or 13 to highlight the dimensions.
  • the ventilation system generally comprises an air heat treatment unit, between an outside air inlet supplemented, where appropriate, by a recirculated air intake and air outlets in the passenger compartment. The air is circulated from the air inlet (s) to the passenger compartment by a motorcycle fan.
  • Various ventilation ducts allow the transport of the air driven by the fan of the device to properly located outputs in the passenger compartment, for example the windshield outlets, driver, front passenger or rear passenger, at the head or feet.
  • the noise emitted, in particular by the fan motor, because of the mixing of the air for example, is transmitted to the passenger compartment by the ducts.
  • a Incident acoustic wave 10A incident is integrally transmitted between an upstream section 120 of the duct connected to an inlet mouth 140 of the duct and a downstream section 160 connected to an outlet mouth 180 of the duct, despite the presence of a corner in turn 200
  • the transmitted wave 1 10B is of the same amplitude as the incident wave 1 10A.
  • the noise emitted for example by the fan motor side inlet mouth 140 is not damped in the duct 100.
  • an acoustic device is placed in a bent duct 10, the acoustic device comprising noise attenuation means.
  • the bent ventilation duct 10 according to the invention comprises an upstream section 12 connected to a turn section 20. The air is intended to flow from upstream to downstream, from the apparatus to the upstream section 12 and then to the section of Turn 20.
  • the incident wave 11 of the noise in the duct 10 is shown in thick solid lines, the transmitted wave 11 T to the outlet mouth of the duct 18 in solid single lines, and the reflected wave 1 1 R in dotted lines.
  • turning section 20 must be understood in the sense of a bent portion whose angle formed by the two arms of the bend is between 30 and 150 degrees.
  • the noise attenuation means comprise, in the turning section 20 which forms a bend of the duct 10, a reflection zone 30, drawn in bold lines in the figures.
  • the frequency response of the characteristic in reflection of this zone 30 is a function of the material used and its thickness. It is thus possible to favor the attenuation of a particular frequency or frequency band.
  • the reflection zone 30 is located in the duct 10, outside of the turning section 20, facing the upstream section 12, at a distance from a portion of the bent wall of the corner section 20 which includes the corner point of the bend. .
  • the reflection zone 30 is preferably flat but may also present bumps and more generally deformations of various shapes so as to match the internal shape of the duct 10.
  • the orientation of the reflection zone 30 is such that the incident waves 11 1 are reflected substantially in the direction of the inlet mouth 14, that is to say in a direction other than those leading to the point of contact. turn of the turning portion 20 or leading towards the outlet mouth 18. This prevents the reflected waves 1 1 R from propagating towards the outlet mouth 18.
  • the dimensions of the reflection zone 30 and its positioning are defined as a function of the section of the upstream section 12.
  • the projection of the section of the upstream section 12, along its longitudinal axis around the elbow, on the turn section 20 must, for optimum efficiency, be entirely on the reflection zone 30.
  • the surface of the reflection zone 30 is greater than or equal to the surface of this projection of the section of the upstream section 12 on an average plane of the reflection zone 30.
  • the projection of the section of the downstream section 16, along its longitudinal axis taken around the elbow, on the turn section 20 is outside the reflection zone 30.
  • the width D of the duct 10, in the upstream section 12 near the cornering section 20, determines the length L of the reflection zone 30.
  • the duct 10 may have an empty expansion zone 32 disposed near the reflection zone 30.
  • This zone 32 is a dead zone for the flow, it is that is, an area in which it can be considered that there is no flow or flow so small that it is considered insignificant. In this way, the empty zone 32 can be considered as not producing a pressure drop.
  • the section of the duct 10 is arranged. Between the upstream section 12 and the reflection zone 30 in the turn section 20 and between the reflection zone 30 in the turn section 20 and the downstream section 16, the section of the conduit 10 varies continuously. In doing so, the pressure losses are reduced, without prejudice to the reflection of the sound waves on the reflection zone 30.
  • the reflection zone 30 is oriented such that it is at an angle equal to 90 degrees with respect to the longitudinal axis of the upstream section 12 near the turning section. This angle is calculated in the anti-trigonometric direction from the longitudinal axis of the upstream section 12. In other words, the orientation of the reflection zone 30 is such that it is substantially parallel to the axis of the downstream section. 16 located near the turn section 20. According to a second embodiment of the invention, shown in Figures 6, 7, and 16, the reflection zone 30 is oriented such that it makes an angle greater than 90 degrees relative to the longitudinal axis of the upstream section 12 near the turn section 20.
  • this angle is calculated in the anti-trigonometric direction from the longitudinal axis of the upstream section 12. More precisely, in the figures, the value of this angle is 1 10 degrees.
  • an angle is defined with respect to the longitudinal axis of the downstream section 16 of the duct 10. This angle denoted a in FIG. a value of about 10 degrees in this example.
  • This angle is calculated in the anti-trigonometric direction from the longitudinal axis of the downstream section 16 of the duct 10. This embodiment makes it possible to increase the reflection of the incident waves 11 towards the upstream section 12 with respect to the first mode. of realization.
  • the reflection zone 30 is connected to the portions of the conduit 10 which are adjacent to it via fillet , indicated by arrows.
  • an internal boss 36 is made at the connection of the upstream section 12 and the corner section 20 just upstream of the reflection zone 30. By reproducing the beginning of a conventional turn, this boss 36 allows a better flow of air in the turn section 20, giving a turning pulse.
  • the ratio of the section corresponding to the maximum height of the boss 36 with the section of the upstream section is substantially 0.2. In FIG. 15, the height of this boss 36 is denoted h.
  • a fourth embodiment shown in Figures 10 and 11 presents both the features of the second and third embodiments.
  • the geometry of the duct is borrowed from the second embodiment and in particular the orientation of the reflection zone 30, and a boss 36 of the type of that made in the third embodiment is added.
  • This fourth embodiment then advantageously combines the advantages of these embodiments from which it is derived.
  • an external clearance 34 is formed between the upstream section 12 and the reflection zone 30.
  • This embodiment has the advantage of avoiding the formation of vortices in the flow of air at the empty expansion zone 32 to facilitate the flow of air in the conduit 10.
  • This external clearance 34 then allows to expand the empty expansion zone 32 upstream of the zone of Reflection 30.
  • the conduit 10, object of the invention can be obtained by injection or blowing.
  • the duct 10 according to the invention is intended to be connected to an air conditioning apparatus comprising a fan motor, for example in the manner illustrated in FIG. 5.
  • the upstream section 12 is then connected to a straight section of a line 40 of which the upstream free end 42 is provided to be connected to an air conditioning unit.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Duct Arrangements (AREA)

Abstract

The invention relates to a ventilation duct (10) for the air conditioning system of the passenger compartment of a vehicle, that comprises noise reduction means, characterised in that the duct includes an upstream section (12) with an inlet mouth (14) and a turning section (20), and in that the noise reduction means include a reflection area (30) provided in the turning section (20) opposite the upstream section (12) and capable of reflecting at least a portion of the incident waves (11) towards the inlet mouth (14).

Description

CON DUIT DE VENTILATION COMPORTANT DES MOYENS D'ATTEN UATION DE BRUIT VENTILATION CONDUCT HAVING MEANS FOR NOISE ATTENUATION
La présente invention se rapporte à un conduit de ventilation pour un système de climatisation d'habitacle de véhicule comportant des moyens d'atténuation de bruit.The present invention relates to a ventilation duct for a vehicle cabin air-conditioning system comprising noise attenuation means.
Le système de climatisation pour habitacle de véhicule automobile comporte, en général , un appareil de traitement thermique de l'air qui est mis en circulation vers l'habitacle par un moto ventilateur. Divers conduits de ventilation permettent la circulation de l'air entraîné par le ventilateur de l'appareil vers des sorties convenablement localisées dans l'habitacle, par exemple les sorties pare-brise, conducteur, passager avant ou passagers arrière, au niveau de la tête ou des pieds. Avec la réduction constante des nuisances acoustiques dues au moteur du véhicule, le système de climatisation est devenu une source acoustique plus facilement perceptible et gênante à laquelle contribuent les conduits de ventilation . Ces conduits de ventilation permettent au bruit du ventilateur de se propager dans l'habitacle par simple propagation d'ondes sonores, d'une part, et d'autre part, sont également générateurs de bruit du fait des turbulences d'écoulement d'air générées par leurs formes et architectures. On considère toutefois aujourd'hui que le bruit du ventilateur, perçu par les occupants du véhicule, est la source principale de bruit généré par le système. Le document FR2871872 décrit un dispositif acoustique d'un conduit de ventilation pourvu de moyens d'atténuation de bruit pour un système de climatisation d'habitacle de véhicule. Le dispositif décrit comprend des moyens d'atténuation de bruit pourvus d'une cavité acoustique placée dans l'écoulement d'air dans le conduit. La cavité, placée sur une portion du conduit droite ou légèrement courbe, est constituée d'un élargissement localisé du conduit à transitions amont et aval brusques.The air conditioning system for a passenger compartment of a motor vehicle generally comprises a heat treatment unit for the air which is circulated to the passenger compartment by a fan motor. Various ventilation ducts allow the circulation of the air driven by the fan of the device to properly located outputs in the passenger compartment, for example windshield, driver, front passenger or rear passenger outputs, at the head level. or feet. With the constant reduction of noise pollution due to the vehicle engine, the air conditioning system has become a more easily perceptible and annoying acoustic source to which the ventilation ducts contribute. These ventilation ducts allow the sound of the fan to propagate in the passenger compartment by simple propagation of sound waves, on the one hand, and on the other hand, are also noise generators due to airflow turbulence generated by their forms and architectures. However, it is now considered that the noise of the fan, perceived by the occupants of the vehicle, is the main source of noise generated by the system. The document FR2871872 describes an acoustic device of a ventilation duct provided with noise attenuation means for a vehicle cabin air-conditioning system. The device described comprises noise attenuation means provided with an acoustic cavity placed in the air flow in the conduit. The cavity, placed on a portion of the straight or slightly curved conduit, consists of a localized expansion of the conduit with abrupt upstream and downstream transitions.
Bien que donnant parfaitement satisfaction dans certains cas d'implantation dans un véhicule, un tel dispositif, relativement encombrant, peut ne pas être adapté à d'autres cas, notamment lorsque la place disponible pour l'implantation des moyens d'atténuation de bruit sur le conduit est très limitée.Although giving perfectly satisfactory in certain cases of implantation in a vehicle, such a device, relatively bulky, may not be suitable for other cases, especially when the available space for the implementation of noise attenuation means on the conduit is very limited.
C'est un objet de la présente invention que de proposer un conduit du type précité dans lequel le conduit comporte un tronçon amont pourvu d'une embouchure d'entrée et un tronçon de virage, et dans lequel les moyens d'atténuation de bruit comportent une zone de réflexion localisée dans le tronçon de virage, face au tronçon amont, et apte à réfléchir au moins en partie des ondes incidentes vers l'embouchure d'entrée. Selon d'autres caractéristiques avantageuses de l'invention qui peuvent être prises séparément ou en combinaison : la zone de réflexion est plane ; la zone de réflexion est orientée de telle manière que celle-ci forme un angle d'au moins 90 degrés par rapport à un axe longitudinal du tronçon amont pris au voisinage du tronçon de virage ;It is an object of the present invention to provide a conduit of the aforementioned type in which the conduit comprises an upstream section provided with an inlet mouth and a turning section, and wherein the noise attenuation means comprise a reflection zone located in the turn section, facing the upstream section, and adapted to reflect at least part of the incident waves to the inlet mouth. According to other advantageous features of the invention which can be taken separately or in combination: the reflection zone is flat; the reflection zone is oriented so that it forms an angle of at least 90 degrees with respect to a longitudinal axis of the upstream section taken in the vicinity of the corner section;
- la surface de la zone de réflexion est supérieure à la surface d'une projection d'une section du tronçon amont sur le tronçon de virage, selon un axe longitudinal du tronçon amont aux abords du tronçon de virage ; une projection d'une section d'un tronçon aval du conduit sur le tronçon de virage, selon un axe longitudinal du tronçon aval pris aux abords du tronçon de virage sur ce tronçon de virage, se situe en dehors de la zone de la zone de réflexion ; - la section du conduit se situant entre le tronçon amont et la zone de réflexion dans le tronçon de virage et/ou la section du conduit se situant entre la zone de réflexion dans le tronçon de virage et un tronçon aval varie de façon continue ; la zone de réflexion est raccordée aux portions du conduit qui lui sont adjacentes par l'intermédiaire de congés ; un dégagement externe est ménagé entre le tronçon amont et la zone de réflexion ; - un bossage interne est ménagé au raccordement du tronçon amont et du tronçon de virage, en amont de la zone de réflexion ; le rapport de la section correspondant à la hauteur maximale h du bossage avec la section du tronçon amont est sensiblement de 0,2 ; le tronçon de virage prend une forme d'une portion coudée dont l'angle entre les deux bras du coude est compris entre 30 et 150° ; Un autre objet de l'invention est dirigé vers un véhicule automobile comportant un système de climatisation muni d'un moto ventilateur et d'une sortie d'air dans un habitacle du véhicule, reliés par un conduit selon l'invention, le tronçon amont étant relié au moto ventilateur de manière à ce que de l'air circule d'amont en aval du moto ventilateur vers le tronçon amont puis vers le tronçon aval via le tronçon de virage.- The surface of the reflection zone is greater than the surface of a projection of a section of the upstream section on the corner section, along a longitudinal axis of the upstream section near the corner section; a projection of a section of a downstream section of the conduit on the turning section, along a longitudinal axis of the downstream section taken near the turning section on this corner section, is outside the zone of the zone of reflection ; the section of the duct situated between the upstream section and the reflection zone in the turning section and / or the section of the duct situated between the reflection zone in the turning section and a downstream section varies in a continuous manner; the reflective zone is connected to the portions of the conduit which are adjacent thereto by means of leaves; an external clearance is provided between the upstream section and the reflection zone; an internal boss is provided at the connection of the upstream section and the corner section, upstream of the reflection zone; the ratio of the section corresponding to the maximum height h of the boss with the section of the upstream section is substantially 0.2; the turning section takes the form of a bent portion whose angle between the two arms of the bend is between 30 and 150 °; Another object of the invention is directed towards a motor vehicle comprising an air conditioning system provided with a motorcycle fan and an air outlet in a passenger compartment of the vehicle, connected by a conduit according to the invention, the upstream section. being connected to the fan motor so that air flows from upstream to downstream of the fan motor to the upstream section and then to the downstream section via the corner section.
Avantageusement du point de vue acoustique, la zone de réflexion a pour effet de diminuer à la sortie du conduit et sur de nombreuses bandes de fréquences, l'amplitude des ondes sonores qui y circulent.Advantageously from the acoustic point of view, the reflection zone has the effect of reducing the amplitude of the sound waves circulating thereon at the exit of the duct and over many frequency bands.
D'autres avantages découlent de la localisation de la zone de réflexion sur un petit tronçon du conduit ne nécessitant qu'une faible augmentation du volume du conduit pour être efficace. La zone de réflexion est décalée sur le petit tronçon, ce qui permet de ménager une zone d'expansion vide. Cette zone ne provoquant pas de turbulences ou autres dégradations indésirables de l'écoulement, les zones de réflexion et d'expansion sont de fait transparente pour l'écoulement de l'air.Other advantages derive from the location of the reflection zone on a small section of the duct requiring only a small increase in the volume of the duct to be effective. The reflection zone is shifted on the small section, which allows to provide an empty expansion zone. Since this zone does not cause turbulence or other undesirable degradations of the flow, the zones of reflection and expansion are in fact transparent for the flow of air.
Il en découle que l'invention peut être mise en oeuvre sans difficulté en modifiant la forme de la paroi du conduit lui-même et par conséquent être réalisée à faible coût lors de la fabrication du conduit.It follows that the invention can be implemented without difficulty by modifying the shape of the wall of the duct itself and therefore be made at low cost during the manufacture of the duct.
D'autres caractéristiques et avantages de l'invention apparaîtront clairement à la lecture de la description suivante du mode de réalisation non limitatif de celle-ci, en liaison avec les dessins annexés sur lesquels :Other characteristics and advantages of the invention will become clear from reading the following description of the nonlimiting embodiment thereof, in conjunction with the appended drawings in which:
- la figure 1 est une section schématique d'un premier mode de réalisation d'un conduit comportant un tronçon en virage selon l'état de la technique, sans dispositif acoustique, conduit dans lequel le flux d'air est représenté par des flèches,FIG. 1 is a schematic section of a first embodiment of a duct comprising a corner section according to the state of the technical, without acoustic device, leads in which the flow of air is represented by arrows,
- la figure 2 est une section du conduit de la figure 1 , conduit dans lequel des ondes acoustiques sont représentées, - la figure 3 est une section schématique d'un conduit comportant un tronçon en virage avec un dispositif acoustique selon l'invention, conduit dans lequel le flux d'air est représenté par des flèches,FIG. 2 is a section of the duct of FIG. 1, in which acoustic waves are shown; FIG. 3 is a diagrammatic section of a duct comprising a curve section with an acoustic device according to the invention; in which the flow of air is represented by arrows,
- la figure 4 est une section du conduit de la figure 3, conduit dans lequel des ondes acoustiques sont représentées, - la figure 5 est une vue en perspective d'un conduit selon l'invention dont un tronçon est représenté en section aux figures 6 et 7,FIG. 4 is a section of the duct of FIG. 3, in which acoustic waves are shown; FIG. 5 is a perspective view of a duct according to the invention, a section of which is shown in section in FIGS. and 7,
- les figures 6, 8, 10 et 12 sont des vues correspondant à la figure 3 pour des modes de réalisations,FIGS. 6, 8, 10 and 12 are views corresponding to FIG. 3 for embodiments,
- les figures 7, 9, 1 1 et 13 sont des vues correspondant à la figure 4 pour les modes de réalisations respectivement des figures 6, 8, 10 etFIGS. 7, 9, 11 and 13 are views corresponding to FIG. 4 for the embodiments of FIGS. 6, 8, 10 and FIG.
1 2 ,1 2,
- les figures 14 et 16 sont des sections correspondant aux figure 6 ou 7 pour mettre en évidence les dimensions,FIGS. 14 and 16 are sections corresponding to FIG. 6 or 7 to highlight the dimensions,
- la figure 15 est une section correspondant aux figures 8 ou 9 pour mettre en évidence les dimensions,FIG. 15 is a section corresponding to FIGS. 8 or 9 for highlighting the dimensions,
- la figure 17 est une section correspondant à un aménagement du mode de réalisation des figures 6 et 7,FIG. 17 is a section corresponding to an arrangement of the embodiment of FIGS. 6 and 7,
- la figure 18 est une section correspondant aux figures 12 ou 13 pour mettre en évidence les dimensions. Traditionnellement, un véhicule automobile est équipé d'un système de ventilation pour l'habitacle. Le système de ventilation comporte, en général , un appareil de traitement thermique de l'air, entre une entrée d'air extérieur complétée, le cas échéant, par une entrée d'air recyclé et des sorties d'air dans l'habitacle. L'air est mis en circulation depuis la ou les entrées d'air vers l'habitacle par un moto ventilateur.- Figure 18 is a section corresponding to Figures 12 or 13 to highlight the dimensions. Traditionally, a motor vehicle is equipped with a ventilation system for the passenger compartment. The ventilation system generally comprises an air heat treatment unit, between an outside air inlet supplemented, where appropriate, by a recirculated air intake and air outlets in the passenger compartment. The air is circulated from the air inlet (s) to the passenger compartment by a motorcycle fan.
Divers conduits de ventilation permettent le transport de l'air entraîné par le ventilateur de l'appareil vers des sorties convenablement localisées dans l'habitacle, par exemple les sorties pare-brise, conducteur, passager avant ou passagers arrière, au niveau de la tête ou des pieds.Various ventilation ducts allow the transport of the air driven by the fan of the device to properly located outputs in the passenger compartment, for example the windshield outlets, driver, front passenger or rear passenger, at the head or feet.
Le bruit émis, notamment par le moto ventilateur, du fait du brassage de l'air par exemple, est transmis vers l'habitacle par les conduits.The noise emitted, in particular by the fan motor, because of the mixing of the air for example, is transmitted to the passenger compartment by the ducts.
Dans la réalisation d'un conduit 100 coudé selon l'état de la technique représenté aux figures 1 et 2, dans le sens de circulation de l'air dans le conduit, c'est-à-dire d'amont en aval, une onde acoustique 1 10A incidente est intégralement transmise entre un tronçon amont 120 du conduit relié à une embouchure d'entrée 140 du conduit et un tronçon aval 160 relié à une embouchure de sortie 180 du conduit, malgré la présence d'un tronçon en virage 200. Comme schématisé à la figure 2, l'onde transmise 1 10B est de même amplitude que l'onde incidente 1 10A.In the embodiment of a pipe 100 bent according to the state of the art shown in FIGS. 1 and 2, in the direction of air flow in the pipe, that is to say from upstream to downstream, a Incident acoustic wave 10A incident is integrally transmitted between an upstream section 120 of the duct connected to an inlet mouth 140 of the duct and a downstream section 160 connected to an outlet mouth 180 of the duct, despite the presence of a corner in turn 200 As schematized in FIG. 2, the transmitted wave 1 10B is of the same amplitude as the incident wave 1 10A.
Le bruit émis par exemple par le moto ventilateur côté embouchure d'entrée 140 n'est donc pas amorti dans le conduit 100.The noise emitted for example by the fan motor side inlet mouth 140 is not damped in the duct 100.
Selon l'invention, un dispositif acoustique est placé dans un conduit coudé 10, le dispositif acoustique comprenant des moyens d'atténuation de bruit. Le conduit de ventilation coudé 10 selon l'invention comporte un tronçon amont 12 raccordé à un tronçon de virage 20. L'air est prévu pour circuler d'amont en aval, de l'appareil vers le tronçon amont 12 puis vers le tronçon de virage 20. Sur les figures 4, 7, 9, 1 1 etAccording to the invention, an acoustic device is placed in a bent duct 10, the acoustic device comprising noise attenuation means. The bent ventilation duct 10 according to the invention comprises an upstream section 12 connected to a turn section 20. The air is intended to flow from upstream to downstream, from the apparatus to the upstream section 12 and then to the section of Turn 20. In Figures 4, 7, 9, 1 1 and
13, l'onde incidente 1 11 du bruit dans le conduit 10 est représentée en traits pleins épais, l'onde transmise 1 1 T vers l'embouchure de sortie du conduit 18 en traits pleins simples, et l'onde réfléchie 1 1 R en traits pointillés.13, the incident wave 11 of the noise in the duct 10 is shown in thick solid lines, the transmitted wave 11 T to the outlet mouth of the duct 18 in solid single lines, and the reflected wave 1 1 R in dotted lines.
La notion de tronçon de virage 20 doit être comprise au sens d'une portion coudée dont l'angle formé par les deux bras du coude est comprise entre 30 et 150 degrés.The notion of turning section 20 must be understood in the sense of a bent portion whose angle formed by the two arms of the bend is between 30 and 150 degrees.
Les moyens d'atténuation de bruit comportent, dans le tronçon de virage 20 qui forme un coude du conduit 10, une zone de réflexion 30, dessinée en traits gras sur les figures. La réponse en fréquence de la caractéristique en réflexion de cette zone 30 est fonction du matériau utilisé et de son épaisseur. On peut ainsi privilégier l'atténuation d'une fréquence ou bande de fréquence particulière. La zone de réflexion 30 est située, dans le conduit 10, côté extérieur du tronçon de virage 20, face au tronçon amont 12, à distance d'une portion de la paroi coudée du tronçon en virage 20 qui comporte le point de corde du virage. La zone de réflexion 30 est préférentiellement plane mais peut également présenter des bosses et plus généralement des déformations de formes diverses de manière à épouser la forme interne du conduit 10.The noise attenuation means comprise, in the turning section 20 which forms a bend of the duct 10, a reflection zone 30, drawn in bold lines in the figures. The frequency response of the characteristic in reflection of this zone 30 is a function of the material used and its thickness. It is thus possible to favor the attenuation of a particular frequency or frequency band. The reflection zone 30 is located in the duct 10, outside of the turning section 20, facing the upstream section 12, at a distance from a portion of the bent wall of the corner section 20 which includes the corner point of the bend. . The reflection zone 30 is preferably flat but may also present bumps and more generally deformations of various shapes so as to match the internal shape of the duct 10.
L'orientation de la zone de réflexion 30 est telle que les ondes incidentes 1 1 1 sont réfléchies sensiblement dans la direction de l'embouchure d'entrée 14 c'est-à-dire dans une direction autre que celles menant vers le point de corde du virage de la portion de virage 20 ou menant vers l'embouchure de sortie 18. On évite ainsi que les ondes réfléchies 1 1 R ne se propagent vers l'embouchure de sortie 18.The orientation of the reflection zone 30 is such that the incident waves 11 1 are reflected substantially in the direction of the inlet mouth 14, that is to say in a direction other than those leading to the point of contact. turn of the turning portion 20 or leading towards the outlet mouth 18. This prevents the reflected waves 1 1 R from propagating towards the outlet mouth 18.
Les dimensions de la zone de réflexion 30, ainsi que son positionnement se définissent en fonction de la section du tronçon amont 12. Selon l'invention, la projection de la section du tronçon amont 12, selon son axe longitudinal aux abords du coude, sur le tronçon de virage 20 doit, pour une efficacité optimale, se retrouver entièrement sur la zone de réflexion 30. Dit autrement, la surface de la zone de réflexion 30 est supérieure ou égale à la surface de cette projection de la section du tronçon amont 12 sur un plan moyen de la zone de réflexion 30.The dimensions of the reflection zone 30 and its positioning are defined as a function of the section of the upstream section 12. According to the invention, the projection of the section of the upstream section 12, along its longitudinal axis around the elbow, on the turn section 20 must, for optimum efficiency, be entirely on the reflection zone 30. In other words, the surface of the reflection zone 30 is greater than or equal to the surface of this projection of the section of the upstream section 12 on an average plane of the reflection zone 30.
De même, pour une efficacité optimale, la projection de la section du tronçon aval 16, selon son axe longitudinal pris aux abords du coude, sur le tronçon de virage 20, se situe en dehors de la zone de réflexion 30. Dans les exemples illustrés sur les figures 14 et 18, la largeur D du conduit 10, dans le tronçon amont 12 à proximité du tronçon en virage 20, détermine la longueur L de la zone de réflexion 30.Similarly, for optimum efficiency, the projection of the section of the downstream section 16, along its longitudinal axis taken around the elbow, on the turn section 20 is outside the reflection zone 30. In the illustrated examples in FIGS. 14 and 18, the width D of the duct 10, in the upstream section 12 near the cornering section 20, determines the length L of the reflection zone 30.
Comme représenté sur les figures 3, 6, 8 et 10, le conduit 10 peut présenter une zone vide d'expansion 32 disposée à proximité de la zone de réflexion 30. Cette zone 32 est une zone morte pour l'écoulement, c'est-à-dire une zone dans laquelle il peut être considéré qu'il n'y a pas d'écoulement ou un écoulement tellement faible qu'il est considéré comme insignifiant. De cette manière, la zone vide 32 peut être considérée comme ne produisant pas de perte de charge. Pour limiter les pertes de charge, la section du conduit 10 est aménagée. Entre le tronçon amont 12 et la zone de réflexion 30 dans le tronçon de virage 20 et entre la zone de réflexion 30 dans le tronçon de virage 20 et le tronçon aval 16, la section du conduit 10 varient continûment. Ce faisant, on réduit les pertes de charge, sans préjudice à la réflexion des ondes sonores sur la zone de réflexion 30.As shown in FIGS. 3, 6, 8 and 10, the duct 10 may have an empty expansion zone 32 disposed near the reflection zone 30. This zone 32 is a dead zone for the flow, it is that is, an area in which it can be considered that there is no flow or flow so small that it is considered insignificant. In this way, the empty zone 32 can be considered as not producing a pressure drop. To limit the losses, the section of the duct 10 is arranged. Between the upstream section 12 and the reflection zone 30 in the turn section 20 and between the reflection zone 30 in the turn section 20 and the downstream section 16, the section of the conduit 10 varies continuously. In doing so, the pressure losses are reduced, without prejudice to the reflection of the sound waves on the reflection zone 30.
Selon un premier mode de réalisation de l'invention, représenté sur les figures 3 et 4, la zone de réflexion 30 est orientée de telle manière qu'elle fasse un angle égal à 90 degrés par rapport à l'axe longitudinal du tronçon amont 12 à proximité du tronçon de virage. Cet angle est calculé dans le sens anti-trigonométrique à partir de l'axe longitudinal du tronçon amont 12. Dit autrement, l'orientation de la zone de réflexion 30 est telle qu'elle se trouve sensiblement parallèle à l'axe du tronçon aval 16 situé à proximité du tronçon de virage 20. Selon un deuxième mode de réalisation de l'invention, représenté aux figures 6, 7, et 16, la zone de réflexion 30 est orientée de telle manière qu'elle fasse un angle supérieur à 90 degrés par rapport à l'axe longitudinal du tronçon amont 12 à proximité du tronçon de virage 20. Comme dans le premier mode de réalisation , cette angle est calculé dans le sens anti-trigonométrique à partir de l'axe longitudinal du tronçon amont 12. Plus précisément, sur les figures, la valeur de cet angle est de 1 10 degrés. Dans l'exemple de réalisation représenté à la figure 16, pour décrire l'orientation de la zone de réflexion, on définit un angle par rapport à l'axe longitudinal du tronçon aval 16 du conduit 10. Cette angle noté a sur la figure prend une valeur d'environ 10 degrés dans cette exemple. On calcule cet angle dans le sens anti-trigonométrique à partir de l'axe longitudinal du tronçon aval 16 du conduit 10. Ce mode de réalisation permet d'augmenter la réflexion des ondes incidentes 1 11 vers le tronçon amont 12 par rapport au premier mode de réalisation . En variante, pour une continuité optimale de la variation de la section du conduit 10, dans l'exemple de réalisation de la figure 17, la zone de réflexion 30 est raccordée aux portions du conduit 10 qui lui sont adjacentes par l'intermédiaire de congés, indiqués par des flèches. Selon un troisième mode de réalisation de l'invention , représenté aux figures 8 et 9, un bossage interne 36 est réalisé au raccordement du tronçon amont 12 et du tronçon en virage 20, juste en amont de la zone de réflexion 30. En reproduisant le début d'un virage classique, ce bossage 36 permet un meilleur écoulement de l'air dans le tronçon de virage 20, en donnant une impulsion de virage. Avantageusement, le rapport de la section correspondant à la hauteur maximale du bossage 36 avec la section du tronçon amont est sensiblement de 0,2. Sur la figure 15, la hauteur de ce bossage 36 est notée h . Un quatrième mode de réalisation représenté aux figures 10 et 1 1 , présente à la fois les particularités des deuxième et troisième modes de réalisation . La géométrie du conduit est empruntée au deuxième mode de réalisation et notamment l'orientation de la zone de réflexion 30, et on ajoute un bossage 36 du type de celui réalisé dans le troisième mode de réalisation . Ce quatrième mode de réalisation combine alors avantageusement les avantages de ces modes de réalisation dont il est issu .According to a first embodiment of the invention, shown in Figures 3 and 4, the reflection zone 30 is oriented such that it is at an angle equal to 90 degrees with respect to the longitudinal axis of the upstream section 12 near the turning section. This angle is calculated in the anti-trigonometric direction from the longitudinal axis of the upstream section 12. In other words, the orientation of the reflection zone 30 is such that it is substantially parallel to the axis of the downstream section. 16 located near the turn section 20. According to a second embodiment of the invention, shown in Figures 6, 7, and 16, the reflection zone 30 is oriented such that it makes an angle greater than 90 degrees relative to the longitudinal axis of the upstream section 12 near the turn section 20. As in the first embodiment, this angle is calculated in the anti-trigonometric direction from the longitudinal axis of the upstream section 12. More precisely, in the figures, the value of this angle is 1 10 degrees. In the exemplary embodiment shown in FIG. 16, to describe the orientation of the reflection zone, an angle is defined with respect to the longitudinal axis of the downstream section 16 of the duct 10. This angle denoted a in FIG. a value of about 10 degrees in this example. This angle is calculated in the anti-trigonometric direction from the longitudinal axis of the downstream section 16 of the duct 10. This embodiment makes it possible to increase the reflection of the incident waves 11 towards the upstream section 12 with respect to the first mode. of realization. As a variant, for an optimal continuity of the variation of the section of the conduit 10, in the embodiment of FIG. 17, the reflection zone 30 is connected to the portions of the conduit 10 which are adjacent to it via fillet , indicated by arrows. According to a third embodiment of the invention, represented in FIGS. 8 and 9, an internal boss 36 is made at the connection of the upstream section 12 and the corner section 20 just upstream of the reflection zone 30. By reproducing the beginning of a conventional turn, this boss 36 allows a better flow of air in the turn section 20, giving a turning pulse. Advantageously, the ratio of the section corresponding to the maximum height of the boss 36 with the section of the upstream section is substantially 0.2. In FIG. 15, the height of this boss 36 is denoted h. A fourth embodiment shown in Figures 10 and 11, presents both the features of the second and third embodiments. The geometry of the duct is borrowed from the second embodiment and in particular the orientation of the reflection zone 30, and a boss 36 of the type of that made in the third embodiment is added. This fourth embodiment then advantageously combines the advantages of these embodiments from which it is derived.
Selon un cinquième mode de réalisation représenté aux figures 12, 13 et 18, un dégagement externe 34 est réalisé entre le tronçon amont 12 et la zone de réflexion 30. Ce mode de réalisation présente pour avantage d'éviter la formation de tourbillons dans l'écoulement de l'air au niveau de la zone vide d'expansion 32 pour faciliter l'écoulement d'air dans le conduit 10. Ce dégagement externe 34 permet alors d'élargir la zone vide d'expansion 32 en amont de la zone de réflexion 30. Le conduit 10, objet de l'invention peut être obtenu par injection ou par soufflage.According to a fifth embodiment shown in FIGS. 12, 13 and 18, an external clearance 34 is formed between the upstream section 12 and the reflection zone 30. This embodiment has the advantage of avoiding the formation of vortices in the flow of air at the empty expansion zone 32 to facilitate the flow of air in the conduit 10. This external clearance 34 then allows to expand the empty expansion zone 32 upstream of the zone of Reflection 30. The conduit 10, object of the invention can be obtained by injection or blowing.
Le conduit 10 selon l'invention est prévu pour être relié à un appareil de climatisation comprenant un moto ventilateur, par exemple de la manière illustrée à la figure 5. Le tronçon amont 12 est alors raccordé à un tronçon droit d'une canalisation 40 dont l'extrémité libre amont 42 est prévue pour être reliée à un appareil de climatisation . The duct 10 according to the invention is intended to be connected to an air conditioning apparatus comprising a fan motor, for example in the manner illustrated in FIG. 5. The upstream section 12 is then connected to a straight section of a line 40 of which the upstream free end 42 is provided to be connected to an air conditioning unit.

Claims

REVENDICATIONS
1 ) Conduit de ventilation (10) pour un système de climatisation d'habitacle de véhicule comportant un tronçon amont (12) pourvu d'une embouchure d'entrée (14) et un tronçon de virage (20), et des moyens d'atténuation de bruit comportant une zone de réflexion (30) localisée dans le tronçon de virage (20), face au tronçon amont (12), et apte à réfléchir au moins en partie des ondes incidentes (1 11) vers l'embouchure d'entrée (14) caractérisé en ce qu'une projection d'une section d'un tronçon aval (16) du conduit (10) sur le tronçon de virage (20), selon un axe longitudinal du tronçon aval (16) pris aux abords du tronçon de virage sur ce tronçon de virage (20), se situe en dehors de la zone de la zone de réflexion.1) Ventilation duct (10) for a vehicle cabin air-conditioning system comprising an upstream section (12) provided with an inlet mouth (14) and a turning section (20), and means for noise attenuation comprising a reflection zone (30) located in the turn section (20), facing the upstream section (12), and able to reflect at least part of the incident waves (1 11) towards the mouth of the input (14) characterized in that a projection of a section of a downstream section (16) of the duct (10) on the turning section (20), along a longitudinal axis of the downstream section (16) taken around of the turning section on this turn section (20) is outside the zone of the reflection zone.
2) Conduit de ventilation (10) selon la revendication 1 , caractérisé en ce que la zone de réflexion (30) est plane.2) Ventilation duct (10) according to claim 1, characterized in that the reflection zone (30) is flat.
3) Conduit de ventilation (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la zone de réflexion (30) est orientée de telle manière que celle-ci forme un angle, calculé dans le sens anti-trigonométrique à partir de l'axe longitudinal du tronçon amont 12, d'au moins 90 degrés par rapport à un axe longitudinal du tronçon amont (12) pris au voisinage du tronçon de virage (20).3) ventilation duct (10) according to any one of the preceding claims, characterized in that the reflection zone (30) is oriented such that it forms an angle, calculated in the anti-trigonometric direction from the longitudinal axis of the upstream section 12, at least 90 degrees with respect to a longitudinal axis of the upstream section (12) taken in the vicinity of the turning section (20).
4) Conduit de ventilation (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la surface de la zone de réflexion est supérieure à la surface d'une projection d'une section du tronçon amont sur le tronçon de virage, selon un axe longitudinal du tronçon amont aux abords du tronçon de virage.4) ventilation duct (10) according to any one of the preceding claims, characterized in that the surface of the reflection zone is greater than the surface of a projection of a section of the upstream section on the corner section, along a longitudinal axis of the upstream section around the corner section.
5) Conduit de ventilation (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la section du conduit5) Ventilation duct (10) according to any one of the preceding claims, characterized in that the section of the duct
(10) se situant entre le tronçon amont (12) et la zone de réflexion (30) dans le tronçon de virage (20) et/ou la section du conduit (10) se situant entre la zone de réflexion (30) dans le tronçon de virage (20) et un tronçon aval (16) varie de façon continue. 6) Conduit de ventilation (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la zone de réflexion (30) est raccordée aux portions du conduit (10) qui lui sont adjacentes par l'intermédiaire de congés. 7) Conduit de ventilation (10) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un dégagement externe (34) est ménagé entre le tronçon amont (12) et la zone de réflexion (30).(10) lying between the upstream section (12) and the reflection zone (30) in the turning section (20) and / or the section of the channel (10) lying between the reflection zone (30) in the turn section (20) and a downstream section (16) varies continuously. 6) ventilation duct (10) according to any one of the preceding claims, characterized in that the reflection zone (30) is connected to the portions of the duct (10) adjacent thereto by means of holidays. 7) ventilation duct (10) according to any one of the preceding claims, characterized in that an external clearance (34) is provided between the upstream section (12) and the reflection zone (30).
8) Conduit de ventilation (10) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un bossage interne (36) est ménagé au raccordement du tronçon amont (12) et du tronçon de virage (20), en amont de la zone de réflexion (30).8) ventilation duct (10) according to any one of the preceding claims, characterized in that an inner boss (36) is provided at the connection of the upstream section (12) and the turn section (20), upstream of the reflection zone (30).
9) Conduit de ventilation (10) selon la revendication précédente, caractérisé en ce que le rapport de la section correspondant à la hauteur maximale (h) du bossage (36) avec la section du tronçon amont (12) est sensiblement de 0,2.9) ventilation duct (10) according to the preceding claim, characterized in that the ratio of the section corresponding to the maximum height (h) of the boss (36) with the section of the upstream section (12) is substantially 0.2 .
10) Conduit de ventilation (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que le tronçon de virage (20) prend une forme d'une portion coudée dont l'angle entre les deux bras du coude est compris entre 30 et 150° . 1 1 ) Véhicule automobile comportant un système de climatisation muni d'un moto ventilateur et d'une sortie d'air dans un habitacle du véhicule, reliés par un conduit (10) selon l'une quelconque des revendications précédentes, le tronçon amont (12) étant relié au moto ventilateur de manière à ce que de l'air circule d'amont en aval du moto ventilateur vers le tronçon amont (12) puis vers le tronçon aval (16) via le tronçon de virage (20). 10) ventilation duct (10) according to any one of the preceding claims, characterized in that the turning section (20) takes the form of a bent portion whose angle between the two arms of the elbow is between 30 and 150 °. 1 1) A motor vehicle comprising an air conditioning system provided with a motorcycle fan and an air outlet in a passenger compartment of the vehicle, connected by a duct (10) according to any one of the preceding claims, the upstream section ( 12) being connected to the fan motor so that air flows from upstream to downstream of the fan motor to the upstream section (12) and then to the downstream section (16) via the turning section (20).
EP08761964A 2007-01-24 2008-01-22 Ventilation duct including noise reduction means Withdrawn EP2122226A2 (en)

Applications Claiming Priority (2)

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FR0752848A FR2911660B1 (en) 2007-01-24 2007-01-24 VENTILATION CONDUIT COMPRISING NOISE MITIGATION MEANS.
PCT/FR2008/050097 WO2008110707A2 (en) 2007-01-24 2008-01-22 Ventilation duct including noise reduction means

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WO2015043641A1 (en) * 2013-09-26 2015-04-02 Alfred Kärcher Gmbh & Co. Kg Suction device with sound mirror device
DE102021128207A1 (en) * 2021-10-28 2023-05-04 Alfred Kärcher SE & Co. KG Cleaning device with flow deflection element with mode filter and use of a flow deflection element with mode filter
DE102021128167A1 (en) * 2021-10-28 2023-05-04 Alfred Kärcher SE & Co. KG Cleaning device and use of a flow deflection element
DE102021128206A1 (en) * 2021-10-28 2023-05-04 Alfred Kärcher SE & Co. KG Cleaning device with flow deflection element with built-in wall and use of a flow deflection element with built-in wall

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WO2008110707A3 (en) 2008-11-06

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