EP3409937A1 - Duct for air intake and noise attenuation - Google Patents

Duct for air intake and noise attenuation Download PDF

Info

Publication number
EP3409937A1
EP3409937A1 EP18169228.6A EP18169228A EP3409937A1 EP 3409937 A1 EP3409937 A1 EP 3409937A1 EP 18169228 A EP18169228 A EP 18169228A EP 3409937 A1 EP3409937 A1 EP 3409937A1
Authority
EP
European Patent Office
Prior art keywords
tubular
heat
internal structure
central portion
conduit
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Withdrawn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
EP18169228.6A
Other languages
German (de)
French (fr)
Inventor
Philippe PINEAU
Gregory Facq
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.)
Novares France SAS
Original Assignee
Novares France 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 Novares France SAS filed Critical Novares France SAS
Publication of EP3409937A1 publication Critical patent/EP3409937A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10137—Flexible ducts, e.g. bellows or hoses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1272—Intake silencers ; Sound modulation, transmission or amplification using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1277—Reinforcement of walls, e.g. with ribs or laminates; Walls having air gaps or additional sound damping layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1283—Manufacturing or assembly; Connectors; Fixations

Definitions

  • the present invention relates to an air intake duct connected to an internal combustion engine and a method of manufacturing such a duct.
  • turbocharged engines there is a high frequency acoustic component ranging from 1 kHz to 15 kHz. This acoustic component is generated by the turbocharger and can also propagate and radiate through the air supply ducts.
  • noise noise refers to the acoustic component that propagates in the air supply ducts
  • radiated noise is the sound component radiated by the air supply ducts, themselves.
  • a silencer usually has a central tube in which air circulates, and whose wall is perforated with a plurality of orifices which place the tube inside in communication with a peripheral chamber, delimited by a bell surrounding the central tube.
  • the small volume of air contained in each orifice acts substantially as a small mass, which would be suspended from a spring constituted by the larger volume of air contained in the peripheral chamber. An attenuation of the noise is thus obtained in a spectral band located near the characteristic frequency of this "mass-spring" system.
  • the silencer does not cover the entire frequency range. Indeed, the silencer does not have a sufficient level of attenuation in the field of low frequencies.
  • the resonator comprises a central tube having a closed bypass at right angles. This type of resonator is very selective and only works on a very thin frequency band.
  • the invention relates to a conduit for conveying gas and for attenuation of mouth noises and radiated noises intended to be connected to an internal combustion engine.
  • the conduit comprises (i) an internal structure having two tubular sleeves connected by a perforated central portion, a first sleeve being intended to be connected to an internal combustion engine and a second sleeve being intended to be connected to an intake circuit of air, the central portion being flexible to allow the sleeves to be connected to an internal combustion engine and an air intake circuit, the latter being misaligned, and (ii) a tubular sheet of heat-shrinkable fabric porous to the air being heat-shrunk on the central portion, the tubular sheet having a heat-shrinkable weft thread adapted to allow radial retraction of the tubular sheet with respect to a longitudinal axis of the tubular sheet.
  • the internal structure makes it possible to guarantee the resistance of the duct to the depression caused by the suction of air, while being flexible, thus facilitating the connection of the duct to an internal combustion engine and an intake circuit. air.
  • the tubular web heat-shrunk on the internal structure allows the conduit to have a porous surface along the entire length and over the entire periphery of the internal structure, thereby maximizing the sound attenuation performance of the conduit.
  • the heat-shrinking of the tubular sheet on the internal structure makes it possible to assemble the tubular sheet and the internal structure simply and inexpensively.
  • the invention provides an air intake duct which has a maximum porous media surface while being simple and inexpensive to manufacture.
  • the central portion may comprise a helical ring integral with the sleeves.
  • each sleeve may have a toric rib adapted to lock in translation the tubular heat-shrunk sheet on the internal structure.
  • the internal structure may be of thermoplastic material.
  • the internal structure may, for example, be manufactured by plastic injection.
  • the plastic injection manufacturing process makes it possible to manufacture the internal structure with a high production rate at a reduced cost.
  • the tubular web may be woven with a polyester monofilament weft yarn.
  • the tubular sheet heat-shrunk on the internal structure may have a porosity of between 200 l / m 2 / s and 600 l / m 2 / s under a pressure drop of 200 Pascals.
  • the tubular sheet has optimum porosity to attenuate the noise of mouths and radiated noise.
  • the heat-shrinking of the tubular sheet on the internal structure makes it possible to easily and quickly assemble the tubular sheet and the internal structure in an inexpensive manner.
  • the heat shrinkage has the advantage of being irreversible. Indeed, the tubular heat shrunk sheet will retain its shape even if it is subjected to high temperatures exceeding, for example, 110 ° C.
  • the step of providing an internal structure may comprise a plastic injection phase of the internal structure.
  • the step of thermoretracting the tubular sheet on the internal structure may comprise a heating phase of the tubular sheet on the internal structure at a temperature of between 100 ° C. and 150 ° C., for example in a furnace or in a furnace. an oven.
  • the invention relates to a duct 1 for air intake and attenuation of mouth noises and radiated noise.
  • the duct 1 is intended to be connected to an internal combustion engine.
  • the conduit 1 comprises in particular an internal structure 2 having two tubular sleeves 22 connected by a central portion 26 perforated and flexible.
  • the internal structure 2 may, for example, be made of thermoplastic material injected. According to other embodiments, the internal structure may, for example be made of molded thermoplastic material.
  • the central portion 26 comprises a helical ring 21 integrally formed with the sleeves 22.
  • the helical ring 21 allows the central portion 26 to be flexible.
  • each sleeve 22 has a toric rib 24.
  • the function of the toric ribs 24 will be detailed later.
  • the duct 1 also comprises a tubular sheet 4 of heat-shrinkable fabric porous to air.
  • the tubular sheet 4 has a weft thread 41 and a warp thread 42.
  • the weft thread 41 is made of heat-shrinkable material. According to the embodiment presented here, the weft thread 41 is a polyester monofilament.
  • the tubular sheet 4 is heat-shrunk on the internal structure 2.
  • the heat-shrinkable weft yarn 41 allows a radial retraction of the tubular sheet 4 with respect to a longitudinal axis I of the tubular sheet 4.
  • the tubular sheet 4 thermoretracted on the internal structure 2 has a porosity of between 80 l / m 2 / s and 250 l / m 2 / s.
  • the tubular sheet 4 has an optimal porosity to attenuate the noise of mouths and radiated noise.
  • the tubular sheet 4 is heat-shrunk on the toric ribs 24.
  • the tubular sheet 4 exerts a pressure on the toric ribs 24, which makes it possible to block in translation the tubular sheet 4 on the structure 2.
  • the tubular sheet 4, heat-shrunk on the internal structure 2 encloses the toric ribs 24, so that the tubular sheet 4 is locked in translation between the toric ribs 24.
  • a first sleeve 22 is connected to an internal combustion engine and a second sleeve 22 is connected to an air intake circuit.
  • the flexibility of the central portion 26 facilitates the connection of the sleeves 22 and also compensates for any misalignment between the sleeves 22 when connected to the internal combustion engine and the air intake circuit.
  • the internal structure 2 ensures the resistance of the duct 1 to the depression caused by the suction of air.
  • the tubular sheet 4 heat-shrunk on the internal structure 2 allows the conduit 1 to have a porous surface along the entire length and over the entire periphery of the central portion 26, thereby maximizing the acoustic attenuation performance of the conduit 1.
  • the heat shrinkage of the tubular sheet 4 on the internal structure 2 makes it possible to assemble the tubular sheet 4 and the internal structure 2 simply and inexpensively.
  • the invention provides an air intake duct 1 which has a maximum porous media surface ensuring maximum acoustic attenuation while being simple and inexpensive to manufacture.
  • the invention also relates to a method of manufacturing conduit 1.
  • the step of supplying the internal structure 2 may comprise a plastic injection phase of the internal structure 2.
  • the step of thermoretracting the tubular sheet on the internal structure may comprise a heating phase of the tubular sheet on the internal structure at a temperature between 100 ° C and 150 ° C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Exhaust Silencers (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

L'invention concerne un conduit (1) d'acheminement de gaz et d'atténuation des bruits de bouche et des bruits rayonnés, destiné à être relié à un moteur à combustion interne. Le conduit comprend (i) une structure interne (2) présentant deux manchons (22) tubulaires reliés par une portion centrale (26) ajourée, un premier manchon (22) étant destiné à être connecté à un moteur à combustion interne et un deuxième manchon (22) étant destiné à être connecté à un circuit d'admission d'air, la portion centrale (26) étant flexible pour permettre de connecter les manchons (22) à un moteur à combustion interne et un circuit d'admission d'air désalignés, et (ii) une nappe tubulaire (4) de tissu thermorétractable poreux à l'air étant thermorétractée sur la portion centrale (26), la nappe tubulaire (4) présentant un fil de trame (41) thermorétractable adapté pour permettre une rétractation radiale de la nappe tubulaire (4) par rapport à un axe longitudinal (l) de la nappe tubulaire (4)

Figure imgaf001
The invention relates to a duct (1) for conveying gas and attenuating mouth noises and radiated noises intended to be connected to an internal combustion engine. The conduit comprises (i) an internal structure (2) having two tubular sleeves (22) connected by a pierced central portion (26), a first sleeve (22) being intended to be connected to an internal combustion engine and a second sleeve (22) being intended to be connected to an air intake circuit, the central portion (26) being flexible to allow the sleeves (22) to be connected to an internal combustion engine and an air intake circuit misaligned, and (ii) a tubular web (4) of heat-shrinkable air-porous fabric being heat-shrunk on the central portion (26), the tubular web (4) having a heat shrinkable weft yarn (41) adapted to allow retraction radial of the tubular web (4) with respect to a longitudinal axis (1) of the tubular web (4)
Figure imgaf001

Description

La présente invention concerne un conduit d'admission d'air relié à un moteur à combustion interne et un procédé de fabrication d'un tel conduit.The present invention relates to an air intake duct connected to an internal combustion engine and a method of manufacturing such a duct.

Il est connu que les moteurs à combustion interne présentent une composante acoustique basse fréquence allant de 30Hz à 1kHz. Cette composante acoustique est générée par l'ouverture et la fermeture périodique des soupapes, ainsi que par les résonances des différentes cavités du moteur (chambres de combustion, conduits, ...). La composante acoustique basse fréquence se propage et rayonne à l'entrée du circuit d'alimentation en air du moteur. En se propageant à l'intérieur des conduits d'alimentation en air du moteur, la composante acoustique basse fréquence excite la résonance des conduits, ce qui génère de fortes émissions acoustiques.It is known that internal combustion engines have a low frequency acoustic component ranging from 30Hz to 1kHz. This acoustic component is generated by the opening and the periodic closing of the valves, as well as by the resonances of the different cavities of the engine (combustion chambers, ducts, ...). The low frequency acoustic component propagates and radiates at the inlet of the engine air supply circuit. While propagating inside the air supply ducts of the engine, the low frequency acoustic component excites the resonance of the ducts, which generates high acoustic emissions.

En outre, dans le cas des moteurs turbocompressés, il existe une composante acoustique haute fréquence allant de 1kHz à 15kHz. Cette composante acoustique est générée par le turbocompresseur et peut aussi se propager et rayonner à travers les conduits d'alimentation en air.In addition, in the case of turbocharged engines, there is a high frequency acoustic component ranging from 1 kHz to 15 kHz. This acoustic component is generated by the turbocharger and can also propagate and radiate through the air supply ducts.

Traditionnellement, on désigne par bruit de bouche la composante acoustique qui se propage dans les conduits d'alimentation en air, et on désigne par bruit rayonné la composante acoustique rayonnée par les conduits d'alimentation en air, eux-mêmes.Traditionally, noise noise refers to the acoustic component that propagates in the air supply ducts, and radiated noise is the sound component radiated by the air supply ducts, themselves.

Actuellement, pour atténuer les bruits émanant des conduits d'admission d'air, il est connu d'utiliser un silencieux. Un silencieux présente usuellement un tube central dans lequel circule de l'air, et dont la paroi est perforée de plusieurs orifices qui mettent en communication l'intérieur du tube avec une chambre périphérique, délimitée par une cloche qui entoure le tube central. Lorsqu'il est stimulé par des ondes sonores, le faible volume d'air contenu dans chaque orifice agit sensiblement comme une petite masse, qui serait suspendue à un ressort constitué par le volume d'air plus important contenu dans la chambre périphérique. On obtient ainsi une atténuation du bruit dans une bande spectrale située au voisinage de la fréquence caractéristique de ce système « masse-ressort ».Currently, to reduce the noise emanating from the air intake ducts, it is known to use a silencer. A silencer usually has a central tube in which air circulates, and whose wall is perforated with a plurality of orifices which place the tube inside in communication with a peripheral chamber, delimited by a bell surrounding the central tube. When stimulated by sound waves, the small volume of air contained in each orifice acts substantially as a small mass, which would be suspended from a spring constituted by the larger volume of air contained in the peripheral chamber. An attenuation of the noise is thus obtained in a spectral band located near the characteristic frequency of this "mass-spring" system.

Cependant, le silencieux ne permet pas de couvrir toute la plage de fréquence. En effet, le silencieux ne présente pas un niveau d'atténuation suffisant dans le domaine des basses fréquences.However, the silencer does not cover the entire frequency range. Indeed, the silencer does not have a sufficient level of attenuation in the field of low frequencies.

Une autre solution consiste à utiliser un résonateur. Le résonateur comprend un tube central présentant une dérivation fermée à angle droit. Ce type de résonateur est très sélectif et ne fonctionne que sur une bande de fréquence très mince.Another solution is to use a resonator. The resonator comprises a central tube having a closed bypass at right angles. This type of resonator is very selective and only works on a very thin frequency band.

Pour améliorer les caractérisitiques acoustiques du conduit d'admission d'air, il est aussi connu de lui adjoindre un média poreux qui apporte une performance acoustique. A ce sujet le document FR2788833 , déposé par le demandeur propose un conduit sur une portion duquel est surmoulé un média poreux. Une autre solution connue consiste à souder deux demi-coques, produites par thermoformage, d'un média polyester poreux. On peut aussi citer le document JP 2008063970 dans lequel un tuyau poreux est réalisé avec deux demi-coques en média poreux thermocompressé. Les deux demi-coques sont assemblées par un système de clipsage rapporté. La mise en oeuvre de ces différentes techniques impose l'utilisation d'un outillage onéreux, tel qu'un moule d'injection incluant un système robotisé, pour mettre en place le média poreux dans le moule. De plus, ces techniques ne permettent pas de réaliser un tuyau 100% poreux en raison des contraites techniques de fabrication.To improve the acoustical characteristics of the air intake duct, it is also known to add a porous media that provides an acoustic performance. On this subject the document FR2788833 , filed by the applicant proposes a conduit on a portion of which is molded a porous media. Another known solution is to weld two half-shells, produced by thermoforming, a porous polyester media. We can also mention the document JP 2008063970 wherein a porous pipe is made with two half-shells in porous media thermocompressed. The two half-shells are assembled by a clipping system reported. The implementation of these different techniques requires the use of expensive tools, such as an injection mold including a robotic system, to set up the porous media in the mold. In addition, these techniques do not make it possible to make a pipe that is 100% porous because of the technical manufacturing constraints.

Une autre technique connue du document EP 0665404 consiste à enrouler un média poreux autour d'une structure métallique. Cette technique nécessite l'utilisation d'une machine spéciale d'enroulement filamentaire, ce type de machine étant très onéreux.Another technique known from the document EP 0665404 is to wind a porous media around a metal structure. This technique requires the use of a special filament winding machine, this type of machine being very expensive.

En conséquence, la présente invention a pour objectif de fournir un conduit d'admission d'air qui présente une surface maximale de média poreux tout en étant d'une fabrication simple et peu onéreuse.Accordingly, it is an object of the present invention to provide an air intake duct having a maximum porous media surface while being simple and inexpensive to manufacture.

Selon une définition générale, l'invention concerne un conduit d'acheminement de gaz et d'atténuation des bruits de bouche et des bruits rayonnés, destiné à être relié à un moteur à combustion interne. Le conduit comprend (i) une structure interne présentant deux manchons tubulaires reliés par une portion centrale ajourée, un premier manchon étant destiné à être connecté à un moteur à combustion interne et un deuxième manchon étant destiné à être connecté à un circuit d'admission d'air, la portion centrale étant flexible pour permettre de connecter les manchons à un moteur à combustion interne et un circuit d'admission d'air, ces derniers pouvant être désalignés, et (ii) une nappe tubulaire de tissu thermorétractable poreux à l'air étant thermorétractée sur la portion centrale, la nappe tubulaire présentant un fil de trame thermorétractable adapté pour permettre une rétractation radiale de la nappe tubulaire par rapport à un axe longitudinal de la nappe tubulaire.According to a general definition, the invention relates to a conduit for conveying gas and for attenuation of mouth noises and radiated noises intended to be connected to an internal combustion engine. The conduit comprises (i) an internal structure having two tubular sleeves connected by a perforated central portion, a first sleeve being intended to be connected to an internal combustion engine and a second sleeve being intended to be connected to an intake circuit of air, the central portion being flexible to allow the sleeves to be connected to an internal combustion engine and an air intake circuit, the latter being misaligned, and (ii) a tubular sheet of heat-shrinkable fabric porous to the air being heat-shrunk on the central portion, the tubular sheet having a heat-shrinkable weft thread adapted to allow radial retraction of the tubular sheet with respect to a longitudinal axis of the tubular sheet.

La structure interne permet de garantir la résistance du conduit à la dépression provoquée par l'aspiration d'air, tout en étant flexible, facilitant ainsi la connexion du conduit à un moteur à combustion interne et un circuit d'admission d'air. La nappe tubulaire thermorétractée sur la structure interne permet au conduit de présenter une surface poreuse sur toute la longueur et sur toute la périphérie de la structure interne, permettant ainsi de maximiser les performances d'atténuation acoustique du conduit. De plus, la thermorétractation de la nappe tubulaire sur la structure interne permet d'assembler la nappe tubulaire et la structure interne simplement et d'une manière peu onéreuse. Ainsi, l'invention fournit un conduit d'admission d'air qui présente une surface maximale de média poreux tout en étant d'une fabrication simple et peu onéreuse.The internal structure makes it possible to guarantee the resistance of the duct to the depression caused by the suction of air, while being flexible, thus facilitating the connection of the duct to an internal combustion engine and an intake circuit. air. The tubular web heat-shrunk on the internal structure allows the conduit to have a porous surface along the entire length and over the entire periphery of the internal structure, thereby maximizing the sound attenuation performance of the conduit. In addition, the heat-shrinking of the tubular sheet on the internal structure makes it possible to assemble the tubular sheet and the internal structure simply and inexpensively. Thus, the invention provides an air intake duct which has a maximum porous media surface while being simple and inexpensive to manufacture.

La portion centrale peut comprendre un jonc hélicoïdal venu de matière avec les manchons.The central portion may comprise a helical ring integral with the sleeves.

Selon une disposition particulière, chaque manchon peut présenter une nervure torique adaptée pour bloquer en translation la nappe tubulaire thermorétractée sur la structure interne.According to a particular arrangement, each sleeve may have a toric rib adapted to lock in translation the tubular heat-shrunk sheet on the internal structure.

Selon une disposition particulière, la structure interne peut être en matériau thermoplastique. Ainsi, la structure interne peut, par exemple, être fabriquée par injection plastique. La fabrication par injection plastique permet de fabriquer la structure interne avec une cadence de production élevée pour un coût réduit.According to a particular arrangement, the internal structure may be of thermoplastic material. Thus, the internal structure may, for example, be manufactured by plastic injection. The plastic injection manufacturing process makes it possible to manufacture the internal structure with a high production rate at a reduced cost.

Selon une disposition particulière, la nappe tubulaire peut être tissée avec un fil de trame monofilament de polyester.In a particular arrangement, the tubular web may be woven with a polyester monofilament weft yarn.

La nappe tubulaire thermorétractée sur la structure interne peut présenter une porosité comprise entre 200 l/m2/s et 600 l/m2/s sous une perte de charge de 200 Pascals. Ainsi, la nappe tubulaire présente une porosité optimale pour atténuer les bruits de bouches et les bruits rayonnés.The tubular sheet heat-shrunk on the internal structure may have a porosity of between 200 l / m 2 / s and 600 l / m 2 / s under a pressure drop of 200 Pascals. Thus, the tubular sheet has optimum porosity to attenuate the noise of mouths and radiated noise.

La présente invention concerne aussi un procédé de fabrication d'un conduit selon l'invention. Le procédé selon l'invention comprend les étapes suivantes :

  • fourniture d'une structure interne présentant deux manchons tubulaires reliés par une portion centrale ajourée et flexible,
  • fourniture d'une nappe tubulaire de tissu thermorétractable poreux à l'air, la nappe tubulaire présentant un fil de trame thermorétractable adapté pour permettre une rétraction radiale de la nappe tubulaire par rapport à un axe de la nappe tubulaire,
  • positionnement de la nappe tubulaire autour de la portion centrale de la structure interne,
  • thermorétractation de la nappe tubulaire sur la structure interne.
The present invention also relates to a method of manufacturing a conduit according to the invention. The method according to the invention comprises the following steps:
  • providing an internal structure having two tubular sleeves connected by a perforated and flexible central portion,
  • supplying a tubular sheet of heat-shrinkable fabric porous to air, the tubular sheet having a heat-shrinkable weft thread adapted to allow radial retraction of the tubular sheet with respect to an axis of the tubular sheet,
  • positioning the tubular sheet around the central portion of the internal structure,
  • heat shrinking of the tubular sheet on the internal structure.

D'une manière particulièrement avantageuse, la thermorétractation de la nappe tubulaire sur la structure interne permet d'assembler aisement et rapidemment la nappe tubulaire et la structure interne, d'une manière peu onéreuse. De plus, la thermorétractation présente l'avantage d'être irréversible. En effet, la nappe tubulaire thermorétractée conservera sa forme même si elle est soumise à des températures élevées dépassant, par exemple, 110°C.In a particularly advantageous manner, the heat-shrinking of the tubular sheet on the internal structure makes it possible to easily and quickly assemble the tubular sheet and the internal structure in an inexpensive manner. In addition, the heat shrinkage has the advantage of being irreversible. Indeed, the tubular heat shrunk sheet will retain its shape even if it is subjected to high temperatures exceeding, for example, 110 ° C.

L'étape de fourniture d'une structure interne peut comprendre une phase d'injection plastique de la structure interne.The step of providing an internal structure may comprise a plastic injection phase of the internal structure.

L'étape de thermorétractation de la nappe tubulaire sur la structure interne peut comprendre une phase de chauffage de la nappe tubulaire sur la structure interne à une température comprise entre 100°C et 150°C, par exemple au sein d'un four ou d'une étuve.The step of thermoretracting the tubular sheet on the internal structure may comprise a heating phase of the tubular sheet on the internal structure at a temperature of between 100 ° C. and 150 ° C., for example in a furnace or in a furnace. an oven.

D'autres caractéristiques et avantages de la présente invention ressortiront clairement de la description détaillée ci-après d'un mode de réalisation de l'invention donné à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels :

  • la figure 1 est une représentation schématique d'une structure interne d'un conduit selon l'invention,
  • la figure 2 est une représentation schématique du positionnement d'une nappe tubulaire autour d'une structure interne selon l'invention,
  • la figure 3 est une représentation schématique d'un conduit selon l'invention,
  • la figure 4 est un graphique comparatif de l'atténuation des bruits de bouche propagés par un conduit selon l'invention et par un conduit de l'art antérieur,
  • la figure 5 est un graphique comparatif de l'atténuation des bruits rayonnés par un conduit selon l'invention et par un conduit de l'art antérieur.
Other features and advantages of the present invention will emerge clearly from the following detailed description of an embodiment of the invention given by way of non-limiting example, with reference to the appended drawings in which:
  • the figure 1 is a schematic representation of an internal structure of a conduit according to the invention,
  • the figure 2 is a schematic representation of the positioning of a tubular sheet around an internal structure according to the invention,
  • the figure 3 is a schematic representation of a conduit according to the invention,
  • the figure 4 is a comparative graph of the attenuation of mouth noises propagated by a conduit according to the invention and by a conduit of the prior art,
  • the figure 5 is a comparative graph of the attenuation of noise radiated by a duct according to the invention and by a conduit of the prior art.

En référence aux figures 1 à 3, l'invention concerne un conduit 1 d'admission d'air et d'atténuation des bruits de bouche et des bruits rayonnés. Le conduit 1 est destiné à être relié à un moteur à combustion interne.With reference to Figures 1 to 3 the invention relates to a duct 1 for air intake and attenuation of mouth noises and radiated noise. The duct 1 is intended to be connected to an internal combustion engine.

Le conduit 1 comprend notamment une structure interne 2 présentant deux manchons 22 tubulaires reliés par une portion centrale 26 ajourée et flexible. La structure interne 2 peut, par exemple, être réalisée en matériau thermoplastique injecté. Selon d'autres modes de réalisation, la structure interne peut, par exemple être réalisée en matériau thermoplastique moulé.The conduit 1 comprises in particular an internal structure 2 having two tubular sleeves 22 connected by a central portion 26 perforated and flexible. The internal structure 2 may, for example, be made of thermoplastic material injected. According to other embodiments, the internal structure may, for example be made of molded thermoplastic material.

Selon le mode de réalisation ici présenté, la portion centrale 26 comprend un jonc hélicoïdal 21 venu de matière avec les manchons 22. D'une manière avantageuse, le jonc hélicoïdal 21 permet à la portion centrale 26 d'être flexible.According to the embodiment presented here, the central portion 26 comprises a helical ring 21 integrally formed with the sleeves 22. Advantageously, the helical ring 21 allows the central portion 26 to be flexible.

Selon le mode de réalisation ici présenté, chaque manchon 22 présente une nervure torique 24. La fonction des nervures toriques 24 sera détaillée ultérieurement.According to the embodiment presented here, each sleeve 22 has a toric rib 24. The function of the toric ribs 24 will be detailed later.

Le conduit 1 comprend aussi une nappe tubulaire 4 de tissu thermorétractable poreux à l'air. La nappe tubulaire 4 présente un fil de trame 41 et un fil de chaine 42. Le fil de trame 41 est en matériau thermorétractable. Selon le mode de réalisation ici présenté, le fil de trame 41 est un monofilament de polyester.The duct 1 also comprises a tubular sheet 4 of heat-shrinkable fabric porous to air. The tubular sheet 4 has a weft thread 41 and a warp thread 42. The weft thread 41 is made of heat-shrinkable material. According to the embodiment presented here, the weft thread 41 is a polyester monofilament.

La nappe tubulaire 4 est thermorétractée sur la structure interne 2. D'une manière particulièrement avantageuse, le fil de trame 41 thermorétractable permet une rétractation radiale de la nappe tubulaire 4 par rapport à un axe longitudinal I de nappe tubulaire 4. Selon le mode de réalisation ici présenté, la nappe tubulaire 4 thermorétractée sur la structure interne 2 présente une porosité comprise entre 80 l/m2/s et 250 l/m2/s. Ainsi, la nappe tubulaire 4 présente une porosité optimale pour atténuer les bruits de bouches et les bruits rayonnés.The tubular sheet 4 is heat-shrunk on the internal structure 2. In a particularly advantageous manner, the heat-shrinkable weft yarn 41 allows a radial retraction of the tubular sheet 4 with respect to a longitudinal axis I of the tubular sheet 4. According to the method of embodiment presented here, the tubular sheet 4 thermoretracted on the internal structure 2 has a porosity of between 80 l / m 2 / s and 250 l / m 2 / s. Thus, the tubular sheet 4 has an optimal porosity to attenuate the noise of mouths and radiated noise.

Comme on peut l'observer sur la figure 3, la nappe tubulaire 4 est thermorétractée sur les nervures toriques 24. D'une manière particulièrement avantageuse, en étant thermorétractée, la nappe tubulaire 4 exerce une pression sur les nervures toriques 24, qui permet de bloquer en translation la nappe tubulaire 4 sur la structure interne 2. En d'autres termes, la nappe tubulaire 4, thermorétractée sur la structure interne 2, enserre les nervures toriques 24, de sorte que la nappe tubulaire 4 est bloquée en translation entre les nervures toriques 24.As can be seen on the figure 3 , the tubular sheet 4 is heat-shrunk on the toric ribs 24. In a particularly advantageous manner, by being heat-shrunk, the tubular sheet 4 exerts a pressure on the toric ribs 24, which makes it possible to block in translation the tubular sheet 4 on the structure 2. In other words, the tubular sheet 4, heat-shrunk on the internal structure 2, encloses the toric ribs 24, so that the tubular sheet 4 is locked in translation between the toric ribs 24.

En condition d'utilisation, un premier manchon 22 est connecté à un moteur à combustion interne et un deuxième manchon 22 est connecté à un circuit d'admission d'air. La flexibilité de la portion centrale 26 permet de faciliter la connexion des manchons 22 et permet aussi de compenser un éventuel désalignement entre les manchons 22 lorsqu'ils sont connectés au moteur à combustion interne et au circuit d'admission d'air.In use condition, a first sleeve 22 is connected to an internal combustion engine and a second sleeve 22 is connected to an air intake circuit. The flexibility of the central portion 26 facilitates the connection of the sleeves 22 and also compensates for any misalignment between the sleeves 22 when connected to the internal combustion engine and the air intake circuit.

De plus, la structure interne 2 permet de garantir la résistance du conduit 1 à la dépression provoquée par l'aspiration d'air. La nappe tubulaire 4 thermorétractée sur la structure interne 2 permet au conduit 1 de présenter une surface poreuse sur toute la longueur et sur toute la périphérie de la portion centrale 26, permettant ainsi de maximiser les performances d'atténuation acoustique du conduit 1. De plus, la thermorétractation de la nappe tubulaire 4 sur la structure interne 2 permet d'assembler la nappe tubulaire 4 et la structure interne 2 simplement et d'une manière peu onéreuse.In addition, the internal structure 2 ensures the resistance of the duct 1 to the depression caused by the suction of air. The tubular sheet 4 heat-shrunk on the internal structure 2 allows the conduit 1 to have a porous surface along the entire length and over the entire periphery of the central portion 26, thereby maximizing the acoustic attenuation performance of the conduit 1. In addition, the heat shrinkage of the tubular sheet 4 on the internal structure 2 makes it possible to assemble the tubular sheet 4 and the internal structure 2 simply and inexpensively.

En référence à la figure 4, il ressort d'un test faisant apparaître le niveau sonore en fonction de la fréquence sonore que le conduit 1 présente une propagation de bruits de bouche (courbe II) inférieure à la propagation de bruits de bouche d'un conduit de l'art antérieur (courbe III) utilisé pour le test.With reference to the figure 4 , it appears from a test showing the sound level as a function of the sound frequency that the duct 1 has a propagation of mouth noises (curve II) lower than the propagation of mouth noises of a duct of the prior art (curve III) used for the test.

De même, en référence à la figure 5, il ressort d'un test faisant apparaître le niveau sonore en fonction de la fréquence sonore que le conduit 1 présente une émission de bruits rayonnés (courbe IV) inférieure à l'émission de bruits rayonnés d'un conduit de l'art antérieur (courbe V) utilisé pour le test.Similarly, with reference to figure 5 , it emerges from a test showing the sound level as a function of the sound frequency that the duct 1 has a radiated noise emission (curve IV) lower than the emission of radiated noise from a duct of the prior art ( curve V) used for the test.

Ainsi, l'invention fournit un conduit 1 d'admission d'air qui présente une surface maximale de média poreux garantissant une atténuation acoustique maximale tout en étant d'une fabrication simple et peu onéreuse.Thus, the invention provides an air intake duct 1 which has a maximum porous media surface ensuring maximum acoustic attenuation while being simple and inexpensive to manufacture.

L'invention concerne aussi un procédé de fabrication du conduit 1.The invention also relates to a method of manufacturing conduit 1.

Le procédé selon l'invention comprend les étapes suivantes :

  • fourniture d'une structure interne 2 présentant deux manchons 22 tubulaires reliés par une portion centrale 26 ajourée et flexible,
  • fourniture d'une nappe tubulaire 4 de tissu thermorétractable poreux à l'air, la nappe tubulaire 4 présentant un fil de trame 41 thermorétractable adapté pour permettre une rétraction radiale de la nappe tubulaire 4 par rapport à un axe I de la nappe tubulaire 4,
  • positionnement de la nappe tubulaire 4 autour de la portion centrale 26 de la structure interne 2,
  • thermorétractation de la nappe tubulaire 4 sur la structure interne 2.
The method according to the invention comprises the following steps:
  • providing an internal structure 2 having two tubular sleeves 22 connected by a central portion 26 perforated and flexible,
  • supplying a tubular sheet 4 of heat-shrinkable fabric porous to air, the tubular sheet 4 having a heat-shrinkable weft yarn 41 adapted to allow radial retraction of the tubular sheet 4 with respect to an axis I of the tubular sheet 4,
  • positioning the tubular sheet 4 around the central portion 26 of the internal structure 2,
  • heat shrinking of the tubular sheet 4 on the internal structure 2.

L'étape de fourniture de la structure interne 2 peut comprendre une phase d'injection plastique de la structure interne 2.The step of supplying the internal structure 2 may comprise a plastic injection phase of the internal structure 2.

L'étape de thermorétractation de la nappe tubulaire sur la structure interne peut comprendre une phase de chauffage de la nappe tubulaire sur la structure interne à une température comprise entre 100°C et 150°C.The step of thermoretracting the tubular sheet on the internal structure may comprise a heating phase of the tubular sheet on the internal structure at a temperature between 100 ° C and 150 ° C.

Bien entendu, l'invention n'est nullement limitée au mode de réalisation décrit ci-dessus et illustré par les différentes figures, ce mode de réalisation n'ayant été donné qu'à titre d'exemple. Des modifications restent possibles, notamment du point de vue de la constitution des divers éléments ou par la substitution d'équivalents techniques, sans pour autant sortir du domaine de l'invention.Of course, the invention is not limited to the embodiment described above and illustrated by the various figures, this embodiment having no been given as an example. Modifications are possible, especially from the point of view of the constitution of the various elements or by the substitution of technical equivalents, without departing from the scope of the invention.

Claims (9)

Conduit (1) d'admission d'air et d'atténuation des bruits de bouche et des bruits rayonnés, destiné à être relié à un moteur à combustion interne, caractérisé en ce qu'il comprend (i) une structure interne (2) présentant deux manchons (22) tubulaires reliés par une portion centrale (26) ajourée, un premier manchon (22) étant destiné à être connecté à un moteur à combustion interne et un deuxième manchon (22) étant destiné à être connecté à un circuit d'admission d'air, la portion centrale (26) étant flexible pour permettre de connecter les manchons (22) à un moteur à combustion interne et un circuit d'admission d'air, et (ii) une nappe tubulaire (4) de tissu thermorétractable poreux à l'air étant thermorétractée sur la portion centrale (26), la nappe tubulaire (4) présentant un fil de trame (41) thermorétractable adapté pour permettre une rétractation radiale de la nappe tubulaire (4) par rapport à un axe longitudinal (l) de la nappe tubulaire (4).A duct (1) for air intake and for attenuation of mouth noises and radiated noises intended to be connected to an internal combustion engine, characterized in that it comprises (i) an internal structure (2) having two tubular sleeves (22) connected by a perforated central portion (26), a first sleeve (22) being intended to be connected to an internal combustion engine and a second sleeve (22) being intended to be connected to a circuit air intake, the central portion (26) being flexible to allow the sleeves (22) to be connected to an internal combustion engine and an air intake circuit, and (ii) a tubular sheet (4) of air-shrinkable heat-shrinkable fabric being heat-shrunk on the central portion (26), the tubular web (4) having a heat shrinkable weft yarn (41) adapted to allow radial retraction of the tubular web (4) with respect to an axis longitudinal (1) of the tubular sheet ( 4). Conduit (1) selon la revendication 1 caractérisé en ce que la portion centrale (26) comprend un jonc hélicoïdal (21) venu de matière avec les manchons (22).Conduit (1) according to claim 1 characterized in that the central portion (26) comprises a helical ring (21) integral with the sleeves (22). Conduit (1) selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que chaque manchon (22) présente une nervure torique (24) adaptée pour bloquer en translation la nappe tubulaire (4) thermorétractée sur la structure interne (2).Conduit (1) according to any one of claims 1 or 2, characterized in that each sleeve (22) has a toric rib (24) adapted to lock in translation the tubular web (4) heat-shrunk on the internal structure (2) . Conduit (1) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la structure interne (2) est en matériau thermoplastique.Conduit (1) according to any one of claims 1 to 3, characterized in that the internal structure (2) is made of thermoplastic material. Conduit (1) selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la nappe tubulaire (4) est tissée avec un fil de trame monofilament de polyester.Conduit (1) according to any one of claims 1 to 4, characterized in that the tubular web (4) is woven with a polyester monofilament weft yarn. Conduit (1) selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la nappe tubulaire (4) thermorétractée sur la structure interne (2) présente une porosité comprise entre 200 l/m2/s et 600 l/m2/s sous une perte de charge de 200 Pascals.Conduit (1) according to any one of claims 1 to 5, characterized in that the tubular web (4) heat-shrunk on the inner structure (2) has a porosity of between 200 l / m 2 / s and 600 l / m 2 / s under a loss of load of 200 Pascals. Procédé de fabrication d'un conduit (1) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le procédé comprend les étapes suivantes : - fourniture d'une structure interne (2) présentant deux manchons (22) tubulaires reliés par une portion centrale (26) ajourée et flexible, - fourniture d'une nappe tubulaire (4) de tissu thermorétractable poreux à l'air, la nappe tubulaire (4) présentant un fil de trame (41) thermorétractable adapté pour permettre une rétraction radiale de la nappe tubulaire (4) par rapport à un axe (l) de la nappe tubulaire (4), - positionnement de la nappe tubulaire (4) autour de la portion centrale (26) de la structure interne (2), - thermorétractation de la nappe tubulaire (4) sur la structure interne (2). A method of manufacturing a conduit (1) according to any one of claims 1 to 6, characterized in that the method comprises the following steps: - Providing an internal structure (2) having two tubular sleeves (22) connected by a perforated and flexible central portion (26), - Providing a tubular web (4) of heat-shrinkable fabric porous to air, the tubular web (4) having a heat shrinkable weft yarn (41) adapted to allow a radial retraction of the tubular web (4) relative to an axis (1) of the tubular sheet (4), positioning the tubular sheet (4) around the central portion (26) of the internal structure (2), - Heat shrinking of the tubular sheet (4) on the internal structure (2). Procédé selon la revendication 7, caractérisé en ce que l'étape de fourniture d'une structure interne (2) comprend une phase d'injection plastique de la structure interne (2).Process according to Claim 7, characterized in that the step of supplying an internal structure (2) comprises a plastic injection phase of the internal structure (2). Procédé selon l'une quelconque des revendications 7 ou 8, caractérisé en ce que l'étape de thermorétractation de la nappe tubulaire (4) sur la structure interne (2) comprend une phase de chauffage de la nappe tubulaire (4) sur la structure interne (2) à une température comprise entre 100°C et 150°C.Process according to either of Claims 7 and 8, characterized in that the step of heat-shrinking the tubular sheet (4) on the internal structure (2) comprises a heating phase of the tubular sheet (4) on the structure internal (2) at a temperature of between 100 ° C and 150 ° C.
EP18169228.6A 2017-05-31 2018-04-25 Duct for air intake and noise attenuation Withdrawn EP3409937A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1754830A FR3067064B1 (en) 2017-05-31 2017-05-31 AIR INTAKE AND NOISE ATTENUATION DUCT

Publications (1)

Publication Number Publication Date
EP3409937A1 true EP3409937A1 (en) 2018-12-05

Family

ID=59381522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18169228.6A Withdrawn EP3409937A1 (en) 2017-05-31 2018-04-25 Duct for air intake and noise attenuation

Country Status (2)

Country Link
EP (1) EP3409937A1 (en)
FR (1) FR3067064B1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0384924A1 (en) * 1989-02-28 1990-09-05 Asahi Kasei Kogyo Kabushiki Kaisha A process for producing a resin product having a bent hollow portion and a core usable for the same process
FR2762892A1 (en) * 1997-04-30 1998-11-06 Westaflex Automobile PIPE FOR THE TRANSPORT OF GASEOUS FLUIDS, ESPECIALLY IN AUTOMOBILES
JP2000282985A (en) * 1999-03-31 2000-10-10 Toyoda Gosei Co Ltd Air suction duct for vehicle
JP2005036716A (en) * 2003-07-14 2005-02-10 Honda Motor Co Ltd Soundproof structure of intake tube
DE202007017661U1 (en) * 2007-12-18 2008-03-13 Odenwald Chemie Gmbh Acoustic silencer for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0384924A1 (en) * 1989-02-28 1990-09-05 Asahi Kasei Kogyo Kabushiki Kaisha A process for producing a resin product having a bent hollow portion and a core usable for the same process
FR2762892A1 (en) * 1997-04-30 1998-11-06 Westaflex Automobile PIPE FOR THE TRANSPORT OF GASEOUS FLUIDS, ESPECIALLY IN AUTOMOBILES
JP2000282985A (en) * 1999-03-31 2000-10-10 Toyoda Gosei Co Ltd Air suction duct for vehicle
JP2005036716A (en) * 2003-07-14 2005-02-10 Honda Motor Co Ltd Soundproof structure of intake tube
DE202007017661U1 (en) * 2007-12-18 2008-03-13 Odenwald Chemie Gmbh Acoustic silencer for internal combustion engines

Also Published As

Publication number Publication date
FR3067064A1 (en) 2018-12-07
FR3067064B1 (en) 2021-06-04

Similar Documents

Publication Publication Date Title
EP1780398B1 (en) Intake silencer for a turbo compressed engine
FR2905983A1 (en) Sound damping device for gas turbine engine of helicopter, has air inlet including lips connected to passage in which lips are partially formed by acoustic attenuators that attenuate sound frequencies produced by rotation of compressor
FR2639678A1 (en) COMPARTMENT, ESPECIALLY OF CHICANES, OF THE RESONATOR TYPE OF HELMHOLTZ NOISE ATTENUATOR, ACOUSTIC SHIRT PARTICULARLY ANNULAR, FOR A PARTICULARLY ANNULAR CHANNEL OF A GAS TURBINE ENGINE, AND ENGINE EQUIPPED WITH THESE DEVICES
FR2954055A1 (en) HAIR DRYER WITH PASSIVE SILENT SYSTEM
EP3365547B1 (en) Acoustic attenuation device for an intake line
EP0890026B1 (en) Suction silencer system for a refrigeration compressor
EP0839273B1 (en) Intake manifold for internal combustion engine
FR2905984A1 (en) Gas turbine helicopter engine, has diffuser connected in downstream of turbines, and jet pump with wall formed partially by sound attenuator to attenuate sound frequency generated by rotation of turbines and annular combustion chamber
EP0177996B1 (en) Silencing apparatus for exhaust gases of internal-combustion engines
EP3916717B1 (en) Honeycomb soundproofing structure including a diaphragm provided with a tube configured to process different acoustic frequencies, method for manufacturing such a honeycomb soundproofing structure, and associated tool
EP3634712B1 (en) Method for manufacturing an air-intake duct
EP3409937A1 (en) Duct for air intake and noise attenuation
EP3303815B1 (en) Apparatus for damping diffused and radiated pipe noises
FR3027995A1 (en) DUCT INTEGRATING AN ACOUSTICAL ATTENUATION DEVICE
FR2914958A1 (en) Tubular circulation pipe for internal combustion engine of motor vehicle, has woven fabric adopting shape of portion of wall corresponding to opening and comprising meshes whose openings present low dimensions to prevent passage of liquid
EP2435685B1 (en) Gas turbine engine comprising exhaust cone with integrated muffler
FR2517749A1 (en) AIR FILTER FOR INTERNAL COMBUSTION ENGINE
EP2172640A1 (en) Method and device for attenuation of the intake noise of an internal combustion engine
EP1659283B1 (en) Pipe for conveying a gaseous medium and intake air device including such conduit system
EP3450739A1 (en) Filtering assembly
EP3636909A1 (en) Sound attenuation device for the intake line of an internal combustion engine provided with a turbocharger
FR3014148B1 (en) AIR INTAKE MANIFOLD FOR THERMAL ENGINE COMPRISING AN ACOUSTIC ATTENUATOR
EP2206896B1 (en) Cooling arrangement of an exhaust manifold integrated in the cylinder head
FR3067065B1 (en) AIR INTAKE DUCT
EP2354524B1 (en) Acoustic attenuation device for an intake line of a thermal engine, flexible tube and intake line comprising such a device

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20190225

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20210719

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20230627