EP3067547B1 - Turbocharger input connector with egr gas diffuser - Google Patents

Turbocharger input connector with egr gas diffuser Download PDF

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Publication number
EP3067547B1
EP3067547B1 EP16151780.0A EP16151780A EP3067547B1 EP 3067547 B1 EP3067547 B1 EP 3067547B1 EP 16151780 A EP16151780 A EP 16151780A EP 3067547 B1 EP3067547 B1 EP 3067547B1
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EP
European Patent Office
Prior art keywords
connector
duct
wall
gases
diffusion wall
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EP16151780.0A
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German (de)
French (fr)
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EP3067547A1 (en
Inventor
Bruno CHALMETTE
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Renault SAS
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Renault SAS
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    • 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
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system

Definitions

  • the present invention relates to an air inlet connector of a turbocharger of a motor vehicle engine.
  • the present invention more particularly relates to a turbocharger air inlet connector having a connection with a burnt gas recirculation circuit.
  • the present invention also relates to a heat engine comprising a turbocharger.
  • a turbocharger is one of the three main known supercharging systems generally used on internal combustion engines, gasoline or diesel, intended to increase the power density, the other two being the supercharger and the gas injection.
  • the principle of said systems is to increase the pressure of the admitted gases, allowing a better filling of the cylinders in mixture "air / fuel", thereby increasing the power density of the engine to increase power or reduce consumption with a smaller displacement engine.
  • NOx nitrogen oxides
  • blow-by gases mainly composed of air, which can come from the combustion chamber of the engine or other motor organs and which are passed through the piston rings and from the bottom of the crankcase where they are loaded with liquid oil, in the form of fine droplets. According to antipollution standards, these gases can not be released directly into the atmosphere, are then reinjected to the intake after being removed from their oil in order to avoid reducing the efficiency of combustion and thus increase toxic emissions.
  • the blow-by gases are therefore an air / oil drop mixture, where the drops are very diluted.
  • the filtering of the blow-by gases can be carried out in a known manner by decantation.
  • the decantation process consists of circulating the particle-laden gases in a decanter comprising a chamber equipped with baffles.
  • the oil collected by impaction is then returned essentially by gravity in the bottom of the crankcase by means of cannulas whose inlet is often placed at the bottom of the decanter.
  • Deoiled gases are in turn sent back into the air intake circuit in an intake manifold disposed upstream of the turbocharger.
  • the different inlet gas flows have different characteristics and they can not be mixed abruptly with one another at a single collection point.
  • the blow-by gases and the gases coming from the EGR circuit can thus not easily coexist and in particular the oil residues that may still be present in the blow-by gases must not reach a hot inlet of the EGR valve. under threat of fire.
  • the fresh air is supplied from an air filter by an air duct generally made of plastic with a rubber base.
  • EPDM is in known manner used for the manufacture of said conduits.
  • the burnt gases from the EGR circuit or the blow-by clarifier are generally incompatible with certain rubber bases used in the manufacture of an air duct. They can not be collected in the air duct with fresh air. Said burned gases must therefore be introduced into a rigid manifold such as an input connector of the turbocharger.
  • Said connector may have a shape adapted to improve the gas inlet velocity in the compressor of the turbocharger and the flow rate of said gas.
  • the fresh air flow portion in said connector is conically shaped to improve the fresh air flow rates at the turbocharger inlet.
  • the burned gases are thus led through a conduit to the turbocharger inlet connector where they join the fresh air.
  • the directions of the two flows of burnt gas and fresh air are substantially orthogonal in order to improve the mixing of the gases at the inlet to the turbocharger, but the flow of the burned gases can be significant and prevent the flow of Fresh air also arrives at the turbocharger or at least reduces the flow of fresh air creating a high pressure drop.
  • Geometry also causes an increase in the pressure drop of the fresh air flow. Indeed, the flow of recirculated gas opens a substantially cylindrical conduit in the conical shaped turbocharger inlet connector. The wall rupture due to the outlet of recirculated gas can then cause shocks and therefore pressure drops.
  • turbocharger inlet connector adapted to collect the flows of burnt gas, deoiled gas and fresh air having different characteristics and connected to the inlet of a turbocharger and allowing an optimal flow said mixed gases to the inlet of the turbocharger.
  • the publication FR-A1-2950659 discloses an input connector of a turbocharger capable of collecting the flow of gas from a circuit of burnt EGR recirculated gas and fresh air from an air filter.
  • Said connector is adapted to bring the flow of gas from the burnt gas recirculation circuit to be diffused into the fresh air flow before the compressor wheel.
  • Said connector comprises a substantially conical seal comprising holes for the diffusion of the burnt gases in the flow of fresh air flowing along the axis of the cone.
  • the connector comprises an additional piece which is the conical seal derived from a rubber-based material, which makes it difficult to connect the duct with de-oiled gases, especially if the bulk is an important factor. .
  • a disadvantage is that said connector is complex and expensive to produce.
  • One of the aims of the invention is to overcome these drawbacks and the subject of the invention is a turbocharger input connector of a heat engine capable of receiving a flow of recirculating gas, a stream of gases coming from settling and a flow of fresh air and bring the mixture of flows to the turbocharger by optimizing the circulation of gases and improving the mixing of said gases from their mixing point to the inlet of the turbocharger.
  • the outlet of the recirculated gas supply duct comprises a diffusion wall flush with the surface of the wall of the main duct to reduce the obstacles to the flow of fresh air and therefore the pressure drops.
  • the diffusion wall also makes it possible to reduce the impact of the introduction of recirculated gases into the fresh air flow.
  • the conical shape of the main fresh air duct makes it possible to increase the speed of the mixed gases at the inlet to the turbocharger.
  • the upstream and downstream terms refer to the flow direction of the gases before entering the turbocharger.
  • an input connector 10 is attached to the inlet of a turbocharger (not shown), said connector comprising an inlet for fresh air flows 11, an inlet for recirculated gas flows 12 from a quilting from the exhaust gas circuit preferably downstream of pollution control systems such as a nitrogen oxide catalyst or trap, and an inlet for de-oiled gas streams 14 taken from a decanter (not shown).
  • Recirculated gases and deoiled gases containing substances that may have reactions with rubber elements for example can not therefore be collected in a flexible conduit such as a fresh air supply duct. It is known to collect the flows of the different gases in a rigid element such as an input connector disposed at the inlet of a turbocharger.
  • the input connector 10 is made of rigid material, preferably thermoplastic. It comprises a support wall 16 having fastening holes 13 to be traversed by fixing screws (not shown) for securing said support wall 16 of the input connector 10 against the inlet of the turbocharger. Said support wall 16 has an orifice 18 opening into the inlet of the turbocharger.
  • the input connector 10 comprises a main conduit 20 connected to a fresh air supply circuit downstream of an air filter.
  • Said main duct 20 is preferably conical in order to increase the speed of the gases entering the turbocharger.
  • the input connector includes a connection with a recirculated gas circuit or "EGR" for Exhaust Gas Recirculation in English from a burnt gas exhaust system.
  • Said connection includes a channel supplying substantially cylindrical recirculated gas 21 dug in the connector 10 and opening substantially orthogonal in the main conduit 20 to improve the mixing of the gases at the inlet into the turbocharger.
  • Said supply channel is connected with a recirculated gas supply duct 22.
  • the axis of said recirculated gas supply channel X1 is therefore orthogonal to the axis X of the main duct 20.
  • the recirculated gas supply duct 22 comprises a tubular element 23 preferably bent in order to reduce the size of the connector and comprises a tubular upstream end adapted to be connected to a burned gas duct (not shown), and an end substantially tubular downstream adapted to be inserted into the recirculated gas supply channel 21.
  • said outlet of the recirculated gas supply channel 21 in the main duct 20 is masked by a diffusion wall 25 which is flush with the surface of the wall 24 of said main duct, which reduces the asperities at the surface of the duct wall. main effect with the effect of reducing turbulence near said outlet.
  • the term "flush" means that the shape of the diffusion wall 25 substantially matches the shape of the wall 24 of the main duct 20 without presenting asperities with respect to the wall 24 of the main duct.
  • the diffusion wall 25 comprises a substantially central main conical aperture 31 surrounded by at least one substantially conical auxiliary orifice at the periphery 32 of the diffusion wall.
  • the axes of the median and peripheral conical orifices are substantially parallel to each other and open substantially orthogonal to the diffusion wall 25 in the main duct.
  • Said conical orifices have a narrowed section 33 facing the main duct 20.
  • the diameter of the narrowed section 33 of the auxiliary orifices is substantially smaller than the diameter of the narrowed section 33 'of the median main orifice 31.
  • the diameter of the narrowed section 33 said narrowed section 33 of the auxiliary orifices at the periphery 32 is of the order of 1 mm while the diameter of the narrowed section 33 'of the main orifice 31 is of the order of 3 mm.
  • the diffusion wall 25 comprises a grid 41 fixed to the wall 24 of the main duct 20, said grating comprising at least one bar 42 extending preferably in a direction orthogonal to the axis of the main duct and substantially parallel to the wall 24 of the main duct 20.
  • the figure 5 thus represents the diffusion wall 25 which comprises a succession of parallel bars 42 extending along an axis X 2 orthogonal to the axis X of the primary duct 20.
  • the said bars may be fixed to an annular frame 43 whose external diameter is substantially equal to the diameter of the outflow of the supply channel 21 of recirculated gas.
  • Said frame 43 is fixed to the wall 24 of the main duct by welding or gluing.
  • the diffusion wall comprises a grid 51 comprising a multitude of orifices 52 of small diameter of the order of 1 to 2 mm distributed over the entire surface of said diffusion wall 25.
  • Said diffusion wall 25 masks the outlet of the recirculated gas duct 21 in the main duct 20 and the surface of said diffusion wall facing the main duct is in continuity with the surface of the wall 24 of the main duct.
  • the diffusion wall 25 thus has a portion of curved surface in the extension of the surface of the wall of the main duct.
  • Said diffusion wall can be fixed to the cylindrical duct 22 of recirculated gas or be integral with the inlet connector 10.
  • Said diffusion wall 25 can thus be fixed to the downstream end of the supply duct 22 of the recirculated gases by gluing or welding.
  • Said conduit for supplying recirculated gases is then pressed into the supply channel 21 of the recirculated gases.
  • said supply conduit 22 comprises a blister on the outer cylindrical surface complementary with a groove dug in the supply channel 21 of recirculated gas to serve as a foolproof.
  • the diffusion wall 25 and the inlet connector 10 of the turbocharger may also be of a piece obtained by molding in order to reduce the number of operations for obtaining the connector.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Supercharger (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Description

Domaine technique de l'inventionTechnical field of the invention

La présente invention concerne un connecteur d'entrée d'air d'un turbocompresseur d'un moteur thermique de véhicule automobile.The present invention relates to an air inlet connector of a turbocharger of a motor vehicle engine.

La présente invention concerne plus particulièrement un connecteur d'entrée d'air de turbocompresseur comportant une connexion avec un circuit de recirculation de gaz brulés.The present invention more particularly relates to a turbocharger air inlet connector having a connection with a burnt gas recirculation circuit.

La présente invention concerne également un moteur thermique comprenant un turbocompresseur.The present invention also relates to a heat engine comprising a turbocharger.

Etat de la techniqueState of the art

Les véhicules automobiles équipés de moteurs à combustion interne comprennent des systèmes destinés à améliorer l'efficacité desdits moteurs en augmentant par exemple la puissance tout en diminuant les rejets polluants. Un turbocompresseur est l'un des trois principaux systèmes connus de suralimentation généralement employés sur les moteurs à combustion interne, essence ou diesel, destinés à augmenter la puissance volumique, les deux autres étant le compresseur volumétrique et l'injection gazeuse.Motor vehicles equipped with internal combustion engines include systems to improve the efficiency of said engines by increasing the power, for example, while reducing pollutant emissions. A turbocharger is one of the three main known supercharging systems generally used on internal combustion engines, gasoline or diesel, intended to increase the power density, the other two being the supercharger and the gas injection.

Le principe desdits systèmes est d'augmenter la pression des gaz admis, permettant un meilleur remplissage des cylindres en mélange « air/carburant », permettant ainsi d'augmenter la puissance volumique du moteur afin d'augmenter la puissance ou de réduire la consommation avec un moteur de plus faible cylindrée.The principle of said systems is to increase the pressure of the admitted gases, allowing a better filling of the cylinders in mixture "air / fuel", thereby increasing the power density of the engine to increase power or reduce consumption with a smaller displacement engine.

Lesdits systèmes sont également associés à des systèmes de dépollution et une partie des gaz brulés encore chauds est récupérée pour être réinjectée dans le flux d'air d'admission, de manière préférentielle avant le turbocompresseur. Les gaz brulés sont prélevés depuis le circuit d'échappement en aval selon le sens d'écoulement des gaz des systèmes de dépollution qui comprennent par exemple un pot catalytique ou un piège à oxyde d'azote (ou NoxTrap en anglais). Ils sont renvoyés en amont du turbocompresseur via un circuit de gaz recirculés dont le passage est contrôlé par une vanne EGR (EGR pour Exhaust Gaz Recirculation en anglais). Ledit circuit est couramment connu sous le nom de circuit EGR. Le système de dépollution par recirculation des gaz d'échappement est donc constitué d'une conduite permettant de faire transiter les gaz d'échappement vers l'admission, assortie d'un échangeur thermique destiné à refroidir les gaz brûlés et de ladite vanne apte à régler le débit de gaz brûlés injectés dans le circuit d'admission d'air. Cette vanne est pilotée par le calculateur de contrôle moteur. Ce système a pour effet de :

  • ralentir la vitesse de combustion via la diminution de la proportion d'oxygène dans les gaz ;
  • augmenter la capacité thermique des gaz et donc diminuer leur température pendant la combustion ;
Said systems are also associated with pollution control systems and part of the still hot burned gases is recovered to be reinjected into the intake air flow, preferably before the turbocharger. The burned gases are taken from the downstream exhaust circuit according to the flow direction of the gases of the pollution control systems which include for example a catalytic converter or a nitrogen oxide trap (or NoxTrap in English). They are returned upstream of the turbocharger via a recirculated gas circuit whose passage is controlled by an EGR valve (EGR for Exhaust Gas Recirculation in English). Said circuit is commonly known as the EGR circuit. The exhaust gas recirculation pollution control system therefore consists of a pipe for passing the exhaust gas to the inlet, together with a heat exchanger for cooling the flue gases and said valve adapted to adjust the flow of burnt gases injected into the air intake system. This valve is controlled by the engine control computer. This system has the effect of:
  • slow down the rate of combustion by decreasing the proportion of oxygen in the gases;
  • increase the thermal capacity of the gases and thus reduce their temperature during combustion;

Ceci a pour effet de diminuer la quantité d'oxydes d'azote (NOx) dans les gaz échappement à l'origine notamment de la pollution atmosphérique à l'ozone.This has the effect of reducing the amount of nitrogen oxides (NOx) in the exhaust gases, especially from atmospheric pollution to ozone.

D'autres systèmes de récupération de gaz sont susceptibles d'amener également dans le circuit d'admission d'air des gaz ayant déjà passé dans le moteur. On distingue ainsi les gaz de blow-by, majoritairement composés d'air, qui peuvent provenir de la chambre de combustion du moteur ou d'autres organes moteurs et qui sont passés à travers les segments des pistons et par le bas du carter moteur où ils se chargent en huile liquide, sous forme de fines gouttelettes. Selon les normes d'antipollution, ces gaz ne pouvant être rejetés directement dans l'atmosphère, sont alors réinjectés à l'admission après avoir été débarrassés de leur huile afin d'éviter de réduire le rendement de la combustion et donc d'accroitre les émissions toxiques.Other gas recovery systems are likely to also bring into the air intake circuit gases that have already passed into the engine. There are thus the blow-by gases, mainly composed of air, which can come from the combustion chamber of the engine or other motor organs and which are passed through the piston rings and from the bottom of the crankcase where they are loaded with liquid oil, in the form of fine droplets. According to antipollution standards, these gases can not be released directly into the atmosphere, are then reinjected to the intake after being removed from their oil in order to avoid reducing the efficiency of combustion and thus increase toxic emissions.

Les gaz de blow-by sont donc un mélange air/gouttes d'huile, où les gouttes sont très diluées. Le filtrage des gaz de blow-by peut s'effectuer de manière connue par la décantation. Le procédé de décantation consiste à faire circuler les gaz chargés de particules dans un décanteur comportant une chambre munie de chicanes. L'huile recueillie par impaction est ensuite renvoyée essentiellement par gravité dans le bas du carter moteur au moyen de canules dont l'orifice d'entrée est souvent placé au fond du décanteur. Les gaz déshuilés sont quant à eux renvoyés dans le circuit d'admission d'air dans un collecteur d'admission disposé en amont du turbocompresseur.The blow-by gases are therefore an air / oil drop mixture, where the drops are very diluted. The filtering of the blow-by gases can be carried out in a known manner by decantation. The decantation process consists of circulating the particle-laden gases in a decanter comprising a chamber equipped with baffles. The oil collected by impaction is then returned essentially by gravity in the bottom of the crankcase by means of cannulas whose inlet is often placed at the bottom of the decanter. Deoiled gases are in turn sent back into the air intake circuit in an intake manifold disposed upstream of the turbocharger.

Cependant les différents flux de gaz d'admission présentent des caractéristiques différentes et Ils ne peuvent être mélangés l'un à l'autre de façon brutale en un seul point de collecte. Les gaz de blow-by et les gaz provenant du circuit EGR ne peuvent ainsi cohabiter aisément et notamment les résidus d'huile susceptibles d'être encore présents dans les gaz de blow-by ne doivent pas arriver à une entrée chaude de la vanne EGR sous risque de provoquer des incendies.However, the different inlet gas flows have different characteristics and they can not be mixed abruptly with one another at a single collection point. The blow-by gases and the gases coming from the EGR circuit can thus not easily coexist and in particular the oil residues that may still be present in the blow-by gases must not reach a hot inlet of the EGR valve. under threat of fire.

De manière connue, l'air frais est amené depuis un filtre à air par un conduit d'air généralement en plastique avec une base caoutchouc. L'EPDM est de manière connue utilisé pour la fabrication desdits conduits. Cependant, les gaz brulés provenant du circuit EGR ou du décanteur de blow-by sont en général incompatibles avec certaines bases caoutchouc utilisées dans la fabrication d'un conduit d'air. Ils ne peuvent donc pas être collectés dans le conduit d'air avec l'air frais. Lesdits gaz brulés doivent donc être introduits dans un collecteur rigide tel qu'un connecteur d'entrée du turbocompresseur. Ledit connecteur peut présenter une forme adaptée à améliorer la vitesse d'entrée des gaz dans le compresseur du turbocompresseur ainsi que le débit desdits gaz. De manière générale, la partie d'écoulement d'air frais dans ledit connecteur est de forme conique pour améliorer les vitesses du flux d'air frais à l'entrée dans le turbocompresseur.In known manner, the fresh air is supplied from an air filter by an air duct generally made of plastic with a rubber base. EPDM is in known manner used for the manufacture of said conduits. However, the burnt gases from the EGR circuit or the blow-by clarifier are generally incompatible with certain rubber bases used in the manufacture of an air duct. They can not be collected in the air duct with fresh air. Said burned gases must therefore be introduced into a rigid manifold such as an input connector of the turbocharger. Said connector may have a shape adapted to improve the gas inlet velocity in the compressor of the turbocharger and the flow rate of said gas. In general, the fresh air flow portion in said connector is conically shaped to improve the fresh air flow rates at the turbocharger inlet.

Les gaz brulés sont ainsi amenés par un conduit jusqu'au connecteur d'entrée de turbocompresseur où ils rejoignent l'air frais. De manière connue, les directions des deux flux de gaz brulés et d'air frais sont sensiblement orthogonales afin d'améliorer le mélange des gaz à l'entrée dans le turbocompresseur mais le flux des gaz brulés peut être important et empêcher le flux d'air frais d'arriver également au turbocompresseur ou tout du moins de réduire le flux d'air frais en créant une forte perte de charge. La géométrie également entraine une augmentation de la perte de charge du flux d'air frais. En effet, le flux de gaz recirculés débouche d'un conduit sensiblement cylindrique dans le connecteur d'entrée de turbocompresseur de forme conique. La rupture de paroi due au débouché de gaz recirculés peut alors provoquer des chocs et donc des pertes de charge. Il existe donc un besoin d'un connecteur d'entrée de turbocompresseur adapté à collecter les flux de gaz brulés, de gaz déshuilés et d'air frais présentant des caractéristiques différentes et connecté à l'entrée d'un turbocompresseur et autorisant un écoulement optimal desdits gaz mélangés jusqu'à l'entrée du turbocompresseur.The burned gases are thus led through a conduit to the turbocharger inlet connector where they join the fresh air. In known manner, the directions of the two flows of burnt gas and fresh air are substantially orthogonal in order to improve the mixing of the gases at the inlet to the turbocharger, but the flow of the burned gases can be significant and prevent the flow of Fresh air also arrives at the turbocharger or at least reduces the flow of fresh air creating a high pressure drop. Geometry also causes an increase in the pressure drop of the fresh air flow. Indeed, the flow of recirculated gas opens a substantially cylindrical conduit in the conical shaped turbocharger inlet connector. The wall rupture due to the outlet of recirculated gas can then cause shocks and therefore pressure drops. There is therefore a need for a turbocharger inlet connector adapted to collect the flows of burnt gas, deoiled gas and fresh air having different characteristics and connected to the inlet of a turbocharger and allowing an optimal flow said mixed gases to the inlet of the turbocharger.

La publication FR-A1-2950659 divulgue un connecteur d'entrée d'un turbocompresseur apte à collecter les flux de gaz d'un circuit de gaz brulés de recirculation EGR et d'air frais provenant d'un filtre à air. Ledit connecteur est apte à amener le flux de gaz provenant du circuit de recirculation de gaz brulés pour être diffusés dans le flux d'air frais avant la roue du compresseur. Ledit connecteur comporte un joint sensiblement conique comprenant des trous pour la diffusion des gaz brulés dans le flux d'air frais circulant selon l'axe du cône.The publication FR-A1-2950659 discloses an input connector of a turbocharger capable of collecting the flow of gas from a circuit of burnt EGR recirculated gas and fresh air from an air filter. Said connector is adapted to bring the flow of gas from the burnt gas recirculation circuit to be diffused into the fresh air flow before the compressor wheel. Said connector comprises a substantially conical seal comprising holes for the diffusion of the burnt gases in the flow of fresh air flowing along the axis of the cone.

Un inconvénient de cette publication est que le connecteur comprend une pièce supplémentaire qui est le joint conique issue d'une matière à base de caoutchouc, ce qui rend difficile la connexion avec le conduit des gaz déshuilés, notamment si l'encombrement est un facteur important.A disadvantage of this publication is that the connector comprises an additional piece which is the conical seal derived from a rubber-based material, which makes it difficult to connect the duct with de-oiled gases, especially if the bulk is an important factor. .

Un inconvénient est que ledit connecteur est donc complexe et couteux à produire.A disadvantage is that said connector is complex and expensive to produce.

Un des buts de l'invention est de remédier à ces inconvénients et l'invention a pour objet un connecteur d'entrée de turbocompresseur d'un moteur thermique apte à accueillir un flux de gaz de recirculation, un flux de gaz issus de décantation et un flux d'air frais et amener le mélange des flux vers le turbocompresseur en optimisant les circulations des gaz et en améliorant le mélange desdits gaz depuis leur point de mélange jusqu'à l'entrée du turbocompresseur.One of the aims of the invention is to overcome these drawbacks and the subject of the invention is a turbocharger input connector of a heat engine capable of receiving a flow of recirculating gas, a stream of gases coming from settling and a flow of fresh air and bring the mixture of flows to the turbocharger by optimizing the circulation of gases and improving the mixing of said gases from their mixing point to the inlet of the turbocharger.

L'invention concerne plus particulièrement un connecteur d'entrée de turbocompresseur de moteur thermique comprenant :

  • un conduit principal d'amenée d'air frais de révolution autour d'un axe primaire,
  • un conduit cylindrique d'amenée de gaz de recirculation dont l'axe est orthogonal à l'axe primaire et débouchant dans le conduit principal,
caractérisé en ce que le débouché du conduit des gaz de recirculation comprend une paroi de diffusion affleurant la surface de la paroi du conduit d'amenée d'air frais.The invention more particularly relates to a heat engine turbocharger inlet connector comprising:
  • a main duct for supplying fresh air of revolution around a primary axis,
  • a cylindrical conduit for supplying recirculating gas whose axis is orthogonal to the primary axis and opening into the main conduit,
characterized in that the outlet of the recirculation gas conduit comprises a diffusion wall flush with the surface of the wall of the fresh air supply duct.

De manière avantageuse, le débouché du conduit d'amenée des gaz recirculés comprend une paroi de diffusion affleurant la surface de la paroi du conduit principal afin de diminuer les obstacles à l'écoulement d'air frais et donc les pertes de charges. La paroi de diffusion permet également de diminuer l'impact de l'introduction des gaz recirculés dans le flux d'air frais.Advantageously, the outlet of the recirculated gas supply duct comprises a diffusion wall flush with the surface of the wall of the main duct to reduce the obstacles to the flow of fresh air and therefore the pressure drops. The diffusion wall also makes it possible to reduce the impact of the introduction of recirculated gases into the fresh air flow.

Selon d'autres caractéristiques de l'invention :

  • la paroi de diffusion comprend une grille de diffusion.
According to other features of the invention:
  • the diffusion wall comprises a diffusion grid.

De manière avantageuse, la paroi de diffusion comprend une grille afin de réduite l'impact de l'introduction des gaz recirculés dans le flux d'air frais en créant une perte de charge et en canalisant les gaz recirculés dans de multiples flux de sections réduites.

  • la paroi de diffusion comprend au moins une barre s'étendant selon une direction sensiblement orthogonale à l'axe primaire.
Advantageously, the diffusion wall comprises a grid in order to reduce the impact of the introduction of recirculated gases into the fresh air flow by creating a pressure drop and by channeling the recirculated gases into multiple streams of reduced sections. .
  • the diffusion wall comprises at least one bar extending in a direction substantially orthogonal to the primary axis.

De manière avantageuse, la paroi de diffusion comprend au moins une rainure et au moins une bosselure s'étendant parallèlement selon une même direction sensiblement orthogonale à l'axe primaire, ce qui permet de canaliser le flux des gaz recirculés. Lesdites au moins une rainure et au moins une bosselure comprennent à une extrémité un orifice débouchant dans le conduit d'amenée d'air, ce qui permet de bien diriger les gaz recirculés par rapport au flux d'air frais et d'améliorer le mélange des gesdits gaz recirculés et de l'air frais en créant un effet tourbillonnant ou « swirl » en anglais.

  • la paroi de diffusion comprend des orifices coniques.
Advantageously, the diffusion wall comprises at least one groove and at least one bead extending parallel in the same direction substantially orthogonal to the primary axis, which allows to channel the flow of recirculated gases. Said at least one groove and at least one embossing comprise at one end an orifice opening into the air supply duct, which makes it possible to direct the recirculated gases relatively to the flow of fresh air and to improve the mixing These recirculated gases and fresh air create a swirling effect in English.
  • the diffusion wall comprises conical orifices.

De manière avantageuse, la paroi de diffusion comporte des orifices coniques pour accroitre la vitesse des gaz recirculés afin d'améliorer leur mélange avec l'air frais avant l'entrée dans le turbocompresseur.

  • le diamètre des sections aval selon le sens d'écoulement des gaz recirculés des orifices coniques est compris dans la plage de 1 à 3mm.
Advantageously, the diffusion wall comprises conical orifices for increasing the speed of the recirculated gases in order to improve their mixing with the fresh air before entering the turbocharger.
  • the diameter of the downstream sections according to the flow direction of the recirculated gases of the conical orifices is in the range of 1 to 3 mm.

De manière avantageuse, le diamètre des sections aval selon le sens d'écoulement des gaz recirculés des orifices coniques est compris dans une plage de 1 à 3 mm, ce qui permet de réduire l'impact de l'introduction des gaz recirculés dans le flux d'air frais principal. L'espace formé entre lesdits orifices est d'autant plus important pour permettre un écoulement d'air frais.

  • les orifices sont répartis en périphérie de la paroi de diffusion entourant un orifice central.
Advantageously, the diameter of the downstream sections in the direction of flow of the recirculated gases of the conical orifices is in a range of 1 to 3 mm, which makes it possible to reduce the impact of the introduction of the recirculated gases into the flow. of fresh air. The space formed between said orifices is all the more important to allow a flow of fresh air.
  • the orifices are distributed at the periphery of the diffusion wall surrounding a central orifice.

De manière avantageuse, les orifices coniques sont répartis en périphérie de la paroi de diffusion et entourent un orifice central, pour permettre un meilleur mélanges des gaz brulés et de l'air frais.

  • le conduit cylindrique de gaz recirculés est inséré dans un canal creusé dans le connecteur.
Advantageously, the conical orifices are distributed around the periphery of the diffusion wall and surround a central orifice, to allow a better mixture of the burnt gases and the fresh air.
  • the cylindrical duct recirculated gas is inserted into a channel dug in the connector.

De manière avantageuse, le conduit cylindrique des gaz recirculés est inséré dans un canal creusé dans le connecteur afin de faciliter l'obtention du connecteur ave le conduit de gaz recirculés.

  • la paroi de diffusion est fixée solidaire à une extrémité aval du conduit cylindrique des gaz recirculés selon le sens de circulation des gaz recirculés.
Advantageously, the cylindrical duct of the recirculated gases is inserted into a channel dug in the connector to facilitate obtaining the connector with the recirculated gas duct.
  • the diffusion wall is secured to a downstream end of the cylindrical duct of recirculated gases in the direction of circulation of the recirculated gases.

De manière avantageuse, la paroi de diffusion est fixée solidaire à une extrémité aval du conduit des gaz recirculés, ce qui permet de faciliter l'obtention du connecteur. En effet, ladite paroi peut être fixée au préalable au conduit des gaz recirculés afin que celui-ci soit inséré dans le canal du connecteur, ce qui permet de diminuer les difficultés de positionnement de ladite paroi de diffusion à la paroi du conduit pricipal.

  • la paroi de diffusion et le conduit de gaz recirculés sont obtenus par moulage d'une pièce unique.
Advantageously, the diffusion wall is secured to a downstream end of the recirculated gas duct, which makes it easier to obtain the connector. In fact, said wall may be fixed beforehand to the recirculated gas duct so that it is inserted into the connector channel, which makes it possible to reduce the difficulties of positioning said diffusion wall at the wall of the main duct.
  • the diffusion wall and the recirculated gas duct are obtained by molding a single piece.

De manière avantageuse, la paroi de diffusion et le conduit de gaz recirculés sont d'une pièce issue de moulage pour faciliter l'obtention du connecteur et du conduit des gaz recirculés.

  • la paroi de diffusion et le conduit principal sont d'une pièce obtenue par moulage.
Advantageously, the diffusion wall and the recirculated gas duct are integrally molded to facilitate obtaining the connector and the recirculated gas duct.
  • the diffusion wall and the main duct are of a piece obtained by molding.

De manière avantageuse, la paroi de diffusion et le conduit principal sont d'une seule pièce obtenue par moulage. La paroi de diffusion est générée par l'obtention d'orifice dans la paroi du conduit primaire au débouché du conduit de gaz recirculés.

  • le conduit primaire est conique.
Advantageously, the diffusion wall and the main duct are in one piece obtained by molding. The diffusion wall is generated by obtaining an orifice in the wall of the primary duct at the outlet of the recirculated gas duct.
  • the primary duct is conical.

De manière préférentielle, la forme conique du conduit principal d'air frais permet d'accroitre la vitesse des gaz mélangés à l'entrée dans le turbocompresseur.Preferably, the conical shape of the main fresh air duct makes it possible to increase the speed of the mixed gases at the inlet to the turbocharger.

Brève description des figuresBrief description of the figures

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels :

  • -les figures 1 et 2 représentent une vue schématique panoramique du connecteur d'entrée de turbocompresseur.
  • -la figure 3 représente une vue schématique du connecteur selon un premier mode de réalisation.
  • -la figure 4 représente une vue schématique de coupe du connecteur selon le premier mode de réalisation.
  • -la figure 5 représente une vue schématique du connecteur selon un deuxième mode de réalisation.
  • --la figure 6 représente une vue schématique de côté du connecteur selon un troisième mode de réalisation.
Other features and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:
  • -the Figures 1 and 2 represent a panoramic schematic view of the turbocharger inlet connector.
  • -the figure 3 is a schematic view of the connector according to a first embodiment.
  • -the figure 4 is a schematic sectional view of the connector according to the first embodiment.
  • -the figure 5 is a schematic view of the connector according to a second embodiment.
  • --the figure 6 is a schematic side view of the connector according to a third embodiment.

Description détaillée des figuresDetailed description of the figures

Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires.In the following description, like reference numerals designate like parts or having similar functions.

Les termes amont et aval se réfèrent au sens d'écoulement des gaz avant l'entrée dans le turbocompresseur.The upstream and downstream terms refer to the flow direction of the gases before entering the turbocharger.

Comme représenté dans les figures 1 à 3, un connecteur d'entrée 10 est fixé à l'entrée d'un turbocompresseur (non représenté), ledit connecteur comprenant une entrée pour des flux d'air frais 11, une entrée pour des flux de gaz recirculés 12 issus d'un piquage depuis le circuit d'échappement des gaz de préférence en aval de systèmes de dépollution tels qu'un catalyseur ou un piège à oxyde d'azote, et une entrée pour des flux de gaz déshuilés 14 pris depuis un décanteur (non représenté). Les gaz recirculés et les gaz déshuilés contenant des substances susceptibles d'avoir des réactions avec des éléments en caoutchouc par exemple, ne peuvent donc pas être collectés dans un conduit souple tel qu'un conduit d'amenée d'air frais. Il est connu de collecter les flux des différents gaz dans un élément rigide tel qu'un connecteur d'entrée disposé à l'entrée d'un turbocompresseur.As shown in Figures 1 to 3 , an input connector 10 is attached to the inlet of a turbocharger (not shown), said connector comprising an inlet for fresh air flows 11, an inlet for recirculated gas flows 12 from a quilting from the exhaust gas circuit preferably downstream of pollution control systems such as a nitrogen oxide catalyst or trap, and an inlet for de-oiled gas streams 14 taken from a decanter (not shown). Recirculated gases and deoiled gases containing substances that may have reactions with rubber elements for example, can not therefore be collected in a flexible conduit such as a fresh air supply duct. It is known to collect the flows of the different gases in a rigid element such as an input connector disposed at the inlet of a turbocharger.

De manière connue, le connecteur d'entrée 10 est en matière rigide de préférence en thermoplastique. Il comprend une paroi d'appui 16 comportant des orifices de fixation 13 destinés à être traversés par des vis de fixation (non représentées) pour fixer solidaire ladite paroi d'appui 16 du connecteur d'entrée 10 contre l'entrée du turbocompresseur. Ladite paroi d'appui 16 comporte un orifice 18 débouchant dans l'entrée du turbocompresseur.In known manner, the input connector 10 is made of rigid material, preferably thermoplastic. It comprises a support wall 16 having fastening holes 13 to be traversed by fixing screws (not shown) for securing said support wall 16 of the input connector 10 against the inlet of the turbocharger. Said support wall 16 has an orifice 18 opening into the inlet of the turbocharger.

Le connecteur d'entrée 10 comprend un conduit principal 20 connecté à un circuit d'alimentation d'air frais en aval d'un filtre à air. Ledit conduit principal 20 est de manière préférentielle conique afin d'accroitre la vitesse des gaz à l'entrée dans le turbocompresseur.The input connector 10 comprises a main conduit 20 connected to a fresh air supply circuit downstream of an air filter. Said main duct 20 is preferably conical in order to increase the speed of the gases entering the turbocharger.

Le connecteur d'entrée comprend une connexion avec un circuit de gaz recirculés ou « EGR » pour Exhaust Gaz Recirculation en anglais issus d'un circuit d'échappement de gaz brulés. Ladite connexion comprend un canal d'amenée de gaz recirculés 21 sensiblement cylindrique creusé dans le connecteur 10 et débouchant de manière sensiblement orthogonale dans le conduit principal 20 afin d'améliorer le mélange des gaz à l'entrée dans le turbocompresseur. Ledit canal d'amenée est connecté avec un conduit d'amenée de gaz recirculés 22. L'axe dudit canal d'amenée X1 de gaz recirculés 21 est donc orthogonal à l'axe X du conduit principal 20.The input connector includes a connection with a recirculated gas circuit or "EGR" for Exhaust Gas Recirculation in English from a burnt gas exhaust system. Said connection includes a channel supplying substantially cylindrical recirculated gas 21 dug in the connector 10 and opening substantially orthogonal in the main conduit 20 to improve the mixing of the gases at the inlet into the turbocharger. Said supply channel is connected with a recirculated gas supply duct 22. The axis of said recirculated gas supply channel X1 is therefore orthogonal to the axis X of the main duct 20.

Le conduit d'amenée des gaz 22 recirculés comprend un élément tubulaire 23 de manière préférentielle coudé afin de diminuer l'encombrement du connecteur et comporte une extrémité amont tubulaire adaptée à être connectée à un conduit de gaz brulés (non représenté), et une extrémité aval sensiblement tubulaire adaptée à être insérée dans le canal d'amenée de gaz recirculés 21.The recirculated gas supply duct 22 comprises a tubular element 23 preferably bent in order to reduce the size of the connector and comprises a tubular upstream end adapted to be connected to a burned gas duct (not shown), and an end substantially tubular downstream adapted to be inserted into the recirculated gas supply channel 21.

Selon les figures 4 à 6, ledit débouché du canal d'amenée de gaz recirculés 21 dans le conduit principal 20 est masqué par une paroi de diffusion 25 qui affleure la surface de la paroi 24 dudit conduit principal, ce qui réduit les aspérités à la surface de la paroi du conduit principal avec pour effet de diminuer les turbulences à proximité dudit débouché . On entend par « affleurer » le fait que la forme de la paroi de diffusion 25 épouse sensiblement la forme de la paroi 24 du conduit principal 20 sans présenter des aspérités par rapport à la paroi 24 du conduit principal.According to Figures 4 to 6 , said outlet of the recirculated gas supply channel 21 in the main duct 20 is masked by a diffusion wall 25 which is flush with the surface of the wall 24 of said main duct, which reduces the asperities at the surface of the duct wall. main effect with the effect of reducing turbulence near said outlet. The term "flush" means that the shape of the diffusion wall 25 substantially matches the shape of the wall 24 of the main duct 20 without presenting asperities with respect to the wall 24 of the main duct.

Selon un premier mode de réalisation représenté en figures 3 et 4, la paroi de diffusion 25 comprend un orifice sensiblement conique principal 31 médian entouré par au moins un orifice auxiliaire sensiblement conique en périphérie 32 de la paroi de diffusion. Les axes des orifices coniques médian et en périphérie sont sensiblement parallèles entre eux et débouchent de façon sensiblement orthogonale à la paroi de diffusion 25 dans le conduit principal. Lesdits orifices coniques présentent une section rétrécie 33 tournée vers le conduit principal 20. Le diamètre de la section rétrécie 33 des orifices auxiliaires est sensiblement inférieur au diamètre la section rétrécie 33' de l'orifice principal médian 31. De manière préférentielle, le diamètre de ladite section rétrécie 33 des orifices auxiliaires en périphérie 32 est de l'ordre de 1mm tandis que le diamètre de la section rétrécie 33' de l'orifice principal 31 est de l'ordre de 3mm.According to a first embodiment represented in Figures 3 and 4 , the diffusion wall 25 comprises a substantially central main conical aperture 31 surrounded by at least one substantially conical auxiliary orifice at the periphery 32 of the diffusion wall. The axes of the median and peripheral conical orifices are substantially parallel to each other and open substantially orthogonal to the diffusion wall 25 in the main duct. Said conical orifices have a narrowed section 33 facing the main duct 20. The diameter of the narrowed section 33 of the auxiliary orifices is substantially smaller than the diameter of the narrowed section 33 'of the median main orifice 31. Preferably, the diameter of the narrowed section 33 said narrowed section 33 of the auxiliary orifices at the periphery 32 is of the order of 1 mm while the diameter of the narrowed section 33 'of the main orifice 31 is of the order of 3 mm.

Selon un deuxième mode de réalisation représenté en figure 5, la paroi de diffusion 25 comprend une grille 41 fixée à la paroi 24 du conduit principal 20, ladite grille comportant au moins une barre 42 s'étendant de manière préférentielle selon une direction orthogonale à l'axe du conduit principal et sensiblement parallèle à la paroi 24 du conduit principal 20. La figure 5 représente ainsi la paroi de diffusion 25 qui comprend une succession de barres 42 parallèles s'étendant selon un axe X2 orthogonal à l'axe X du conduit primaire 20. Les desdites barres peuvent être fixées à un cadre annulaire 43 dont le diamètre extérieur est sensiblement égal au diamètre du débouché du canal d'amenée 21 de gaz recirculés. Ledit cadre 43 est fixé à la paroi 24 du conduit principal par soudage ou collage.According to a second embodiment represented in figure 5 , the diffusion wall 25 comprises a grid 41 fixed to the wall 24 of the main duct 20, said grating comprising at least one bar 42 extending preferably in a direction orthogonal to the axis of the main duct and substantially parallel to the wall 24 of the main duct 20. The figure 5 thus represents the diffusion wall 25 which comprises a succession of parallel bars 42 extending along an axis X 2 orthogonal to the axis X of the primary duct 20. The said bars may be fixed to an annular frame 43 whose external diameter is substantially equal to the diameter of the outflow of the supply channel 21 of recirculated gas. Said frame 43 is fixed to the wall 24 of the main duct by welding or gluing.

Selon un troisième mode de réalisation représenté en figure 6, la paroi de diffusion comprend une grille 51 comportant une multitude d'orifices 52 alvéolaires de petit diamètre de l'ordre de 1 à 2 mm répartis sur toute la surface de ladite paroi de diffusion 25.According to a third embodiment represented in figure 6 , the diffusion wall comprises a grid 51 comprising a multitude of orifices 52 of small diameter of the order of 1 to 2 mm distributed over the entire surface of said diffusion wall 25.

Ladite paroi de diffusion 25 masque le débouché du conduit de gaz recirculés 21 dans le conduit principal 20 et la surface de ladite paroi de diffusion tournée vers le conduit principal est dans la continuité de la surface de la paroi 24 du conduit principal. La paroi de diffusion 25 présente ainsi une portion de surface courbe dans le prolongement de la surface de la paroi du conduit principal.Said diffusion wall 25 masks the outlet of the recirculated gas duct 21 in the main duct 20 and the surface of said diffusion wall facing the main duct is in continuity with the surface of the wall 24 of the main duct. The diffusion wall 25 thus has a portion of curved surface in the extension of the surface of the wall of the main duct.

Ladite paroi de diffusion peut être fixée au conduit cylindrique 22 de gaz recirculés ou être d'une pièce avec le connecteur d'entrée 10.Said diffusion wall can be fixed to the cylindrical duct 22 of recirculated gas or be integral with the inlet connector 10.

Ladite paroi de diffusion 25 peut ainsi être fixée à l'extrémité aval du conduit d'amenée 22 des gaz recirculés par collage ou soudage. Ledit conduit d'amenée des gaz recirculés est ensuite enfoncé dans le canal d'amenée 21 des gaz recirculés. De manière préférentielle, ledit conduit d'amenée 22 comporte une boursoufflure sur la surface cylindrique extérieure complémentaire avec une rainure creusée dans le canal d'amenée 21 de gaz recirculés afin de servir de détrompage.Said diffusion wall 25 can thus be fixed to the downstream end of the supply duct 22 of the recirculated gases by gluing or welding. Said conduit for supplying recirculated gases is then pressed into the supply channel 21 of the recirculated gases. Preferably, said supply conduit 22 comprises a blister on the outer cylindrical surface complementary with a groove dug in the supply channel 21 of recirculated gas to serve as a foolproof.

La paroi de diffusion 25 et le connecteur d'entrée 10 du turbocompresseur peuvent également être d'une pièce obtenue par moulage afin de diminuer le nombre d'opérations pour l'obtention du connecteur.The diffusion wall 25 and the inlet connector 10 of the turbocharger may also be of a piece obtained by molding in order to reduce the number of operations for obtaining the connector.

L'objectif de l'invention est atteint avec la paroi de diffusion qui comportant :

  • une surface tournée vers le conduit principal et sensiblement dans le prolongement de la paroi dudit conduit principal afin de réduire les aspérités à la paroi du conduit principal d'amenée d'air frais et donc des irrégularités d'écoulement de l'air frais,
  • des orifices de diffusion pour améliorer le mélange des gaz recirculés avec l'air frais et de réduire l'impact de l'entrée des gaz recirculés dans le conduit principal sur l'écoulement d'air frais.
The object of the invention is achieved with the diffusion wall which comprises:
  • a surface facing the main duct and substantially in the extension of the wall of said main duct in order to reduce the asperities in the wall of the main duct for supplying fresh air and thus irregularities in the flow of fresh air,
  • diffusion ports to improve the mixing of the recirculated gases with the fresh air and to reduce the impact of the recirculated gas inlet in the main duct on the fresh air flow.

Comme il va de soi, l'invention ne se limite pas aux seules formes d'exécution décrites ci-dessus à titre d'exemples, elle en embrasse au contraire toutes les variantes.As goes without saying, the invention is not limited to the embodiments described above as examples, it encompasses all variants.

Claims (10)

  1. Inlet connector (10) for a turbocharger of an internal combustion engine, comprising:
    - a main fresh air intake duct (20) that is axisymmetric about a primary axis,
    - a cylindrical recirculation gas duct (21) whose axis is orthogonal to the primary axis and which opens into the main duct (20) by an outlet,
    characterized
    in that the connector comprises a diffusion wall (25) having a surface in continuation of the surface of the wall (24) of the main duct (20) so as to mask the outlet of the recirculation gas duct (22) and to reduce turbulence close to the outlet, and in that said diffusion wall comprises a grille.
  2. Connector according to Claim 1, characterized in that the diffusion wall (25) comprises at least one bar extending in a direction essentially orthogonal to the primary axis.
  3. Connector according to Claim 1, characterized in that the diffusion wall (25) comprises conical orifices (31, 32) opening into the main duct.
  4. Connector according to Claim 3, characterized in that the diameter of the narrowed sections of the conical orifices is between 1 and 3 mm.
  5. Connector according to Claim 4, characterized in that the conical orifices (32) are distributed around the periphery of the diffusion wall (25) and surround a central median orifice (31).
  6. Connector (10) according to any one of Claims 1 to 5, characterized in that the cylindrical recirculated gas duct (22) is inserted into a channel (21) created in the connector (10).
  7. Connector (10) according to Claim 6, characterized in that the diffusion wall (25) is secured to a downstream end of the cylindrical recirculated duct (22), in the flow direction of the recirculated gases.
  8. Connector according to Claim 7, characterized in that the diffusion wall (25) and the recirculated gas duct (22) are obtained by moulding of a single part.
  9. Connector according to any one of Claims 1 to 6, characterized in that the diffusion wall (25) and the inlet connector (10) are in the form of a single part produced by the moulding.
  10. Connector according to any one of Claims 1 to 9, characterized in that the primary duct (20) is conical.
EP16151780.0A 2015-03-11 2016-01-19 Turbocharger input connector with egr gas diffuser Active EP3067547B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1551998A FR3033597B1 (en) 2015-03-11 2015-03-11 TURBOCHARGER INPUT CONNECTOR WITH EGR GAS DIFFUSER

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EP3067547A1 EP3067547A1 (en) 2016-09-14
EP3067547B1 true EP3067547B1 (en) 2018-05-23

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7172234B2 (en) * 2018-07-24 2022-11-16 マツダ株式会社 engine intake system
FR3091315B1 (en) * 2018-12-27 2020-12-25 Renault Sas Turbocharger inlet horn
WO2022214852A1 (en) * 2021-04-09 2022-10-13 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Supplying a mixture of air and exhaust gas to a compressor wheel of a compressor
FR3129989A1 (en) 2021-12-02 2023-06-09 Sogefi Filtration TURBOCHARGER INLET CONNECTOR, GATHERING RECIRCULATION GAS AND CRANKCASE GAS IN ONE END

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Publication number Priority date Publication date Assignee Title
US4235209A (en) * 1978-06-02 1980-11-25 Ibbott Jack Kenneth Device for introducing additional air into intake passage leading to combustion chamber
JP2548036Y2 (en) * 1991-01-25 1997-09-17 アイシン精機株式会社 Exhaust gas recirculation device
DE19809862A1 (en) * 1998-03-07 1999-09-09 Mann & Hummel Filter Exhaust gas recirculation device for an internal combustion engine
JP2007154675A (en) * 2005-11-30 2007-06-21 Toyota Motor Corp Internal combustion engine
DE102007035556A1 (en) * 2007-07-28 2009-01-29 Daimler Ag Mixing apparatus for adding exhaust gas recirculation flow into charge air flow of internal-combustion engine, has connecting tube running transverse through passage channel and connecting inlet opening with one of chambers
CN102187080A (en) * 2008-10-16 2011-09-14 博格华纳公司 Module integrating mixer and particulate separator into a common housing and an engine breathing system having the module
FR2950659A1 (en) 2009-09-30 2011-04-01 Renault Sa EXHAUST RECYCLING GAS DIFFUSER SEAL DEVICE

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FR3033597B1 (en) 2018-09-07
FR3033597A1 (en) 2016-09-16

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