EP3221574A1 - Turbocharger intake connector with egr and blow-by connections - Google Patents

Turbocharger intake connector with egr and blow-by connections

Info

Publication number
EP3221574A1
EP3221574A1 EP15771197.9A EP15771197A EP3221574A1 EP 3221574 A1 EP3221574 A1 EP 3221574A1 EP 15771197 A EP15771197 A EP 15771197A EP 3221574 A1 EP3221574 A1 EP 3221574A1
Authority
EP
European Patent Office
Prior art keywords
connector
gases
inlet
mixing chamber
side wall
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Withdrawn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
EP15771197.9A
Other languages
German (de)
French (fr)
Inventor
Bruno CHALMETTE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP3221574A1 publication Critical patent/EP3221574A1/en
Withdrawn legal-status Critical Current

Links

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
    • F02M35/10209—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
    • F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/06—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding lubricant vapours
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • 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
    • 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
    • F02M26/36—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for adding fluids other than exhaust gas to the recirculation passage; with reformers
    • 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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
    • 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
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10078—Connections of intake systems to the engine
    • F02M35/10085—Connections of intake systems to the engine having a connecting piece, e.g. a flange, between the engine and the air intake being foreseen with a throttle valve, fuel injector, mixture ducts or the like
    • 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
    • F02M35/10144—Connections of intake ducts to each other or to another device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention an air intake connector of a turbocharger of a motor vehicle engine.
  • the present invention more particularly relates to a turbocharger air intake connector grouping the connections with a flue gas recirculation circuit with a deoiled gas circuit from blow-by gas.
  • the present invention also relates to a heat engine comprising a turbocharger.
  • turbocharger in everyday language
  • gasoline or diesel gasoline or diesel
  • 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.
  • Said systems are also associated with pollution control systems and part of the hot exhaust gases is recovered for re-injection into the intake air stream, preferably before the turbocharger.
  • the flue gases are taken from the downstream exhaust circuit according to the flow direction of the gases of the pollution control systems which comprise 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:
  • 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 anti-pollution standards, these gases can not be discharged directly into the atmosphere, are then re-injected at 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 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 to the bottom of the crankcase by means of cannulas whose inlet is often placed at the bottom of the settler.
  • 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 flue gases from the EGR circuit or the blow-by clarifier are generally incompatible with some rubber bases used in the manufacture of the air duct. They must therefore be introduced into a rigid manifold such as a turbocharger inlet connector.
  • 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.
  • turbocharger inlet connector adapted to collect gases having different characteristics and connected to the inlet of a turbocharger.
  • EP-A1 -2781716 discloses an inlet connector of a turbocharger capable of collecting the gas flows of an EGR recirculated flue gas circuit and gas from blow-by gas after a gas phase. decantation and fresh air from an air filter. Said connector is adapted to bring the gas flow from the blow-by gases and the flow of gas from the flue gas recirculation circuit sealingly relative to each other to the compressor wheel. A disadvantage is that said connector is therefore complex and expensive to produce.
  • deoiled gases can undergo additional decantation in said connector and oil residues can then join the recirculated gas supply line to reach hot spots in said pipe, particularly in the vicinity of the EGR valve.
  • 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 reducing the risk of communication of oil residues of the gases from settling in the recirculation gas supply duct.
  • the invention more particularly relates to a turbocharger inlet connector comprising: a fresh air intake,
  • a mixing chamber in which the three inlets open, characterized in that the opening of the inlet of the deoiled gases is arranged at a level lower than the outlet of the recirculated gas inlet.
  • the gases from the settling phase and likely to contain oil residues are fed into the mixing chamber to the inlet of the turbocharger, at a level below the outlet of the gas inlet. recirculation in the same room. Gas Deoiled oil and oil residues are not likely to pass through the outlet of the recirculation gas inlet, in the recirculation circuit to come into contact with the hot wall of the EGR valve and generate risks of fire.
  • the mixing chamber is substantially of revolution surrounded by a side wall bordered by a support wall and the inlet opening of the fresh air.
  • the different flows of air and gas are collected in a chamber upstream of the inlet of the turbocharger to allow a homogeneous mixture of gases to allow a better efficiency of said turbocharger.
  • the inlet of the recirculating gases and the inlet of deoiled gases open into the side wall of the chamber transversely to the axis of said chamber.
  • the recirculated gas flow and de-oiled gas inlets each open into the side wall of the chamber to allow to direct the directions of the different flows.
  • the recirculated and deoiled gas flows into the mixing chamber substantially transverse to the flow of fresh air and are capable of generating a swirling movement of the mixture of gases and fresh air to improve the efficiency of said turbocharger.
  • the connector comprises a deoiled gas supply duct comprising an upstream end in the direction of flow of the deoiled gases connected with the inlet of the deoiled gases and a downstream end opening into the mixing chamber at a level lower than the outlet of the recirculated gas inlet.
  • the oil-free gases and oil residues that can still be transported with the deoiled gases are therefore not likely to pass via the inlet of the recirculation gases in the cooling circuit. recirculation to come into contact with the hot wall of the EGR valve and generate fire hazards.
  • the decanter being arranged in a known manner above the turbocharger, the conduit for supplying deoiled gases from said connector makes it possible to connect an intermediate duct connecting the decanter to the gas inlet of said connector in a simple manner.
  • the upstream end of the supply duct is disposed at a level higher than the downstream end of said supply duct.
  • the deoiled gas supply duct has an upstream end disposed higher than the opposite downstream end opening into the mixing chamber to drive said in a vertical flow from top to bottom and allow additional decantation subsequent to the flow. decantation step in the passage through the decanter.
  • the supply duct extends on an outer surface of the side wall of the mixing chamber.
  • the deoiled gas supply duct is mounted against an outer surface of the side wall of the mixing chamber, which allows easy manufacture of said inlet connector.
  • the connector comprises a shell adapted to be pressed against the side wall to form the supply duct.
  • the connector comprises a shell adapted to define the shapes of the supply duct. Said shell is pressed against the chamber side wall, which allows easy assembly of the connector.
  • the supply duct is bounded by ribs extending from the outer surface of the side wall of the mixing chamber.
  • the supply duct is bounded by ribs extending from the outer surface opposite to the mixing chamber, said ribs being easily obtained during molding of the connector.
  • each of said ribs comprises a welding sidewalk on which the shell is pressed.
  • each of the ribs comprises a weld sidewalk adapted to receive an edge of the shell which thus covers the conduit.
  • the shell is sealed against the sidewalk for easy assembly.
  • the manufacture of the connector is simple.
  • the mixing chamber comprises a channel dug in the side wall at the bottom of said mixing chamber.
  • a channel is arranged in the lower wall of the chamber and intended to collect oil residues that are likely to separate from the deoiled gases by the settling phase.
  • the oil residues collected in the channel are then brought to the lower casing of the engine containing the oil.
  • FIG 1 shows a panoramic schematic view of the turbocharger inlet connector.
  • FIG. 2 represents a schematic cross-sectional view of the connector.
  • FIG. 3 represents a schematic side view of the connector
  • FIG. 4 represents a schematic side view of the connector.
  • an input connector 10 is attached to the inlet of a turbocharger (not shown) to bring fresh air flows 1 1, recirculated gas flows 12 from a stitching from the downstream gas exhaust system preferably of pollution control systems such as a catalyst or nitrogen oxide trap, and deoiled gas streams 14 taken from a decanter (not shown).
  • Recirculated gases and deoiled gases contain substances that may react with rubber elements, for example. They can not be collected in an element in this type of material such as a flexible duct 40 fresh air supply.
  • the input connector 10 is therefore made of a rigid material, preferably made of thermoplastic material, and comprises a support wall 16 comprising fixing holes 13 intended to be traversed by fastening screws (not shown) for securing said input connector 10 by said support wall 16 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 mixing chamber 19 substantially of revolution surrounded by a side wall 20, which is bordered on an upstream side in the direction of flow of the air flow by a fresh air inlet 15 and a downstream side opposite the support wall 16 connected to the inlet of the turbocharger.
  • the side wall 20 is arranged substantially horizontally when the connector is fixed in the engine compartment of the vehicle; said connector then has an upper portion 37 and a lower portion 38 diametrically opposite as shown in Figure 2.
  • said fresh air inlet 15 comprises for example a male coupling element 22 on which is fitted the supply duct 40 of fresh air generally made of flexible material based on rubber.
  • the air inlet 15 is arranged facing the orifice 18 in the support wall 16 overlooking the inlet of the turbocharger.
  • the connector also comprises a recirculated gas inlet 17 from an exhaust gas recirculation circuit 12, which circuit is controlled by an EGR valve (not shown).
  • the recirculated gases can be substantially cooled in the recirculation circuit, however the EGR valve can be at substantially high temperatures.
  • the recirculated gas inlet 17 opens into the mixing chamber through an orifice 32e in the side wall 20 substantially transverse to the axis X of the mixing chamber.
  • the connector also comprises an inlet 21 of deoiled gases from a settling stage at the passage of a decanter (not shown).
  • said decanter is arranged at a level above the turbocharger and it is connected to the inlet connector of the turbocharger via an intermediate duct 35 whose downstream end in the direction of flow of the deoiled gases is stopped also above said input connector 10 of the turbocharger.
  • the de-oiled gas inlet 21 in the connector is thus arranged in the upper part of the side wall 20.
  • Said inlet 21 of the deoiled gases is disposed at an upstream end 30 of a feed duct 24 of the inlet connector and it may comprise a male element 23 intended to be sealed in the intermediate conduit 35 as shown in FIG.
  • the supply duct 24 then takes the deoiled gases to the mixing chamber 19.
  • the inlet of the deoiled gases opens into the mixing chamber 19 through an orifice 32b in the side wall 20 substantially transversely to the axis X of the mixing chamber.
  • the supply duct 24 thus runs along the side wall 20 of the mixing chamber from an upstream end 30 at the top of the connector to an opposite downstream end 31 arranged at a lower part of the connector and it opens into the mixing chamber via the 32b orifice dug in the lower part of the side wall 20.
  • the supply conduit 24 thus has a substantially vertical profile from the upstream end 30 to the downstream end 31 disposed at a level lower than said upstream end.
  • the deoiled gases are then entrained in a vertical flow from above and below to then open transversely to the axis X of the mixing chamber 19. Said flow with the changes of directions is likely to cause additional decantation of the deoiled gases.
  • the outflow of the de-oiled gases 32b into the mixing chamber 19 is arranged at a level lower than the outlet of the recirculated gas inlet 32e. Therefore, said deoiled gases and oil residues that can still contain the deoiled gases are not likely to enter the recirculated gas inlet 17 and reach the EGR valve that is likely to be worn at high temperatures.
  • the supply duct 24 extends on the outer surface 20e of the side wall 20, said outer surface 20e means in opposition to the inner surface facing the mixing chamber 19.
  • the conduit supply is bounded on said outer surface by ribs 27 extending radially from the outer surface 20e of the side wall. Said ribs thus delimit a cavity 33 extending substantially peripherally on the outer surface 20e of the side wall and said ribs each comprise a weld sidewalk 28 at their radial end.
  • the input connector comprises a shell 26 whose edges are substantially complementary to the sidewalks 28 of the ribs. Said shell 26 is pressed against the side wall 20 and its edges bear on the sidewalks welding.
  • the shell is then secured by sealing or bonding against the sidewalls 28 of the side wall.
  • the shell and the wall of the cavity then surround the supply duct 24 of deoiled gases.
  • the male connection element 25 with the intermediate duct 35 is formed in one piece with the shell 26.
  • the cavity can be simply dug in the side wall 20 and has edge weld sidewalks.
  • the shell 26 is pressed against the side wall, the edges of said shell resting on the weld sidewalks before being fixed against the side wall by welding or gluing.
  • a channel 36 is arranged in the lower part 38 of the mixing chamber 19.
  • the invention is not limited to the embodiments of this plug, described above as examples, it encompasses all variants.
  • the mixing chamber may be substantially conical and have a curvature in order to best meet the design constraints of the various elements of the engine in the engine compartment.
  • the trench 36 for collecting oil residues can be connected to the lower sump of the engine with the engine oil.

Landscapes

  • 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)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a heat engine turbocharger intake connector comprising: a fresh air intake, an intake for gases from the recirculation circuit, and an intake for de-oiled gases, characterised in that the connector comprises a supply line with an upstream end connected to the intake for blow-by gases and a downstream end arranged at a level below the intake for the recirculation gases.

Description

CONNECTEUR D'ENTREE DE TURBOCOMPRESSEUR AVEC  TURBOCOMPRESSOR INPUT CONNECTOR WITH
CONNEXIONS EGR ET BLOW-BY  EGR AND BLOW-BY CONNECTIONS
Domaine technique de l'invention Technical field of the invention
La présente invention un connecteur d'entrée d'air d'un turbocompresseur d'un moteur thermique de véhicule automobile. The present invention an air intake connector of a turbocharger of a motor vehicle engine.
La présente invention concerne plus particulièrement un connecteur d'entrée d'air de turbocompresseur regroupant les connexions avec un circuit de recirculation de gaz brûlés avec un circuit de gaz déshuilés provenant de gaz de blow-by. La présente invention concerne également un moteur thermique comprenant un turbocompresseur. The present invention more particularly relates to a turbocharger air intake connector grouping the connections with a flue gas recirculation circuit with a deoiled gas circuit from blow-by gas. The present invention also relates to a heat engine comprising a turbocharger.
Etat de la technique State 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 (dit « turbo », en langage courant) 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 (called "turbo", in everyday language) 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 compressor volumetric and 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 brûlés encore chauds est récupérée pour être réinjectée dans le flux d'air d'admission, de manière préférentielle avant le turbocompresseur. Les gaz brûlés 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 : Said systems are also associated with pollution control systems and part of the hot exhaust gases is recovered for re-injection into the intake air stream, preferably before the turbocharger. The flue gases are taken from the downstream exhaust circuit according to the flow direction of the gases of the pollution control systems which comprise 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:
-ralentir la vitesse de combustion via la diminution de la proportion d'oxygène dans les gaz ; -reducing the rate of combustion by decreasing the proportion of oxygen in the gases;
-augmenter la capacité thermique des gaz et donc diminuer leur température pendant la combustion ; 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'accroître les émissions toxiques. Les gaz de blow-by sont 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. 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. 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 anti-pollution standards, these gases can not be discharged directly into the atmosphere, are then re-injected at 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 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 to the bottom of the crankcase by means of cannulas whose inlet is often placed at the bottom of the settler. Deoiled gases are in turn sent back into the air intake circuit in an intake manifold disposed upstream of the turbocharger. 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 brûlés provenant du circuit EGR ou du décanteur de blow-by sont en général incompatibles avec certaines bases caoutchouc utilisées dans la fabrication du conduit d'air. Ils 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. 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 flue gases from the EGR circuit or the blow-by clarifier are generally incompatible with some rubber bases used in the manufacture of the air duct. They must therefore be introduced into a rigid manifold such as a turbocharger inlet connector. 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.
Il existe donc un besoin d'un connecteur d'entrée de turbocompresseur adapté à collecter des gaz présentant des caractéristiques différentes et connecté à l'entrée d'un turbocompresseur. There is therefore a need for a turbocharger inlet connector adapted to collect gases having different characteristics and connected to the inlet of a turbocharger.
La publication EP-A1 -2781716 divulgue un connecteur d'entrée d'un turbocompresseur apte à collecter les flux de gaz d'un circuit de gaz brûlés de recirculation EGR et de gaz provenant de gaz de blow-by après une phase de décantation et d'air frais provenant d'un filtre à air. Ledit connecteur est apte à amener le flux de gaz issus des gaz de blow-by et le flux de gaz provenant du circuit de recirculation de gaz brûlés de façon étanche l'un par rapport à l'autre jusqu'à la roue du compresseur. Un inconvénient est que ledit connecteur est donc complexe et coûteux à produire. The publication EP-A1 -2781716 discloses an inlet connector of a turbocharger capable of collecting the gas flows of an EGR recirculated flue gas circuit and gas from blow-by gas after a gas phase. decantation and fresh air from an air filter. Said connector is adapted to bring the gas flow from the blow-by gases and the flow of gas from the flue gas recirculation circuit sealingly relative to each other to the compressor wheel. A disadvantage is that said connector is therefore complex and expensive to produce.
Un autre inconvénient est que les gaz déshuilés peuvent subir une décantation supplémentaire dans ledit connecteur et des résidus d'huile peuvent alors rejoindre la conduite d'amenée des gaz recirculés pour atteindre des points chauds dans ladite conduite, notamment à proximité de la vanne EGR. Another disadvantage is that the deoiled gases can undergo additional decantation in said connector and oil residues can then join the recirculated gas supply line to reach hot spots in said pipe, particularly in the vicinity of the EGR valve.
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 réduisant les risques de communication de résidus d'huile des gaz issus de décantation dans le conduit d'amenée de gaz de recirculation. 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 reducing the risk of communication of oil residues of the gases from settling in the recirculation gas supply duct.
L'invention concerne plus particulièrement un connecteur d'entrée de turbocompresseur comprenant : -une entrée d'air frais, The invention more particularly relates to a turbocharger inlet connector comprising: a fresh air intake,
-une entrée de gaz issus du circuit de recirculation, a gas inlet from the recirculation circuit,
-une entrée de gaz déshuilés, an inlet of deoiled gases,
-une chambre de mélange dans laquelle débouchent les trois entrées, caractérisé en ce que le débouché de l'entrée des gaz déshuilés est agencé à un niveau plus bas que le débouché de l'entrée des gaz recirculés. a mixing chamber in which the three inlets open, characterized in that the opening of the inlet of the deoiled gases is arranged at a level lower than the outlet of the recirculated gas inlet.
De manière avantageuse, les gaz issus de la phase de décantation et susceptibles de contenir des résidus d'huile sont amenés dans la chambre de mélange vers l'entrée du turbocompresseur, à un niveau en-dessous du débouché de l'entrée des gaz de recirculation dans la même chambre. Les gaz déshuilés et les résidus d'huile ne sont donc pas susceptibles de passer via le débouché de l'entrée des gaz de recirculation, dans le circuit de recirculation pour entrer en contact avec la paroi chaude de la vanne EGR et de générer des risques d'incendie. Selon d'autres caractéristiques de l'invention : Advantageously, the gases from the settling phase and likely to contain oil residues are fed into the mixing chamber to the inlet of the turbocharger, at a level below the outlet of the gas inlet. recirculation in the same room. Gas Deoiled oil and oil residues are not likely to pass through the outlet of the recirculation gas inlet, in the recirculation circuit to come into contact with the hot wall of the EGR valve and generate risks of fire. According to other features of the invention:
-la chambre de mélange est sensiblement de révolution entourée par une paroi latérale bordée par une paroi d'appui et le débouché d'entrée de l'air frais. the mixing chamber is substantially of revolution surrounded by a side wall bordered by a support wall and the inlet opening of the fresh air.
Avantageusement, les différents flux d'air et de gaz sont collectés dans une chambre en amont de l'entrée du turbocompresseur afin de permettre un mélange homogène des gaz pour permettre une meilleure efficacité dudit turbocompresseur. Advantageously, the different flows of air and gas are collected in a chamber upstream of the inlet of the turbocharger to allow a homogeneous mixture of gases to allow a better efficiency of said turbocharger.
-l'entrée des gaz de recirculation et l'entrée de gaz déshuilés débouchent dans la paroi latérale de la chambre de façon transversale à l'axe de ladite chambre. the inlet of the recirculating gases and the inlet of deoiled gases open into the side wall of the chamber transversely to the axis of said chamber.
De façon avantageuse, les entrées des flux de gaz recirculés et de gaz déshuilés débouchent chacune dans la paroi latérale de la chambre pour permettre de bien diriger les directions des différents flux. De plus, les flux de gaz recirculés et déshuilés débouchent dans la chambre de mélange de façon sensiblement transversale au flux d'air frais et sont susceptibles de générer un mouvement tourbillonnaire du mélange des gaz et de l'air frais pour améliorer l'efficacité dudit turbocompresseur. Advantageously, the recirculated gas flow and de-oiled gas inlets each open into the side wall of the chamber to allow to direct the directions of the different flows. In addition, the recirculated and deoiled gas flows into the mixing chamber substantially transverse to the flow of fresh air and are capable of generating a swirling movement of the mixture of gases and fresh air to improve the efficiency of said turbocharger.
-le connecteur comporte un conduit d'amenée des gaz déshuilés comprenant une extrémité amont selon le sens d'écoulement des gaz déshuilés connectée avec l'entrée des gaz déshuilés et une extrémité aval débouchant dans la chambre de mélange à un niveau plus bas que le débouché de l'entrée des gaz recirculés. the connector comprises a deoiled gas supply duct comprising an upstream end in the direction of flow of the deoiled gases connected with the inlet of the deoiled gases and a downstream end opening into the mixing chamber at a level lower than the outlet of the recirculated gas inlet.
De manière avantageuse, les gaz déshuilés et les résidus d'huile qui peuvent encore être véhiculés avec les gaz déshuilés ne sont donc pas susceptibles de passer via l'entrée des gaz de recirculation dans le circuit de recirculation pour entrer en contact avec la paroi chaude de la vanne EGR et de générer des risques d'incendie. Advantageously, the oil-free gases and oil residues that can still be transported with the deoiled gases are therefore not likely to pass via the inlet of the recirculation gases in the cooling circuit. recirculation to come into contact with the hot wall of the EGR valve and generate fire hazards.
De manière avantageuse, le décanteur étant agencé de manière connue au-dessus du turbocompresseur, le conduit d'amenée de gaz déshuilés dudit connecteur permet de connecter un conduit intermédiaire reliant le décanteur à l'entrée des gaz dudit connecteur de manière simple. Advantageously, the decanter being arranged in a known manner above the turbocharger, the conduit for supplying deoiled gases from said connector makes it possible to connect an intermediate duct connecting the decanter to the gas inlet of said connector in a simple manner.
-l'extrémité amont du conduit d'amenée est disposée à un niveau plus haut que l'extrémité aval dudit conduit d'amenée. the upstream end of the supply duct is disposed at a level higher than the downstream end of said supply duct.
De manière avantageuse, le conduit d'amenée des gaz déshuilés comporte une extrémité amont disposée plus haut que l'extrémité aval opposée débouchant dans la chambre de mélange pour entraîner lesdits dans un écoulement vertical de haut en bas et permettre une décantation supplémentaire postérieure à l'étape de décantation dans le passage au travers du décanteur. -le conduit d'amenée s'étend sur une surface extérieure de la paroi latérale de la chambre de mélange. Advantageously, the deoiled gas supply duct has an upstream end disposed higher than the opposite downstream end opening into the mixing chamber to drive said in a vertical flow from top to bottom and allow additional decantation subsequent to the flow. decantation step in the passage through the decanter. the supply duct extends on an outer surface of the side wall of the mixing chamber.
De manière avantageuse, le conduit d'amenée de gaz déshuilés est rapporté contre une surface extérieure de la paroi latérale de la chambre de mélange, ce qui permet une fabrication aisée dudit connecteur d'entrée. -le connecteur comprend une coquille adaptée à être plaquée contre la paroi latérale pour former le conduit d'amenée. Advantageously, the deoiled gas supply duct is mounted against an outer surface of the side wall of the mixing chamber, which allows easy manufacture of said inlet connector. the connector comprises a shell adapted to be pressed against the side wall to form the supply duct.
De manière avantageuse, le connecteur comprend une coquille adaptée à définir les formes du conduit d'amenée. Ladite coquille est plaquée contre la paroi latérale de chambre, ce qui permet un assemblage aisé du connecteur. Advantageously, the connector comprises a shell adapted to define the shapes of the supply duct. Said shell is pressed against the chamber side wall, which allows easy assembly of the connector.
-le conduit d'amenée est borné par des nervures s'étendant depuis la surface extérieure de la paroi latérale de la chambre de mélange. the supply duct is bounded by ribs extending from the outer surface of the side wall of the mixing chamber.
De façon avantageuse, le conduit d'amenée est borné par des nervures s'étendant depuis la surface extérieure opposée à la chambre de mélange, lesdites nervures étant facilement obtenues lors du moulage du connecteur. -chacune desdites nervures comporte un trottoir de soudure sur lequel est plaquée la coquille. Advantageously, the supply duct is bounded by ribs extending from the outer surface opposite to the mixing chamber, said ribs being easily obtained during molding of the connector. each of said ribs comprises a welding sidewalk on which the shell is pressed.
De manière avantageuse, chacune des nervures comporte un trottoir de soudure adapté à recevoir un bord de la coquille qui recouvre ainsi le conduit. La coquille est plaquée de façon étanche contre le trottoir de soudure pour permettre un assemblage aisé. La fabrication du connecteur est donc simple. Advantageously, each of the ribs comprises a weld sidewalk adapted to receive an edge of the shell which thus covers the conduit. The shell is sealed against the sidewalk for easy assembly. The manufacture of the connector is simple.
-la chambre de mélange comporte une rigole creusée dans la paroi latérale en partie inférieure de ladite chambre de mélange. De façon avantageuse, une rigole est aménagée dans la paroi inférieure de la chambre et destinée à recueillir des résidus d'huile qui sont susceptibles de se séparer des gaz déshuilés par la phase de décantation. the mixing chamber comprises a channel dug in the side wall at the bottom of said mixing chamber. Advantageously, a channel is arranged in the lower wall of the chamber and intended to collect oil residues that are likely to separate from the deoiled gases by the settling phase.
De façon avantageuse, les résidus d'huile collectés dans la rigole sont ensuite amenés vers le carter inférieur du moteur contenant l'huile. Brève description des figures Advantageously, the oil residues collected in the channel are then brought to the lower casing of the engine containing the oil. Brief 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 : 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:
-la figure 1 représente une vue schématique panoramique du connecteur d'entrée de turbocompresseur. FIG 1 shows a panoramic schematic view of the turbocharger inlet connector.
-la figure 2 représente une vue schématique de coupe transversale du connecteur. FIG. 2 represents a schematic cross-sectional view of the connector.
-la figure 3 représente une vue schématique de côté du connecteur, -la figure 4 représente une vue schématique de côté du connecteur. Description détaillée des figures FIG. 3 represents a schematic side view of the connector, FIG. 4 represents a schematic side view of the connector. Detailed description of the figures
Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires. Les termes haut/bas ainsi que supérieur/inférieur sont relatifs à un axe vertical orthogonal au plan du véhicule passant par les axes des roues, une fois le connecteur fixé dans le compartiment moteur du véhicule. In the following description, like reference numerals designate like parts or having similar functions. The terms up / down as well as upper / lower are relative to a vertical axis orthogonal to the plane of the vehicle passing through the axes of the wheels, once the connector fixed in the engine compartment of the vehicle.
Comme représenté dans la figure 1 , un connecteur d'entrée 10 est fixé à l'entrée d'un turbocompresseur (non représenté) pour amener des flux d'air frais 1 1 , des flux de gaz recirculés 12 issus d'un piquage depuis le circuit d'échappement des gaz en aval de préférence de systèmes de dépollution tels qu'un catalyseur ou un piège à oxyde d'azote, et des flux de gaz déshuilés 14 pris depuis un décanteur (non représenté). Les gaz recirculés et les gaz déshuilés contiennent des substances susceptibles d'avoir des réactions avec des éléments en caoutchouc par exemple. Ils ne peuvent donc pas être collectés dans un élément dans ce type de matière tel qu'un conduit souple d'amenée 40 d'air frais. Le connecteur d'entrée 10 est donc en matière rigide de préférence en thermoplastique et 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 ledit connecteur d'entrée 10 par ladite paroi d'appui 16 contre l'entrée du turbocompresseur. Ladite paroi d'appui 16 comporte un orifice 18 débouchant dans l'entrée du turbocompresseur. As shown in FIG. 1, an input connector 10 is attached to the inlet of a turbocharger (not shown) to bring fresh air flows 1 1, recirculated gas flows 12 from a stitching from the downstream gas exhaust system preferably of pollution control systems such as a catalyst or nitrogen oxide trap, and deoiled gas streams 14 taken from a decanter (not shown). Recirculated gases and deoiled gases contain substances that may react with rubber elements, for example. They can not be collected in an element in this type of material such as a flexible duct 40 fresh air supply. The input connector 10 is therefore made of a rigid material, preferably made of thermoplastic material, and comprises a support wall 16 comprising fixing holes 13 intended to be traversed by fastening screws (not shown) for securing said input connector 10 by said support wall 16 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 une chambre de mélange 19 sensiblement de révolution entourée par une paroi latérale 20, laquelle est bordée d'un côté amont selon le sens d'écoulement du flux d'air par une entrée d'air frais 15 et d'un côté aval opposé par la paroi d'appui 16 connectée à l'entrée du turbocompresseur. La paroi latérale 20 est agencée sensiblement horizontalement lorsque le connecteur est fixé dans le compartiment moteur du véhicule ; ledit connecteur présente alors une partie supérieure 37 et une partie inférieure 38 diamétralement opposées tel que représenté dans la figure 2. The input connector 10 comprises a mixing chamber 19 substantially of revolution surrounded by a side wall 20, which is bordered on an upstream side in the direction of flow of the air flow by a fresh air inlet 15 and a downstream side opposite the support wall 16 connected to the inlet of the turbocharger. The side wall 20 is arranged substantially horizontally when the connector is fixed in the engine compartment of the vehicle; said connector then has an upper portion 37 and a lower portion 38 diametrically opposite as shown in Figure 2.
Selon la figure 4, ladite entrée d'air frais 15 comprend par exemple un élément de couplage maie 22 sur lequel est emboîté le conduit d'amenée 40 d'air frais généralement en matière souple à base de caoutchouc. De manière préférentielle, l'entrée d'air 15 est agencée en regard de l'orifice 18 dans la paroi d'appui 16 donnant sur l'entrée du turbocompresseur. Le connecteur comporte aussi une entrée de gaz recirculés 17 issus d'un circuit de recirculation 12 des gaz d'échappement, lequel circuit est contrôlé par une vanne EGR (non représentée). Les gaz recirculés peuvent être sensiblement refroidis dans le circuit de recirculation, toutefois la vanne EGR peut être à des températures sensiblement hautes. De manière préférentielle, comme représenté en figure 2, l'entrée de gaz recirculés 17 débouche dans la chambre de mélange par un orifice 32e dans la paroi latérale 20 de façon sensiblement transversale à l'axe X de la chambre de mélange. According to Figure 4, said fresh air inlet 15 comprises for example a male coupling element 22 on which is fitted the supply duct 40 of fresh air generally made of flexible material based on rubber. Preferably, the air inlet 15 is arranged facing the orifice 18 in the support wall 16 overlooking the inlet of the turbocharger. The connector also comprises a recirculated gas inlet 17 from an exhaust gas recirculation circuit 12, which circuit is controlled by an EGR valve (not shown). The recirculated gases can be substantially cooled in the recirculation circuit, however the EGR valve can be at substantially high temperatures. Preferably, as shown in Figure 2, the recirculated gas inlet 17 opens into the mixing chamber through an orifice 32e in the side wall 20 substantially transverse to the axis X of the mixing chamber.
Le connecteur comporte également une entrée 21 de gaz déshuilés issus d'une étape de décantation au passage d'un décanteur (non représenté). Généralement, ledit décanteur est agencé à un niveau au-dessus du turbocompresseur et il est relié au connecteur d'entrée du turbocompresseur par un conduit intermédiaire 35 dont l'extrémité aval selon le sens d'écoulement des gaz déshuilés est arrêtée également au-dessus dudit connecteur d'entrée 10 du turbocompresseur. L'entrée de gaz déshuilés 21 dans le connecteur est donc agencée en partie supérieure de la paroi latérale 20. Ladite entrée 21 des gaz déshuilés est disposée en une extrémité amont 30 d'un conduit d'amenée 24 du connecteur d'entrée et elle peut comporter un élément mâle 23 destiné à être emboîté de façon étanche dans le conduit intermédiaire 35 tel que représenté dans la figure 3. The connector also comprises an inlet 21 of deoiled gases from a settling stage at the passage of a decanter (not shown). Generally, said decanter is arranged at a level above the turbocharger and it is connected to the inlet connector of the turbocharger via an intermediate duct 35 whose downstream end in the direction of flow of the deoiled gases is stopped also above said input connector 10 of the turbocharger. The de-oiled gas inlet 21 in the connector is thus arranged in the upper part of the side wall 20. Said inlet 21 of the deoiled gases is disposed at an upstream end 30 of a feed duct 24 of the inlet connector and it may comprise a male element 23 intended to be sealed in the intermediate conduit 35 as shown in FIG.
Le conduit d'amenée 24 emmène ensuite les gaz déshuilés vers la chambre de mélange 19. The supply duct 24 then takes the deoiled gases to the mixing chamber 19.
Selon la figure 2, l'entrée des gaz déshuilés débouche dans la chambre de mélange 19 par un orifice 32b dans la paroi latérale 20 de façon sensiblement transversale à l'axe X de la chambre de mélange. Le conduit d'amenée 24 longe ainsi la paroi latérale 20 de la chambre de mélange depuis une extrémité amont 30 en partie haute du connecteur vers une extrémité aval 31 opposée disposée en une partie basse du connecteur et il débouche dans la chambre de mélange par l'orifice 32b creusé dans la partie basse de la paroi latérale 20. Le conduit d'amenée 24 présente donc un profil sensiblement vertical depuis l'extrémité amont 30 vers l'extrémité aval 31 disposée à un niveau plus bas que ladite extrémité amont. Les gaz déshuilés sont alors entraînés dans un écoulement vertical de haut et bas pour déboucher ensuite transversalement à l'axe X de la chambre de mélange 19. Ledit écoulement avec les changements de directions est susceptible de provoquer une décantation supplémentaire des gaz déshuilés. According to FIG. 2, the inlet of the deoiled gases opens into the mixing chamber 19 through an orifice 32b in the side wall 20 substantially transversely to the axis X of the mixing chamber. The supply duct 24 thus runs along the side wall 20 of the mixing chamber from an upstream end 30 at the top of the connector to an opposite downstream end 31 arranged at a lower part of the connector and it opens into the mixing chamber via the 32b orifice dug in the lower part of the side wall 20. The supply conduit 24 thus has a substantially vertical profile from the upstream end 30 to the downstream end 31 disposed at a level lower than said upstream end. The deoiled gases are then entrained in a vertical flow from above and below to then open transversely to the axis X of the mixing chamber 19. Said flow with the changes of directions is likely to cause additional decantation of the deoiled gases.
Selon la figure 2, le débouché des gaz déshuilés 32b dans la chambre de mélange 19 est agencé à un niveau plus bas que le débouché de l'entrée des gaz recirculés 32e. De ce fait, lesdits gaz déshuilés ainsi que les résidus d'huile que peuvent encore contenir les gaz déshuilés ne sont pas susceptibles de pénétrer dans l'entrée des gaz recirculés 17 et parvenir jusqu'à la vanne EGR qui est susceptible d'être portée à des hautes températures. According to FIG. 2, the outflow of the de-oiled gases 32b into the mixing chamber 19 is arranged at a level lower than the outlet of the recirculated gas inlet 32e. Therefore, said deoiled gases and oil residues that can still contain the deoiled gases are not likely to enter the recirculated gas inlet 17 and reach the EGR valve that is likely to be worn at high temperatures.
Selon les figures 2 à 4, le conduit d'amenée 24 s'étend sur la surface extérieure 20e de la paroi latérale 20, ladite surface extérieure 20e s'entend par opposition à la surface intérieure tournée vers la chambre de mélange 19. Le conduit d'amenée est borné sur ladite surface extérieure par des nervures 27 s'étendant radialement depuis la surface extérieure 20e de la paroi latérale. Lesdites nervures délimitent ainsi une cavité 33 s'étendant sensiblement en périphérie sur la surface extérieure 20e de la paroi latérale et lesdites nervures comprennent chacune un trottoir de soudure 28 à leur extrémité radiale. Selon la figure 3, le connecteur d'entrée comporte une coquille 26 dont les bordures sont sensiblement complémentaires aux trottoirs de soudure 28 des nervures. Ladite coquille 26 est plaquée contre la paroi latérale 20 et ses bordures viennent en appui sur les trottoirs de soudure. La coquille est ensuite fixée par soudure étanche ou collage contre les trottoirs de soudure 28 de la paroi latérale. La coquille et la paroi de la cavité entourent alors le conduit d'amenée 24 des gaz déshuilés. Selon le mode de réalisation en figure 3, l'élément mâle de connexion 25 avec le conduit intermédiaire 35 est formé d'une pièce avec la coquille 26. According to Figures 2 to 4, the supply duct 24 extends on the outer surface 20e of the side wall 20, said outer surface 20e means in opposition to the inner surface facing the mixing chamber 19. The conduit supply is bounded on said outer surface by ribs 27 extending radially from the outer surface 20e of the side wall. Said ribs thus delimit a cavity 33 extending substantially peripherally on the outer surface 20e of the side wall and said ribs each comprise a weld sidewalk 28 at their radial end. According to Figure 3, the input connector comprises a shell 26 whose edges are substantially complementary to the sidewalks 28 of the ribs. Said shell 26 is pressed against the side wall 20 and its edges bear on the sidewalks welding. The shell is then secured by sealing or bonding against the sidewalls 28 of the side wall. The shell and the wall of the cavity then surround the supply duct 24 of deoiled gases. According to the embodiment in FIG. 3, the male connection element 25 with the intermediate duct 35 is formed in one piece with the shell 26.
Selon un autre mode de réalisation non représenté, la cavité peut être simplement creusée dans la paroi latérale 20 et comporte des trottoirs de soudure en bordure. La coquille 26 est mise en appui contre la paroi latérale, les bords de ladite coquille en appui sur les trottoirs de soudure avant d'être fixé contre la paroi latérale par soudure ou collage. According to another embodiment not shown, the cavity can be simply dug in the side wall 20 and has edge weld sidewalks. The shell 26 is pressed against the side wall, the edges of said shell resting on the weld sidewalks before being fixed against the side wall by welding or gluing.
Pour prendre en compte la décantation supplémentaire, une rigole 36 est aménagée dans la partie basse 38 de la chambre de mélange 19. Ainsi l'huile restante après la décantation dans le décanteur et séparée des gaz déshuilés par le passage dans le conduit d'amenée 24 peut être collectée par gravité dans ladite rigole 36. To take into account the additional settling, a channel 36 is arranged in the lower part 38 of the mixing chamber 19. Thus the oil remaining after settling in the settling tank and separated from the deoiled gases through the passage in the feed duct 24 can be collected by gravity in said ditch 36.
Comme il va de soi, l'invention ne se limite pas aux seules formes d'exécution de cette prise, décrites ci-dessus à titre d'exemples, elle en embrasse au contraire toutes les variantes. C'est ainsi notamment que la chambre de mélange peut être sensiblement conique et présenter une courbure afin de répondre au mieux aux contraintes d'aménagement des différents éléments du moteur dans le compartiment moteur. La rigole 36 de collecte des résidus d'huile peut être connectée au carter inférieur du moteur avec l'huile du moteur. As goes without saying, the invention is not limited to the embodiments of this plug, described above as examples, it encompasses all variants. Thus, in particular, the mixing chamber may be substantially conical and have a curvature in order to best meet the design constraints of the various elements of the engine in the engine compartment. The trench 36 for collecting oil residues can be connected to the lower sump of the engine with the engine oil.

Claims

Revendications claims
Connecteur d'entrée (10) de turbocompresseur de moteur thermique comprenant : An input connector (10) for a thermal engine turbocharger comprising:
-une entrée d'air frais (15),  an inlet of fresh air (15),
-une entrée de gaz issus du circuit de recirculation (17),  a gas inlet coming from the recirculation circuit (17),
-une entrée de gaz déshuilés (21 ), an inlet of deoiled gases (21),
-une chambre de mélange (19) dans laquelle débouchent les trois entrées,  a mixing chamber (19) in which the three inlets open,
Caractérisé en ce que le débouché de l'entrée des gaz déshuilés (32b) est agencé à un niveau plus bas que le débouché de l'entrée des gaz recirculés (32e).  Characterized in that the outlet of the deoiled gas inlet (32b) is arranged at a lower level than the outlet of the recirculated gas inlet (32e).
Connecteur (10) selon la revendication 1 , caractérisé en ce que la chambre de mélange (19) est sensiblement de révolution entourée par une paroi latérale (20) bordée par une paroi d'appui (16) et l'entrée de l'air frais (15).  Connector (10) according to claim 1, characterized in that the mixing chamber (19) is substantially of revolution surrounded by a side wall (20) bordered by a support wall (16) and the air inlet fresh (15).
Connecteur selon la revendication 2, caractérisé en ce que l'entrée des gaz de recirculation (17) et l'entrée de gaz déshuilés (21 , 32b) débouchent dans la paroi latérale (20) de la chambre de mélange (19) de façon transversale à l'axe (X) de ladite chambre.  Connector according to claim 2, characterized in that the inlet of the recirculating gases (17) and the deoilized gas inlet (21, 32b) open into the side wall (20) of the mixing chamber (19) so as to transverse to the axis (X) of said chamber.
Connecteur (10) selon la revendication 2 ou 3, caractérisé en ce que le connecteur comporte un conduit d'amenée (24) des gaz déshuilés comprenant une extrémité amont (30) selon le sens d'écoulement des gaz déshuilés connectée avec l'entrée des gaz déshuilés et une extrémité aval (31 ) débouchant dans la chambre de mélange (19) à un niveau plus bas que le débouché de l'entrée des gaz de recirculation (17). Connector (10) according to claim 2 or 3, characterized in that the connector comprises a supply duct (24) of deoiled gases comprising an upstream end (30) in the direction of flow of deoiled gases connected with the inlet de-oiled gases and a downstream end (31) opening into the mixing chamber (19) at a level lower than the outlet of the recirculation gas inlet (17).
Connecteur (10) selon l'une quelconque des revendications 2 à 4, caractérisé en ce que l'extrémité amont (30) du conduit d'amenée (24) est agencée à un niveau plus haut que l'extrémité aval (31 ) dudit conduit d'amenée Connecteur (10) selon l'une quelconque des revendications 2 à 5, caractérisé en ce que le conduit d'amenée (24) s'étend sur une surface extérieure (20e) de la paroi latérale (20) de la chambre de mélange (19). Connector (10) according to any one of claims 2 to 4, characterized in that the upstream end (30) of the supply duct (24) is arranged at a level higher than the downstream end (31) of said supply duct Connector (10) according to any one of claims 2 to 5, characterized in that the supply duct (24) extends on an outer surface (20e) of the side wall (20) of the mixing chamber ( 19).
Connecteur (10) selon l'une quelconque des revendications 2 à 6, caractérisé en ce que le connecteur comprend une coquille (26) adaptée à être plaquée contre la paroi latérale (20) pour former le conduit d'amenée (24).  Connector (10) according to any one of claims 2 to 6, characterized in that the connector comprises a shell (26) adapted to be pressed against the side wall (20) to form the supply duct (24).
Connecteur (10) selon l'une quelconque des revendications 2 à 7, caractérisé en ce que le conduit d'amenée (24) est borné par des nervures (27) s'étendant depuis la surface extérieure (20e) de la paroi latérale (20) de la chambre de mélange (19).  Connector (10) according to any one of claims 2 to 7, characterized in that the supply duct (24) is bounded by ribs (27) extending from the outer surface (20e) of the side wall ( 20) of the mixing chamber (19).
Connecteur (10) selon la revendication 8, caractérisé en ce que chacune desdites nervures (27) comporte un trottoir de soudure (28) sur lequel est plaquée la coquille (26). Connector (10) according to claim 8, characterized in that each of said ribs (27) comprises a welding sidewalk (28) on which is pressed the shell (26).
Connecteur selon l'une quelconque des revendications 1 à 9, caractérisé la chambre de mélange (19) comporte une rigole (34) creusée dans la paroi latérale (20) en partie inférieure (38) de ladite chambre de mélange.  Connector according to any one of claims 1 to 9, characterized the mixing chamber (19) comprises a channel (34) hollowed in the side wall (20) in the lower part (38) of said mixing chamber.
EP15771197.9A 2014-11-19 2015-09-10 Turbocharger intake connector with egr and blow-by connections Withdrawn EP3221574A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1461170A FR3028555B1 (en) 2014-11-19 2014-11-19 TURBOCHARGER INPUT CONNECTOR WITH EGR AND BLOW-BY CONNECTIONS
PCT/FR2015/052405 WO2016079390A1 (en) 2014-11-19 2015-09-10 Turbocharger intake connector with egr and blow-by connections

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Publication Number Publication Date
EP3221574A1 true EP3221574A1 (en) 2017-09-27

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EP15771197.9A Withdrawn EP3221574A1 (en) 2014-11-19 2015-09-10 Turbocharger intake connector with egr and blow-by connections

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EP (1) EP3221574A1 (en)
FR (1) FR3028555B1 (en)
WO (1) WO2016079390A1 (en)

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US11624343B2 (en) * 2019-11-25 2023-04-11 Zoom Zoom Parts Llc System for enhancing performance of carburetor engine and peripherals of an all-terrain vehicle

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DE69724180T2 (en) * 1996-05-14 2004-04-01 Denso Corp., Kariya Exhaust gas recirculation device
DE10036128A1 (en) * 2000-07-25 2002-02-07 Volkswagen Ag Internal combustion engine and method for active ventilation of the cylinder crankcase thereof
US7204241B2 (en) * 2004-08-30 2007-04-17 Honeywell International, Inc. Compressor stage separation system
FR2922960B1 (en) * 2007-10-24 2014-01-31 Valeo Systemes Thermiques SYSTEM FOR REINJECTING CARTER GAS AND HEAT EXCHANGER IMPLEMENTED IN SAID SYSTEM
FR2939478B1 (en) * 2008-12-04 2014-10-24 Mann & Hummel Gmbh INTERNAL COMBUSTION ENGINE EQUIPPED WITH A TURBOCHARGER AND AN EXHAUST GAS RECYCLING CIRCUIT
US7886727B2 (en) * 2009-05-26 2011-02-15 Ford Global Technologies, Llc Variable venturi system and method for engine
FR2999251B1 (en) * 2012-12-06 2015-01-02 Coutier Moulage Gen Ind DEVICE FOR SUPPLYING AN INTERNAL COMBUSTION ENGINE COMPRESSOR AND AIR INTAKE CONDUCT COMPRISING SUCH A FEEDING DEVICE

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Also Published As

Publication number Publication date
FR3028555A1 (en) 2016-05-20
FR3028555B1 (en) 2020-01-03
WO2016079390A1 (en) 2016-05-26

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