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WO2007039700A1 - Device for cooling recirculated gases - Google Patents

Device for cooling recirculated gases Download PDF

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Publication number
WO2007039700A1
WO2007039700A1 PCT/FR2006/050973 FR2006050973W WO2007039700A1 WO 2007039700 A1 WO2007039700 A1 WO 2007039700A1 FR 2006050973 W FR2006050973 W FR 2006050973W WO 2007039700 A1 WO2007039700 A1 WO 2007039700A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooler
ducts
exchanger
duct
outlet
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.)
Ceased
Application number
PCT/FR2006/050973
Other languages
French (fr)
Inventor
Gilles Hamadani
Franck Levy
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
Priority to AT06831259T priority Critical patent/ATE535701T1/en
Priority to EP06831259A priority patent/EP1934458B1/en
Publication of WO2007039700A1 publication Critical patent/WO2007039700A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on 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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/71—Multi-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • 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
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass

Definitions

  • the present invention relates to recirculated gas coolers, called EGR gas, or EGR gas (exhaust gas recirculation).
  • EGR gas exhaust gas recirculation
  • EGR circuit exhaust gas recirculation of exhaust gas in the intake
  • specific coolers for these gases makes it possible to further increase this depollution.
  • a major problem is that the recirculation of the exhaust gas leads to a significant fouling of the components that are in this EGR circuit. This is why we can proceed to cleaning / cleaning sessions by fully opening the EGR valve (the EGR valve regulates the flow of EGR gas that starts at the intake) when the engine is on a specific operating zone.
  • This method described in patent application FR2833653, makes it possible to thermally eliminate the deposits accumulating in the EGR circuit.
  • Document J P20043400099 relates to an EGR system of an internal combustion engine comprising two groups of separate cylinders.
  • This EGR system has the particularity of being able to reverse the flow of exhaust gas flowing in the duct, and consequently in the coolers, by modifying the pressures of the exhaust gases between the first and the second group of cylinders.
  • a major disadvantage is that it is necessary to have two groups of separate cylinders in which the exhaust gas pressures can be modified.
  • the invention aims to solve the problem of fouling EGR coolers.
  • the invention proposes for this purpose a recirculated gas cooler defining an inlet duct and a recirculated gas outlet duct and having a heat exchanger configured in U with an inlet duct and an outlet duct.
  • the cooler comprises a pair of crossed ducts for bypassing the recirculated gases and a mobile distributor between a first position allowing the recirculated gas flow to pass through the exchanger in one direction, and a second position allowing the flow of gas recirculated to cross the exchanger in the opposite direction.
  • FIGS. 1, 2, 3, 4 , 5, 6 and 7 show a first embodiment.
  • - Figures 8, 9, 10 and 1 1 show a second embodiment.
  • the cooler 1 of recirculated gas comprises a heat exchanger 2 configured in a U, that is to say it comprises inlet ducts e2 and outlet s2 which open substantially on the same side.
  • the cooler 1 defines an inlet duct e1 and an outlet duct if recirculated gas.
  • the cooler 1 comprises an additional pair of crossed conduits for bypassing the recirculated gases and a distributor.
  • the distributor is in communication with the inlet ducts E1 output e2 of the cooler, the crossed bypass ducts, and the inlet ducts e2 and outlet s2 of the exchanger 2.
  • the distributor is movable between two positions: the first position allows the flow of recirculated gas through the exchanger 2 in one direction (said normal direction), and the second position allows the flow of recirculated gas through the exchanger 2 in the opposite direction. According to a first embodiment shown in FIGS.
  • the distributor is a slidable distributor 5 between a first position allowing the recirculated gas flow to pass through the exchanger 2 in one direction (in the normal sense), and a second position allowing the flow of recirculated gas to pass through the exchanger 2 in the opposite direction.
  • the drawer 5 can be moved by any actuator known to those skilled in the art.
  • the slide 5 slides in an enclosure 4. It has two pairs of communication ports (5a, 5d, 5b, 5c) (FIG.
  • the orifices (5a, 5d, 5b, 5c) of each pair are each capable of being in communication with one of the two ducts (e2, s2) of the heat exchanger (2).
  • the orifices (e2, s2) of the heat exchanger 2 may be elongated to allow this communication.
  • the orifices 5a and 5d which are offset in height can communicate according to the position of the drawer 5 with the outlet duct s2 of the exchanger 2, and the orifices 5b and 5c which are also offset in height can communicate according to the position of the drawer 5 with the inlet duct e2 of the exchanger 2.
  • the inlet ducts e1 and outlet si of the cooler and the two crossed bypass ducts (de1, ds1) are arranged so as to be able to communicate with an orifice (5a, 5d, 5b, 5c) of the drawer 5.
  • the crossed ducts of branches (de1, ds1) are upstream of the drawer 5.
  • these crossed ducts downstream of the drawer on the input ducts e2 and outlet s2 of the exchanger 2, and adapt the inlet ducts e1 and outlet if cooler 1 to give them an elongated shape of the type of the ducts of the exchanger 2.
  • the crossed bypass ducts serve to guide the flow of EGR gas in the opposite direction, they are connected to the inlet ducts e1 and outlet if cooler 1; the bypass duct de1 is connected to the inlet duct e1 and returns the EGR gas side of the outlet duct if; the ds1 bypass duct is connected to the outlet duct if and sends the gases EG R on the side of the inlet duct e1.
  • the crossed ducts (de1, ds1) of branches are deactivated. Only the ducts e1 and si are activated: the inlet duct e1 of the cooler 1 communicates with the orifice 5b of the spool 5 and the flow of gas goes into the inlet duct e2 of the exchanger 2. The duct if the cooler 1 communicates with the orifice 5d of the spool 5, and the EGR gas flow arrives from the outlet pipe s2 of the exchanger 2 and goes to the outlet duct if cooler r 1.
  • the inlet bypass duct de1 of the cooler 1 communicates with the orifice 5a of the drawer 5.
  • the duct output bypass ds1 of the cooler 1 communicates with the orifice 5c of the spool 5.
  • the flow of EGR gas arrives via the inlet duct e1 of the cooler 1, passes through the inlet bypass duct de1, passes through the orifice 5a, passes through the inlet duct e2 of the exchanger 2 and then through the outlet duct s2, then passes through the orifice 5c of the spool 5, passes through the outlet bypass duct ds1 and leaves the cooler 1 by the outlet duct if.
  • the cooler 1 according to the invention may also comprise a bypass 6 of the exchanger 2.
  • This bypass 6 is arranged, in this first embodiment, upstream of the spool valve 5.
  • I l allows to connect the inlet ducts e1 and outlet if cooler 1.
  • the bypass 6 defines for this purpose a connecting pipe which comprises a valve or a shutter.
  • the distributor is a rotary ball valve 7 between a first position allowing the stream of recirculated gases to pass through the exchanger (2) in one direction, and a second position allowing the flow of recirculated gas to cross the exchanger (2) in the opposite direction.
  • the cooler 1 comprises an inlet duct e1 and an outlet duct 11 if which open on the rotary plug 7.
  • An additional duct e '1 connected to the conduit e1 opens on the 7.
  • another additional duct is connected to the duct if open on the plug 7.
  • the exchanger 2 comprises an inlet duct e2 and an outlet duct s2.
  • the exchanger 2 also comprises two crossed bypass conduits de2 and ds2.
  • the crossed bypass ducts serve to guide the flow of EGR gas in the opposite direction;
  • the inlet bypass duct de2 is connected to the inlet duct e2 and returns the EGR gas side of the outlet duct s2;
  • the outlet bypass duct ds2 is connected to the outlet duct s2 and returns the EGR gas from the side of the inlet duct e2.
  • the plug 7 has the shape of a cylindrical piece which defines two parallel transverse bores 8 and 9.
  • the axes of the bores 8 and 9 are arranged on the same longitudinal plane of the plug 7.
  • the transverse bores (8, 9) are capable of communicating on the one hand the input ducts (e1, e2) between them and the output ducts (s1, s2) between them, and on the other hand the additional ducts (é1, s'1) with the crossed bypass ducts (d ⁇ 2, ds2)
  • the axes of the inlet ducts e1, é1 opening on the plug 7, the axes of the inlet ducts e2, ds2 opening on the plug 7, and the axis of the bore 8 are located substantially in the same radial plane to the plug 7.
  • the ends of the ducts e1, e'1, e2, ds2 are distributed so that the bore 8 connects on the one hand the duct e1 and the duct e2, and on the other hand the duct e1 and the duct ds2.
  • the dispenser may comprise a third position making it possible to pass the exchanger (2).
  • the plug 7 defines for this purpose a longitudinal groove 10 of a length for connecting the ducts e1 and si. When the plug 7 is in this position, the holes 8 and 9 do not communicate with any of the conduits.
  • An advantage of the present invention is that it is possible, during a chilling phase of the cooler, to reverse the flow of EGR gas in order to completely clean the exchanger. Another advantage is that one can standardize the natural fouling of the exchanger, alternating the flow of EGR gas in the exchanger. Another advantage is that controlled cooling of the EGR gases can be done by controlling the position of the plug 7 in the vicinity of the first and second positions. To achieve this, the groove 10 made in the plug 7 is disposed near the bores 8 and 9. Part of the flow can then pass through the exchanger 2 in the normal or inverted direction, and the other passes directly through the groove 10 to stand out, the sum of the two parts guaranteeing a flow of gas independent of the position of the plug 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention relates to a device (1) for cooling recirculated gases. The inventive device defines an inlet duct (e1) and an outlet duct (s1) for recirculated gases and comprises a U-shaped heat exchanger (2) consisting of an inlet duct (e2) and an outlet duct (s2). According to the invention, the cooling device comprises a pair intersecting ducts for bypassing the recirculated gases and a distribution manifold which can move between a first position in which the recirculated gases can flow through the exchanger in one direction and a second position in which the recirculated gases can flow through the exchanger in the opposite direction.

Description

REFROIDISSEUR DE GAZ RECIRCULES RECIRCULATED GAS COOLER

La présente invention concerne les refroidisseurs de gaz recirculés, appelés gaz RGE, ou encore gaz EGR (pour exhaust gas recirculation). Pour améliorer la dépollution des gaz d'échappement d'un moteur à combustion interne, on a recours à la recirculation de gaz d'échappement dans l'admission, que l'on appelle d'une manière générale circuit EGR. De plus, l'emploi de refroidisseurs spécifiques pour ces gaz permet d'augmenter encore cette dépollution. Cependant, un problème majeur est que le recirculation des gaz d'échappement entraîne un encrassement important des composants qui se trouvent dans ce circuit EGR. C'est pourquoi on peut procéder à des séances de nettoyage / décrassage en ouvrant complètement la vanne EGR (la vanne EGR régule le débit de gaz EGR qui repart à l'admission) quand le moteur est sur une zone de fonctionnement déterminée. Ce procédé, décrit dans la demande FR2833653, permet d'éliminer thermiquement les dépôts s'accumulant dans le circuit EGR.The present invention relates to recirculated gas coolers, called EGR gas, or EGR gas (exhaust gas recirculation). To improve the decontamination of the exhaust gas of an internal combustion engine, recirculation of exhaust gas in the intake, which is generally called EGR circuit. Moreover, the use of specific coolers for these gases makes it possible to further increase this depollution. However, a major problem is that the recirculation of the exhaust gas leads to a significant fouling of the components that are in this EGR circuit. This is why we can proceed to cleaning / cleaning sessions by fully opening the EGR valve (the EGR valve regulates the flow of EGR gas that starts at the intake) when the engine is on a specific operating zone. This method, described in patent application FR2833653, makes it possible to thermally eliminate the deposits accumulating in the EGR circuit.

Ce problème d'encrassement n'est pourtant pas totalement résolu pour ce qui est du refroidisseur EGR. Le refroidisseur est constamment en fonctionnement, c'est-à-dire qu'il y a toujours un débit d'eau qui traverse l'échangeur. Ce qui se passe alors est que le refroidisseur est parfaitement décrassé à l'entrée lorsque l'on procède à une phase de décrassage, mais les gaz EGR qui sont constamment refroidis ne sont pas assez chaud pour décrasser complètement le refroidisseur EGR, surtout dans la deuxième moitié de l'échangeur eau/gaz EGR.This problem of fouling is not yet completely solved for the EGR cooler. The chiller is constantly in operation, that is to say that there is always a flow of water through the exchanger. What happens then is that the chiller is thoroughly unclogged at the inlet when performing a scrub phase, but the EGR gases that are constantly chilled are not hot enough to completely clean the EGR chiller, especially in the second half of the EGR water / gas heat exchanger.

Le document J P20043400099 concerne un système EGR de moteur à combustion interne comportant deux groupes de cylindres distincts. Ce système EGR présente la particularité de pouvoir inverser le flux de gaz d'échappement circulant dans le conduit, et par conséquent dans les refroidisseurs, en modifiant les pressions des gaz d'échappement entre le premier et le deuxième groupe de cylindres. Un inconvénient majeur est qu'il est nécessaire de disposer de deux groupes de cylindres distincts dans lesquels on peut modifier les pressions des gaz à l'échappement.Document J P20043400099 relates to an EGR system of an internal combustion engine comprising two groups of separate cylinders. This EGR system has the particularity of being able to reverse the flow of exhaust gas flowing in the duct, and consequently in the coolers, by modifying the pressures of the exhaust gases between the first and the second group of cylinders. A major disadvantage is that it is necessary to have two groups of separate cylinders in which the exhaust gas pressures can be modified.

L'invention vise à résoudre le problème d'encrassement des refroidisseurs EGR. L'invention propose dans ce but un refroidisseur de gaz recirculés définissant un conduit d'entrée et un conduit de sortie de gaz recirculés et comportant un échangeur thermique configuré en U avec un conduit d'entrée et un conduit de sortie. Selon l'invention , le refroidisseur comporte une paire de conduits croisés de dérivation des gaz recirculés et un distributeur mobile entre une première position permettant au flux de gaz recirculés de traverser l'échangeur dans un sens, et une deuxième position permettant au flux de gaz recirculés de traverser l'échangeur dans le sens inverse.The invention aims to solve the problem of fouling EGR coolers. The invention proposes for this purpose a recirculated gas cooler defining an inlet duct and a recirculated gas outlet duct and having a heat exchanger configured in U with an inlet duct and an outlet duct. According to the invention, the cooler comprises a pair of crossed ducts for bypassing the recirculated gases and a mobile distributor between a first position allowing the recirculated gas flow to pass through the exchanger in one direction, and a second position allowing the flow of gas recirculated to cross the exchanger in the opposite direction.

La présente invention et ses avantages seront mieux compris à la lecture de la description détaillée d'un mode de réalisation pris à titre d'exemple et nullement limitatif, et illustré par les dessins annexés sur lesquels : les figures 1 , 2, 3, 4, 5, 6 et 7 représentent un premier mode de réalisation. - Les figures 8, 9, 10 et 1 1 représentent un deuxième mode de réalisation.The present invention and its advantages will be better understood on reading the detailed description of an embodiment taken by way of example and in no way limiting, and illustrated by the appended drawings in which: FIGS. 1, 2, 3, 4 , 5, 6 and 7 show a first embodiment. - Figures 8, 9, 10 and 1 1 show a second embodiment.

Le refroidisseur 1 de gaz recirculés comporte un échangeur thermique 2 configuré en U , c'est-à-dire qu'il comporte des conduits d'entrée e2 et de sortie s2 qui débouchent sensiblement d'un même côté.The cooler 1 of recirculated gas comprises a heat exchanger 2 configured in a U, that is to say it comprises inlet ducts e2 and outlet s2 which open substantially on the same side.

Le refroidisseur 1 définit un conduit d'entrée e1 et un conduit de sortie si de gaz recirculés. Selon l'invention, le refroidisseur 1 comporte une paire supplémentaire de conduits croisés de dérivation des gaz recirculés et un distributeur. Le distributeur est en communication avec les conduits d'entrée e1 de sortie e2 du refroidisseur, les conduits croisés de dérivation, et les conduits d'entrée e2 et de sortie s2 de l'échangeur 2. Le distributeur est mobile entre deux positions : la première position permet au flux de gaz recirculés de traverser l'échangeur 2 dans un sens (dit sens normal), et la deuxième position permet au flux de gaz recirculés de traverser l'échangeur 2 dans le sens inverse. Selon un premier mode de réalisation représenté aux figures 1 à 7, le distributeur est un distributeur à tiroir 5 coulissant entre une première position permettant au flux de gaz recirculés de traverser l'échangeur 2 dans un sens (dit sens normal), et une deuxième position permettant au flux de gaz recirculés de traverser l'échangeur 2 dans le sens inverse. Le tiroir 5 peut être déplacé par tout actionneur connu de l'homme du métier.The cooler 1 defines an inlet duct e1 and an outlet duct if recirculated gas. According to the invention, the cooler 1 comprises an additional pair of crossed conduits for bypassing the recirculated gases and a distributor. The distributor is in communication with the inlet ducts E1 output e2 of the cooler, the crossed bypass ducts, and the inlet ducts e2 and outlet s2 of the exchanger 2. The distributor is movable between two positions: the first position allows the flow of recirculated gas through the exchanger 2 in one direction (said normal direction), and the second position allows the flow of recirculated gas through the exchanger 2 in the opposite direction. According to a first embodiment shown in FIGS. 1 to 7, the distributor is a slidable distributor 5 between a first position allowing the recirculated gas flow to pass through the exchanger 2 in one direction (in the normal sense), and a second position allowing the flow of recirculated gas to pass through the exchanger 2 in the opposite direction. The drawer 5 can be moved by any actuator known to those skilled in the art.

Le tiroir 5 coulisse dans une enceinte 4. Il comporte deux paires d'orifices (5a, 5d ; 5b, 5c) de communication (figure 5). Les orifices (5a, 5d ; 5b, 5c) de chaque paire sont chacun susceptibles d'être en communication avec un des deux conduits (e2,s2) de l'échangeur thermique (2). En référence à la figure 3, les orifices (e2,s2) de l'échangeur thermique 2 peuvent être de forme allongée pour permettre cette communication. Ainsi, les orifices 5a et 5d qui sont décalés en hauteur peuvent communiquer selon la position du tiroir 5 avec le conduit de sortie s2 de l'échangeur 2, et les orifices 5b et 5c qui sont également décalés en hauteur peuvent communiquer selon la position du tiroir 5 avec le conduit d'entrée e2 de l'échangeur 2. De l'autre côté du tiroir 5, les conduits d'entrée e1 et de sortie si du refroidisseur et les deux conduits croisés de dérivation (de1 ,ds1 ) sont agencés de manière à pouvoir communiquer avec un orifice (5a, 5d ; 5b, 5c) du tiroir 5.The slide 5 slides in an enclosure 4. It has two pairs of communication ports (5a, 5d, 5b, 5c) (FIG. The orifices (5a, 5d, 5b, 5c) of each pair are each capable of being in communication with one of the two ducts (e2, s2) of the heat exchanger (2). Referring to Figure 3, the orifices (e2, s2) of the heat exchanger 2 may be elongated to allow this communication. Thus, the orifices 5a and 5d which are offset in height can communicate according to the position of the drawer 5 with the outlet duct s2 of the exchanger 2, and the orifices 5b and 5c which are also offset in height can communicate according to the position of the drawer 5 with the inlet duct e2 of the exchanger 2. On the other side of the drawer 5, the inlet ducts e1 and outlet si of the cooler and the two crossed bypass ducts (de1, ds1) are arranged so as to be able to communicate with an orifice (5a, 5d, 5b, 5c) of the drawer 5.

Dans ce mode de réalisation, les conduits croisés de dérivations (de1 ,ds1 ) se trouvent en amont du tiroir 5. Cependant, on peut disposer de la même façon ces conduits croisés en aval du tiroir, sur les conduits d'entrée e2 et de sortie s2 de l'échangeur 2, et adapter les conduits d'entrée e1 et de sortie si du refroidisseur 1 pour leur donner une forme allongée du type de celle des conduits de l'échangeur 2.In this embodiment, the crossed ducts of branches (de1, ds1) are upstream of the drawer 5. However, one can dispose in the same way these crossed ducts downstream of the drawer, on the input ducts e2 and outlet s2 of the exchanger 2, and adapt the inlet ducts e1 and outlet if cooler 1 to give them an elongated shape of the type of the ducts of the exchanger 2.

Les conduits croisés de dérivation (de1 ,ds1 ) servent à guider le flux de gaz EGR dans le sens inverse, ils sont reliés aux conduits d'entrée e1 et de sortie si du refroidisseur 1 ; le conduit de dérivation de1 est relié au conduit d'entrée e1 et renvoi les gaz EGR du côté du conduit de sortie si ; le conduit de dérivation ds1 est relié au condu it de sortie si et renvoi les gaz EG R du côté du condu it d'entrée e1 .The crossed bypass ducts (de1, ds1) serve to guide the flow of EGR gas in the opposite direction, they are connected to the inlet ducts e1 and outlet if cooler 1; the bypass duct de1 is connected to the inlet duct e1 and returns the EGR gas side of the outlet duct if; the ds1 bypass duct is connected to the outlet duct if and sends the gases EG R on the side of the inlet duct e1.

Dans la première position du tiroir 5, représentée à la figure 7, les conduits croisés (de1 ,ds1 ) de dérivations sont désactivés. Seuls les conduits e1 et si sont activés : le condu it d'entrée e1 du refroidisseur 1 communique avec le l'orifice 5b du tiroir 5 et le flux de gaz part dans le conduit d'entré e2 de l'échangeur 2. Le conduit de sortie si du refroidisseur 1 commun ique avec l'orifice 5d du tiroir 5, et le flux de gaz EGR arrive du condu it de sortie s2 de l'échangeur 2 et part vers le conduit de sortie si du refroidisseu r 1 .In the first position of the drawer 5, shown in FIG. 7, the crossed ducts (de1, ds1) of branches are deactivated. Only the ducts e1 and si are activated: the inlet duct e1 of the cooler 1 communicates with the orifice 5b of the spool 5 and the flow of gas goes into the inlet duct e2 of the exchanger 2. The duct if the cooler 1 communicates with the orifice 5d of the spool 5, and the EGR gas flow arrives from the outlet pipe s2 of the exchanger 2 and goes to the outlet duct if cooler r 1.

Dans la deuxième position , représentée à la figure 6, seuls les condu its croisés (de1 ,ds1 ) de dérivations sont activés : le conduit de dérivation d'entrée de1 du refroidisseur 1 communique avec le l'orifice 5a du tiroir 5. Le conduit de dérivation de sortie ds1 du refroidisseur 1 communique avec l'orifice 5c du tiroir 5. Le flux de gaz EGR arrive par le conduit d'entrée e1 du refroidisseur 1 , passe par le conduit de dérivation d'entrée de1 , traverse l'orifice 5a, passe par le conduit d'entrée e2 de l'échangeur 2 puis par le condu it de sortie s2, traverse ensuite l'orifice 5c du tiroir 5, passe par le condu it de dérivation de sortie ds1 et ressort du refroidisseur 1 par le conduit de sortie si .In the second position, shown in FIG. 6, only the crossed conduction pipes (de1, ds1) are activated: the inlet bypass duct de1 of the cooler 1 communicates with the orifice 5a of the drawer 5. The duct output bypass ds1 of the cooler 1 communicates with the orifice 5c of the spool 5. The flow of EGR gas arrives via the inlet duct e1 of the cooler 1, passes through the inlet bypass duct de1, passes through the orifice 5a, passes through the inlet duct e2 of the exchanger 2 and then through the outlet duct s2, then passes through the orifice 5c of the spool 5, passes through the outlet bypass duct ds1 and leaves the cooler 1 by the outlet duct if.

Le refroidisseur 1 selon l'invention peut également comporter un by-pass 6 de l'échangeur 2. Ce by-pass 6 est disposé, dans ce premier mode de réalisation , en amont du distributeur à tiroir 5. I l permet de relier les conduits d'entrée e1 et de sortie si du refroidisseur 1 . Le by-pass 6 défin it à cet effet un conduit de liaison qui comporte u ne vanne ou un volet obturateur.The cooler 1 according to the invention may also comprise a bypass 6 of the exchanger 2. This bypass 6 is arranged, in this first embodiment, upstream of the spool valve 5. I l allows to connect the inlet ducts e1 and outlet if cooler 1. The bypass 6 defines for this purpose a connecting pipe which comprises a valve or a shutter.

Selon u n deuxième mode de réalisation représenté aux figures 8 à 1 1 , le distributeu r est un distributeur à boisseau 7 rotatif entre une première position permettant au flux de gaz recircu lés de traverser l'échangeur (2) dans un sens, et une deuxième position permettant au flux de gaz recirculés de traverser l'échangeur (2) dans le sens inverse.According to a second embodiment shown in FIGS. 8 to 11, the distributor is a rotary ball valve 7 between a first position allowing the stream of recirculated gases to pass through the exchanger (2) in one direction, and a second position allowing the flow of recirculated gas to cross the exchanger (2) in the opposite direction.

Le refroidisseur 1 comporte u n condu it d'entrée e1 et un condu it de sortie si qui débouchent sur le boisseau rotatif 7. Un condu it supplémentaire e' 1 relié au conduit e1 débouche sur le boisseau 7. De la même manière, un autre conduit supplémentaire s'1 relié au conduit si débouche sur le boisseau 7.The cooler 1 comprises an inlet duct e1 and an outlet duct 11 if which open on the rotary plug 7. An additional duct e '1 connected to the conduit e1 opens on the 7. In the same manner, another additional duct is connected to the duct if open on the plug 7.

L'échangeur 2 comporte un conduit d'entrée e2 et un conduit de sortie s2. L'échangeur 2 comporte également deux conduits croisés de dérivation de2 et ds2. Les conduits croisés de dérivation servent à guider le flux de gaz EGR dans le sens inverse ; le conduit de dérivation d'entrée de2 est relié au conduit d'entrée e2 et renvoi les gaz EGR du côté du conduit de sortie s2 ; le conduit de dérivation de sortie ds2 est relié au conduit de sortie s2 et renvoi les gaz EGR du côté du conduit d'entrée e2.The exchanger 2 comprises an inlet duct e2 and an outlet duct s2. The exchanger 2 also comprises two crossed bypass conduits de2 and ds2. The crossed bypass ducts serve to guide the flow of EGR gas in the opposite direction; the inlet bypass duct de2 is connected to the inlet duct e2 and returns the EGR gas side of the outlet duct s2; the outlet bypass duct ds2 is connected to the outlet duct s2 and returns the EGR gas from the side of the inlet duct e2.

Le boisseau 7 a la forme d'une pièce cylindrique qui définit deux perçages transversaux parallèles 8 et 9. Les axes des perçages 8 et 9 sont disposés sur un même plan longitudinal du boisseau 7. Les perçages transversaux (8,9) sont susceptibles de mettre en communication d'une part les conduits d'entrée (e1 ,e2) entre eux et les conduits de sortie (s1 ,s2) entre eux, et d'autres part les conduits supplémentaires (e'1 ,s'1 ) avec les conduits croisés de dérivation (dθ2, ds2 Les axes des conduits d'entrée e1 , e'1 débouchant sur le boisseau 7, les axes des conduits d'entrée e2, ds2 débouchant sur le boisseau 7, et l'axe du perçage 8 se trouvent sensiblement dans un même plan radial au boisseau 7. Les extrémités des conduits e1 , e'1 , e2, ds2 sont réparties de manière à ce que le perçage 8 mette en relation d'une part le conduit e1 et le conduit e2, et d'autre part le conduit e'1 et le conduit ds2.The plug 7 has the shape of a cylindrical piece which defines two parallel transverse bores 8 and 9. The axes of the bores 8 and 9 are arranged on the same longitudinal plane of the plug 7. The transverse bores (8, 9) are capable of communicating on the one hand the input ducts (e1, e2) between them and the output ducts (s1, s2) between them, and on the other hand the additional ducts (é1, s'1) with the crossed bypass ducts (dθ2, ds2) The axes of the inlet ducts e1, é1 opening on the plug 7, the axes of the inlet ducts e2, ds2 opening on the plug 7, and the axis of the bore 8 are located substantially in the same radial plane to the plug 7. The ends of the ducts e1, e'1, e2, ds2 are distributed so that the bore 8 connects on the one hand the duct e1 and the duct e2, and on the other hand the duct e1 and the duct ds2.

On peut appliquer par analogie la même description pour les conduits si , s2, s'1 , de2 et le perçage 9 du boisseau 5.The same description can be applied by analogy for the ducts si, s2, s'1, de2 and the bore 9 of the plug 5.

Lorsque le boisseau se trouve dans la première position, représenté à la figure 9, les conduits e'1 et ds2 sont désactivés. Il en est de même pour les conduits s'1 et de2. Le flux de gaz EGR rentre par le conduit e1 , traverse le perçage 8, passe dans le conduit e2. En sortant de l'échangeur 2, il passe par le conduit s2, traverse le perçage 9 et ressort par le conduit si . C'est le sens dit « normal » . Lorsque le boisseau 7 se trouve dans la deuxième position, inclinée de 90 degrés environ par rapport à la première position, représenté à la figure 10, les conduits e1 et e2 sont désactivés. Il en est de même pour les conduits si et s2. Le flux de gaz EGR rentre par le conduit e1 , bifurque vers le conduit e'1 , traverse le perçage 8, passe dans le conduit ds2, puis dans le conduit s2. En sortant de l'échangeur 2, il passe par le conduit e2, bifurque vers le conduit de2, traverse le perçage 9, passe par le conduit s'1 et ressort par le conduit si . C'est le sens dit « inversé » . Selon une variante, le distributeur peut comporter une troisième position permettant de by passer l'échangeur (2). Le boisseau 7 définit à cet effet une rainure 10 longitudinale d'une longueur permettant de mettre en relation les conduits e1 et si . Lorsque le boisseau 7 se trouve dans cette position, les perçages 8 et 9 ne communiquent avec aucun des conduits.When the plug is in the first position, shown in FIG. 9, the ducts et and ds2 are deactivated. It is the same for ducts s'1 and de2. The flow of EGR gas enters the duct e1, passes through the bore 8, passes through the conduit e2. Leaving the exchanger 2, it passes through the conduit s2, through the bore 9 and out through the conduit if. This is the meaning of "normal". When the plug 7 is in the second position, inclined at approximately 90 degrees with respect to the first position, shown in FIG. 10, the ducts e1 and e2 are deactivated. It is the same for the ducts si and s2. The flow of EGR gas enters the duct e1, forks to the duct e1, through the bore 8, passes in the duct ds2, then in the duct s2. On leaving the exchanger 2, it passes through the duct e2, forks to the duct de2, through the bore 9, through the duct S'1 and out through the duct if. This is the meaning of "inverted". According to one variant, the dispenser may comprise a third position making it possible to pass the exchanger (2). The plug 7 defines for this purpose a longitudinal groove 10 of a length for connecting the ducts e1 and si. When the plug 7 is in this position, the holes 8 and 9 do not communicate with any of the conduits.

Un avantage de la présente invention est que l'on peut, lors d'une phase de décrassage du refroidisseur, inverser le flux de gaz EGR afin de décrasser complètement l'échangeur. Un autre avantage est que l'on peut uniformiser l'encrassement naturel de l'échangeur, en alternant la circulation des gaz EGR dans l'échangeur. Un autre avantage est que l'on peut faire du refroidissement contrôlé des gaz EGR, en pilotant la position du boisseau 7 au voisinage des première et deuxième positions. Pour y parvenir, la rainure 10 réalisée dans le boisseau 7 est disposée à proximité des perçages 8 et 9. Une partie du débit peut alors traverser l'échangeur 2 dans le sens normal ou inversé, et l'autre passe directement par la rainure 10 pour ressortir, la somme des deux parties garantissant un débit de gaz indépendant de la position du boisseau 7. An advantage of the present invention is that it is possible, during a chilling phase of the cooler, to reverse the flow of EGR gas in order to completely clean the exchanger. Another advantage is that one can standardize the natural fouling of the exchanger, alternating the flow of EGR gas in the exchanger. Another advantage is that controlled cooling of the EGR gases can be done by controlling the position of the plug 7 in the vicinity of the first and second positions. To achieve this, the groove 10 made in the plug 7 is disposed near the bores 8 and 9. Part of the flow can then pass through the exchanger 2 in the normal or inverted direction, and the other passes directly through the groove 10 to stand out, the sum of the two parts guaranteeing a flow of gas independent of the position of the plug 7.

Claims

Revendications claims 1) Refroidisseur (1) de gaz recirculés définissant un conduit d'entrée (e1) et un conduit de sortie (si) de gaz recirculés et comportant un échangeur thermique (2) configuré en U avec un conduit d'entrée (e2) et un conduit de sortie (s2), caractérisé en ce qu'il comporte une paire de conduits croisés de dérivation des gaz recirculés et un distributeur mobile entre une première position permettant au flux de gaz recirculés de traverser l'échangeur (2) dans un sens, et une deuxième position permettant au flux de gaz recirculés de traverser l'échangeur (2) dans le sens inverse.1) Recirculated gas cooler (1) defining an inlet duct (e1) and an outlet duct (si) of recirculated gases and comprising a heat exchanger (2) configured in a U with an inlet duct (e2) and an outlet duct (s2), characterized in that it comprises a pair of crossed ducts for bypassing the recirculated gases and a distributor movable between a first position allowing the recirculated gas flow to pass through the exchanger (2) in a direction and a second position allowing the flow of recirculated gas to pass through the exchanger (2) in the opposite direction. 2) Refroidisseur (1) de gaz recirculés selon la revendication 1, caractérisé en ce que le distributeur est un distributeur à tiroir (5) coulissant entre une première position permettant au flux de gaz recirculés de traverser l'échangeur (2) dans un sens, et une deuxième position permettant au flux de gaz recirculés de traverser l'échangeur (2) dans le sens inverse.2) recirculated gas cooler (1) according to claim 1, characterized in that the distributor is a slide valve (5) sliding between a first position allowing the flow of recirculated gas to pass through the exchanger (2) in one direction and a second position allowing the flow of recirculated gas to pass through the exchanger (2) in the opposite direction. 3) Refroidisseur (1) selon la revendication 2, caractérisé en ce que le tiroir (5) coulissant du distributeur comporte deux paires d'orifices (5a, 5d ;5b,5c) de communication, les orifices de chaque paire étant chacun susceptible d'être en communication avec un des deux orifices (e2,s2) de l'échangeur thermique (2).3) Cooler (1) according to claim 2, characterized in that the slide (5) sliding of the distributor comprises two pairs of ports (5a, 5d, 5b, 5c) of communication, the orifices of each pair being each capable of be in communication with one of the two orifices (e2, s2) of the heat exchanger (2). 4) Refroidisseur (1) selon la revendication 3, caractérisé en ce que les conduits d'entrée (e1) et de sortie (si) des gaz recirculés et les deux conduits croisés de dérivation (de1, ds1) sont agencés de manière à pouvoir communiquer chacun avec un orifice (5a, 5d ;5b,5c) du tiroir (5).4) Cooler (1) according to claim 3, characterized in that the inlet ducts (e1) and outlet (if) of the recirculated gases and the two crossed bypass ducts (de1, ds1) are arranged so as to be able to each communicate with an orifice (5a, 5d, 5b, 5c) of the slide (5). 5) Refroidisseur (1) selon l'une des revendications précédentes, caractérisé en ce que les conduits croisés de dérivation (de1, ds1) sont reliés aux conduits d'entrée (e1) et de sortie (si) du refroidisseur (1). 6) Refroidisseur (1 ) selon l'une des revendications précédentes, caractérisé en ce qu'il comporte un by-pass (6) de l'échangeur (2) disposé en amont du distributeur.5) Cooler (1) according to one of the preceding claims, characterized in that the crossed bypass ducts (de1, ds1) are connected to the inlet ducts (e1) and outlet (si) of the cooler (1). 6) Cooler (1) according to one of the preceding claims, characterized in that it comprises a bypass (6) of the exchanger (2) disposed upstream of the distributor. 7) Refroidisseur (1 ) de gaz recirculés selon la revendication 1 , caractérisé en ce que le distributeur est un distributeur à boisseau (7) rotatif entre une première position permettant au flux de gaz recirculés de traverser l'échangeur (2) dans un sens, et une deuxième position permettant au flux de gaz recirculés de traverser l'échangeur (2) dans le sens inverse.7) Cooler (1) recirculated gas according to claim 1, characterized in that the distributor is a rotary valve (7) rotatable between a first position allowing the flow of recirculated gas to pass through the exchanger (2) in one direction and a second position allowing the flow of recirculated gas to pass through the exchanger (2) in the opposite direction. 8) Refroidisseur (1 ) selon la revendication 7, caractérisé en ce que le boisseau (7) définit deux perçages transversaux (8,9) parallèles et dont les axes se trouve dans un même plan longitudinal du boisseau (7).8) Cooler (1) according to claim 7, characterized in that the plug (7) defines two transverse bores (8,9) parallel and whose axes is in the same longitudinal plane of the plug (7). 9) Refroidisseur (1 ) selon la revendication 7 ou 8, caractérisé en ce que les conduits croisés de dérivation (de1 , ds1 ) sont reliés aux conduits d'entrée (e2) et de sortie (s2) de l'échangeur (2).9) Cooler (1) according to claim 7 or 8, characterized in that the crossed bypass ducts (de1, ds1) are connected to the inlet ducts (e2) and outlet (s2) of the exchanger (2) . 10) Refroidisseur (1 ) selon la revendication 8, caractérisé en ce qu'il comporte des conduits supplémentaires (e'1 ,s'1 ) reliés aux conduits d'entrée (e1 ) et de sortie (si ) du refroidisseur (1 ), et en ce que les perçages transversaux (8,9) sont susceptibles de mettre en communication d'une part les conduits d'entrée (e1 ,e2) entre eux et les conduits de sortie (s1 ,s2) entre eux, et d'autres part les conduits supplémentaires (e'1 ,s'1 ) avec les conduits croisés de dérivation (de2, ds2).10) Cooler (1) according to claim 8, characterized in that it comprises additional ducts (é1, s'1) connected to the inlet ducts (e1) and outlet (si) of the cooler (1) , and in that the transverse bores (8, 9) are capable of communicating on the one hand the inlet ducts (e1, e2) between them and the outlet ducts (s1, s2) between them, and on the other hand, the additional ducts (é1, s'1) with the crossed bypass ducts (de2, ds2). 1 1 ) Refroidisseur (1 ) selon l'une quelconque des revendications 7 à 10, caractérisé en ce que le distributeur à boisseau (7) rotatif comporte une troisième position permettant de by passer l'échangeur (2) disposé en aval du distributeur.1 1) Cooler (1) according to any one of claims 7 to 10, characterized in that the rotary valve (7) has a third position for passing the exchanger (2) disposed downstream of the distributor. 12) Refroidisseur (1 ) selon la revendication 1 1 , caractérisé en ce que le by-pass est constitué d'une rainure (10) longitudinale réalisée sur le boisseau (7) et d'une longueur permettant de mettre en relation les conduits d'entrée (e1) et de sortie (si) du refroidisseur (1). 12) Cooler (1) according to claim 1 1, characterized in that the bypass consists of a groove (10) formed on the longitudinal bushel (7) and a length to put in relationship the inlet ducts (e1) and outlet (if) of the cooler (1).
PCT/FR2006/050973 2005-09-30 2006-10-02 Device for cooling recirculated gases Ceased WO2007039700A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT06831259T ATE535701T1 (en) 2005-09-30 2006-10-02 DEVICE FOR COOLING RECYCLED GASES
EP06831259A EP1934458B1 (en) 2005-09-30 2006-10-02 Device for cooling recirculated gases

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0552968A FR2891589A1 (en) 2005-09-30 2005-09-30 Recirculated exhaust gas cooler for increasing depollution of exhaust gas, has derivation ducts, and distributor movable between two positions permitting gas to traverse heat exchanger in normal and reverse direction, respectively
FR0552968 2005-09-30

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ATE535701T1 (en) 2011-12-15
EP1934458A1 (en) 2008-06-25
FR2891589A1 (en) 2007-04-06

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