EP2044319A1 - Dispositif de refroidissement d'un flux de gaz d'un moteur à combustion interne - Google Patents

Dispositif de refroidissement d'un flux de gaz d'un moteur à combustion interne

Info

Publication number
EP2044319A1
EP2044319A1 EP07786061A EP07786061A EP2044319A1 EP 2044319 A1 EP2044319 A1 EP 2044319A1 EP 07786061 A EP07786061 A EP 07786061A EP 07786061 A EP07786061 A EP 07786061A EP 2044319 A1 EP2044319 A1 EP 2044319A1
Authority
EP
European Patent Office
Prior art keywords
housing
wall portion
gas
coolant
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Withdrawn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
EP07786061A
Other languages
German (de)
English (en)
Inventor
Peter Geskes
Bernd GRÜNENWALD
Wolfgang KNÖDLER
Jens Ruckwied
Jürgen BARWIG
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.)
Mahle Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
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 Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Publication of EP2044319A1 publication Critical patent/EP2044319A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F28D7/10—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 being arranged one within the other, e.g. concentrically
    • F28D7/106—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 being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0418—Layout of the intake air cooling or coolant circuit the intake air cooler having a bypass or multiple flow paths within the heat exchanger to vary the effective heat transfer surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/045—Constructional details of the heat exchangers, e.g. pipes, plates, ribs, insulation, materials, or manufacturing and assembly
    • F02B29/0462—Liquid cooled heat exchangers
    • 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
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F02M26/26—Layout, e.g. schematics with coolers having bypasses characterised by details of the bypass valve
    • 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
    • F02M26/32—Liquid-cooled heat exchangers
    • 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
    • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded
    • 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 relates to a device for cooling a gas flow of an internal combustion engine according to the preamble of claim 1.
  • heat exchangers are known, which include exchanger tubes made of stainless steel due to the high temperatures and high corrosivity of the exhaust gas. Such exchanger tubes are connected via holding means such as bottom pieces with a coolant-carrying housing, wherein the production of such heat exchangers is generally expensive.
  • exhaust gas can under a gas flow in the context of the invention charge air z. B. from a turbocharger or an exhaust-air mixture are understood. These gas streams also often require cooling before being fed to the internal combustion engine in order to ensure the function and efficiency of the internal combustion engine.
  • This object is achieved by the invention with an aforementioned device in which the characterizing features of claim 1 are provided according to the invention. Due to the integral formation of material of the two wall sections a separation of the environment and coolant and a separation of coolant and gas flow is at least partially ensured by the same one-piece component. This allows a particularly favorable production of the housing, since this does not have to be composed of several components, at least in the areas of the wall sections, either by mechanical fastening using sealants or be it by soldering or welding.
  • the unitary material formation in the sense of the invention comprises a uniform, seamless production of the two wall sections comprehensive housing part.
  • the first and the second wall portion of the housing made of a light metal, in particular based on aluminum.
  • Aluminum is both easy to build and inexpensive moldable.
  • the molding of a housing part comprising the first and the second wall section takes place as a cast part, in particular a diecast part.
  • This cost-effective production of a lightweight housing is especially in the case of cooling a hot exhaust stream at least in the region of the exhaust gas inlet into the housing, especially made possible by the fact that the aluminum is cooled directly by the particular liquid coolant.
  • the coolant may be, for. B. to act the main coolant of the engine and / or an additional, in particular cooled to ambient temperature cooling circuit.
  • the cast housing part has a first demoulding side and a second demolding side, wherein the first demolding side for guiding the coolant and the second demoulding side mung side is designed to guide the gas.
  • a housing part comprising the first and the second wall section is designed as an extruded profile.
  • Extruded profiles are particularly inexpensive to produce and can have very complex cross-sectional shapes.
  • a crystalline structure of the aluminum is achieved, which has a particularly good corrosion resistance.
  • the cooling of hot, corrosive exhaust gas is well possible.
  • Important in the use of extruded profiles in particular for the cooling of exhaust gas is the avoidance of a subsequent strong heating of the pressed profiles, such as in a brazing furnace, since in this case the good corrosive properties can be lost again.
  • the first and the second wall portion of the housing may be formed of a one-piece sheet metal part, which consists in particular of a stainless steel.
  • sheet metal forming can take place by means of simple deep-drawing, which results in cost-effective production with little scrap.
  • the housing comprises at least one cover part which is not formed in one piece with the wall sections.
  • sealing means for sealing the coolant and / or the gas are provided on the cover part.
  • the cover part z. B. are bolted to the other housing.
  • the Cover part also be sealingly soldered to the other housing. If both the cover part and the housing are made of a light metal alloy based on aluminum, such a soldering of a mechanically preassembled heat exchanger can take place, for example, in a brazing furnace. Depending on the design, it can also be a local soldering or welding process.
  • At least one of the two, the supply or the discharge of the coolant, is arranged on the cover part.
  • the cover part has a channel for guiding the coolant, so that the cover part itself can be cooled.
  • the cover part come into contact with the hot gas stream even when produced from light metal.
  • the cover part has at least two, in particular three, plate-like elements arranged on top of each other, wherein the channel is formed by a recess in at least one of the plate-like elements.
  • the cover part preferably has an overflow opening for connecting the channel to the further housing. As a result, both the cover part and the further housing can be flowed through and cooled by means of a single supply of the coolant.
  • the exchange means is formed in an advantageous embodiment as in particular connected to the cover part module. In this way, a supply or discharge of the coolant can be provided on the cover part, wherein in addition a preliminary test for reducing the rejects in the production is made possible in a simple manner.
  • the exchange means is designed as a stack of disks, wherein in particular the stack can be flowed through by the coolant and can be flowed around by the gas. In this way, a simple to manufacture embodiment of the exchange means is given, which also has a high exchange performance with a small size and can be integrated inexpensively and easily into the housing of the device according to the invention.
  • the exchange means may also be formed as a casting, in particular die casting with a plurality of cooling fins. As a result, the exchange means can be produced particularly inexpensively.
  • the exchange means may also comprise a tube bundle.
  • the exchange means is formed as arranged in the housing module.
  • the exchanger means may also be formed integrally with the first and second wall sections in the same material. This leads to a particularly cost-effective production with a particularly small number of individual parts and thus a high level of operational safety.
  • the exchanger means preferably has a plurality of ribs which can be flowed around by the gas and formed in one piece with the first wall section, thereby increasing the contact surface between the first wall and gas in order to optimize the cooling performance.
  • the device is designed as a U-flow cooler.
  • it may alternatively be an I-flow cooler.
  • the device preferably comprises a bypass channel, which in the case of I-flow coolers geometric reasons usually separate is provided in addition to the exchange means, whereas in U-flow cooling mostly the possibility of a bypass deflection of the gas flow from the supply to the discharge in the inlet region of the U-flow heat exchanger is possible.
  • a valve member for adjustable deflection of the gas stream is arranged in the housing.
  • the means for deflection for example for bypass deflection, are integrated into the housing in a modular manner, which results in a compact design.
  • a valve member for adjustable regulation of a total size of the gas flow is arranged in the housing.
  • a deflection of the gas flow through the exchange means or a bypass path can also be adjusted via the valve member.
  • the first and / or the second wall section is a cooled wall section. This can be achieved in particular in that both the first wall section and the second wall section are arranged directly adjacent to the coolant, so that advantageously results in both a cooling of the first wall section and the second wall section.
  • the first wall section preferably practically completely, can be arranged inside the housing.
  • the second wall portion practically completely forms a housing outer wall of a housing part and / or a housing.
  • the second wall section completely up to areas of the supply and discharge of the gas to be cooled, a housing outer wall of a housing part and / or a housing forms.
  • the housing can be designed and manufactured in a particularly simple manner, the advantages of the concept of the invention being realized.
  • the second wall section may form a housing outer wall of a housing part and / or of a housing only in a first partial area.
  • this relates only to a first sub-area except for areas of supply and discharge of the gas to be cooled.
  • the first subregion is essentially limited to those regions of a housing part and / or of the housing which are in contact with comparatively hot, in particular uncooled, gas. This preferably relates to input and / or bypass areas of a housing part and / or a housing.
  • the second wall section has to be designed practically only in the first partial area provided in this development as a wall section adjoining the coolant.
  • measures for the design of the second wall section beyond the first partial area are omitted in order to form the second wall section as a coolant-adjacent wall section.
  • a section of the second wall section housing can also be arranged on the inside.
  • the housing has a further third wall section.
  • the first wall portion and the second wall portion and the third wall portion may be formed integrally materially in one piece according to the concept of the invention. This results in the comparison with the first variant of the invention given where appropriate, to be preferred advantage that the third wall section is interpreted uncooled.
  • the third wall portion can thus be particularly easy to interpret in an advantageous manner.
  • the third wall section in a further, second subregion form a housing outer wall of a housing part and / or a housing. It has proved to be expedient that the second subregion is essentially limited to those regions of a housing part and / or of the housing which are in contact with comparatively cooler gas, in particular cooled and / or partially cooled gas. This applies in particular to regions which are arranged adjacent to the exchange means and / or deflection regions of a housing part and / or a housing.
  • the second wall portion and the third wall portion may together form virtually completely a housing outer wall of a housing part and / or a housing.
  • the second wall section and the third wall section can form a housing outer wall of a housing part and / or a housing completely, except for regions of the feed and discharge of the gas to be cooled.
  • a section of the third wall section may also be arranged inside the housing.
  • the third wall section can be made with a thinner wall than the second wall section.
  • the second wall section can be provided with a wall thickness which in approximately corresponds to the wall thickness of the first wall portion.
  • the third wall section can advantageously be designed to be simpler than the second wall section. According to the aforementioned development, it has proven to be particularly expedient to achieve a Materia spam by a thinner-walled design, which also leads to a weight advantage and a space savings in the device of the aforementioned type.
  • the housing may be designed as part of an intake module of the internal combustion engine.
  • the housing or even a cover part may be formed integrally with the intake module.
  • Intake modules of modern internal combustion engines are usually aluminum castings, so that the optimization of space and cost integration of the cooling elements with the intake ports of the internal combustion engine is desirable to a common module.
  • the concept presented could also be used for be used in which compared to the applications described flow paths of coolant and gas / exhaust gas / charge air are reversed, ie the flow paths described below for a gas / exhaust gas / charge air are provided and vice versa for gas / exhaust / Charge air described flow paths are provided to a coolant.
  • this relates to the exemplary embodiments of FIGS. 12, 13 and 14 which are described below and which are versatile.
  • the exemplary embodiments described below, in particular the exemplary embodiments according to FIGS. 12, 13 and 14, are also suitable for providing a vaporizable medium in the flow paths of the coolant as coolant.
  • the heat exchanger is formed in the form of an evaporator. This can be particularly useful if the hot medium used in the flow paths for gas / exhaust gas / charge air gives off its heat for evaporation of the vaporizable medium, for example a water, a refrigerant or other vaporizable fluids.
  • Such a heat exchanger in the form of a cooler can be particularly preferably arranged behind an exhaust gas turbine, expediently on a low-pressure side of an internal combustion engine, in order to use the exchanged heat, for example in a Rankine cycle.
  • a heat exchanger can be designed according to the principle of a cooler as a capacitor.
  • a condensable medium is guided and in the following for exhaust / gas / charge air provided flow paths, i.
  • a cooling medium is provided for the flow.
  • Fig. 1 shows a schematic representation of a first embodiment according to a first variant of the invention with a separately shown cover part. 007/006237
  • Fig. 2 shows a schematic plan view of the embodiment of Fig. 1 from the side.
  • FIG. 3 shows a coolant side plan view of a second embodiment according to a first variant of the invention.
  • FIG. 4 shows a gas side view of the embodiment from FIG.
  • FIG. 5 shows a spatial schematic view of a third embodiment according to a first variant of the invention.
  • FIG. 6 shows the exemplary embodiment from FIG. 5, omitting an uppermost plate element of a lid.
  • Fig. 7 shows the embodiment of Fig. 6 omitting a central plate member of the lid.
  • FIG. 8 shows a spatially open view of the exemplary embodiment from FIGS. 5 to 7 from a gas side.
  • FIG. 9 shows the exemplary embodiment from FIGS. 5 to 8 in an opened position
  • Fig. 10 shows a sectional view of the device of Fig. 8 along the line A-A.
  • FIG. 11 shows a schematic top view of an exchange means arranged on a cover from the side.
  • Fig. 12 shows a schematic sectional view through a further embodiment.
  • Fig. 13 is a perspective view of a housing of the embodiment of Fig. 12.
  • Fig. 14 is a sectional view of a housing of another embodiment.
  • FIG. 15 shows a gas-side plan view - similar to that in FIGS. 1, 4 or 8 for a further embodiment according to the second variant of the invention, in which the cooler is operated in the U-flow.
  • Fig. 16 shows a gas-side plan view as in Fig. 15 for a further embodiment according to the second variant of the invention in which the cooler is operated in I-flow.
  • Fig. 17 shows schematically a complete intake module, the right part of an exhaust gas cooler and in the lower part of a coolant-cooled intercooler is installed and are shown in dashed lines in the cooled wall areas.
  • the first embodiment according to FIG. 1 comprises a housing 1 which is produced by die casting from an aluminum alloy.
  • the housing 1 is shown in an open form next to a cover part 2, wherein the cover part 2 is shown in a schematic sectional view for the representation of arranged in the cover part 2 coolant channels.
  • the housing 1 comprises a feed 3 and a discharge 4 for a gas flow of an internal combustion engine.
  • the device or the heat exchanger according to FIG. 1 serves to cool a recirculated exhaust gas stream 60 exemplified in FIG. 17 for the purpose of reducing pollutants of an internal combustion engine 50 of a motor vehicle.
  • the housing 1 has a first, inner wall section 1a and an outer, the first wall section 1a spaced circumferential wall portion 1b.
  • the inlets and outlets 3, 4 formed as connecting pieces are arranged at openings of the outer wall 1b and open into a space 1a enclosed by the first, inner wall on three sides.
  • a exchange means 5 which is provided as a separate module within the inner wall 1a.
  • the exchange means 5 is a heat sink, which can be traversed by a liquid coolant by means of connections 5a, 5b.
  • an inlet region 6 is provided for the gas flow within the first wall 1a.
  • a deflection region 7 is provided between the inner wall 1a and the heat sink 5.
  • a movable actuator 9 in the form of an adjusting flap is provided on suitably designed guide structures 8.
  • the housing 1 is formed at least with the inner wall portion 1 a and the outer wall portion 1 b as integrally molded die-cast part.
  • a lower bottom 10 of the housing 1 may also be ein Anlagenig with the
  • Wall sections 1a, 1b may be formed in the die-casting process.
  • a one-sided demolding of the casting Given that both the gas-conducting region and the coolant-carrying region would be formed by the same mold side.
  • the housing 1 with the wall sections 1a and 1b can also be a section of an extruded profile.
  • the coolant-side bottom part 10 would be placed separately, and it could expedient similar to the cover part described below 2 channels for the passage of coolant and thus for cooling the bottom part 10 in the region of contact with the gas stream.
  • the wall portion 1 a which separates the gas flow from the coolant flow
  • the wall portion 1 b which separates the coolant flow from the environment material integrally formed.
  • the cover part 2 which forms an upper cover of the housing 1, is composed of a total of three plate elements 2 a, 2 b, 2 c (see FIG. 2), which are made of aluminum and are soldered to one another flatly.
  • Plate elements 2a, 2b, 2c has suitable openings, the one
  • the upper plate member 2a has an opening for connecting a supply 11 for the coolant.
  • the middle plate member 2b shown in the plan view in FIG. 1 has
  • the lower plate member 2c has openings 15, by means of which a connection of the channels 12, 13, 14 on the one hand to the exchanger means 5 and on the other hand with the coolant leading rooms 1c of the housing 1 between the walls 1 a, 1 b are prepared.
  • the entire coolant flows through the feed 11 and the opening in the upper plate member 2a in the channel 12 of the central plate member 2b and by a congruent opening of the lower plate member 2c in the exchange means 5.
  • the coolant enters through a further opening of the lower plate member 2c in the channel 13 of the central plate member 2b, from which it is passed via the channels 14 in a coolant-carrying shaft 1d of the housing 1.
  • This shaft 1 d is connected to a nozzle 16 for the discharge of the coolant from the housing 1.
  • the shaft 1d is located in the inlet region 6 of the gas flow and is closed off on one side by the outer wall 1b in the immediate vicinity of the feed 3 and outlet 4 of the gas flow. In this way, this temperature-critical region of the wall 1 b is cooled.
  • the partial flow of the channel 12 of the central plate element 2 b is passed through an opening 15 of the lower plate member 2 c in a gap 1 c circulating the greater part of the housing 1, so that the largest possible part of the contacting with the gas flow Wandab- section 1 a by the coolant is cooled.
  • this partial flow is also supplied to the part 1 d, so that the entire coolant leaves the housing 1 via the discharge connection 16.
  • the exchange means 5 represents a module which is connected to the cover part 2 and is separate from the housing 1.
  • An exemplary embodiment of the exchange means 5 is shown in FIG. 11.
  • the exchange means 5 is constructed as a stack of discs 5c, as in a similar manner z. B. from stacked disc oil coolers are known.
  • the stack of discs 5c forms a total of a cavity 5d to flow through the coolant, wherein plate-like formations of the discs 5c form spaces 5e, which are traversed by the gas flow with contact over the largest possible area.
  • Such a stacked disk design may conveniently consist of molded sheet metal parts made of corrosion-resistant steel.
  • the exchange means 5 can also be produced from aluminum. Basically the exchanger means 5 may also be integrally formed with the housing 1 in the same material.
  • the exchange means can have ribs, turbulence inserts, embossed structures, such as fins, which are arranged on the coolant side and / or on the gas side, as required, in order to improve the exchange performance.
  • the housing according to FIG. 3 and FIG. 4 is produced by a die-casting method with at least two-part mold, in which a first demoulding side of the housing 1 is assigned to the guide of the coolant and a second demolding side of the guide of the gas flow assigned.
  • the Entungsungsseite of the coolant is shown in Fig. 3 and the Entformungsseite of the gas stream is shown in Fig. 4.
  • Both on the coolant side and on the gas side is on the housing 1 each have a cover part (not shown).
  • the cover parts can by means of seals and z. B. screwed or sealed by means of surface soldering.
  • the housing 1 of the second embodiment comprises a material integral integral intermediate bottom which extends parallel to the flow direction of the gas flow over the largest part of the housing 1 and the wall portion 1 a, since he on the one hand to the coolant and on the other hand, adjacent to the gas flow.
  • This intermediate bottom 1a has an opening 17, by means of which coolant is guided from the coolant-carrying housing side (FIG. 3) to the modular exchange means 5.
  • To the- This opening 17 is provided with a seal for sealing the gas flow against the coolant.
  • the supply of the coolant takes place via a feed pipe 18, which passes through the gas-side cover, that is, the lid placed on the view according to FIG. 4, and opens into the exchanger means 5.
  • the coolant enters through the opening 17 in the coolant-side space of the housing 1 a.
  • the cover part assigned to the side according to FIG. 3 has a sufficient distance from the intermediate bottom 1a, so that the coolant can flow over the entire intermediate bottom in a planar manner.
  • a shaft-like cavity 1d is provided, which is arranged in the vicinity of the feed and discharge 3, 4 of the gas flow on the outer wall 1b.
  • the coolant is led away from this shaft 1d by a discharge nozzle.
  • the housing 1 of the second embodiment may also consist of a sheet metal part, in particular of stainless steel in a modification.
  • the sheet can be deformed for example by simple deep drawing.
  • the ratios of the depths of the structures to the height and width of the housing can be adjusted accordingly to enable deep drawing.
  • FIGS. 5 to 10 A further exemplary embodiment is shown in FIGS. 5 to 10. This has in common with the exemplary embodiment according to FIGS. 3 and 4 that the housing 1 is produced in a casting process with a gas-side demoulding side (see FIG. 8) and a Coolant side demolding page (see view of FIG. 9) is produced. Both gas side and coolant side a lid is arranged on the housing 1.
  • the gas-side cover 2 consists, as in the first embodiment, of three plate elements 2a, 2b, 2c.
  • the upper plate member 2a has a supply port 18 for the coolant.
  • the feed pipe 18 leads into the modularly formed Tau- shear means 5, which is fixed to the cover part 2.
  • An outlet of the coolant from the exchanger means 5 leads through openings 20 of the bottom plate member 2 c of the lid 2 in channel-like openings 19 of the central plate member 2 b. Due to the flow through the channels 19 (only a short channel is shown by way of example in FIG. 6), the cover part 2 is cooled. About openings 20 in the lower plate member 2 c, the cooling center Istrom is then continued into the housing 1, where it flows through to cool the wall sections 1 a, 1 b between these cavities 1 c.
  • a valve member 21 for controlling the gas flow is arranged in the housing 1 of the embodiment of FIG. 5 to FIG. 10 by means of suitable openings.
  • the valve member 21 comprises a valve spool 22 and a slide rod 23 which is guided in a gastight manner through the wall 1b and which is connected to a drive M exemplified in FIG.
  • the valve member 21 may be received by means of steel, ceramic or other inserts in the aluminum housing.
  • the valve spool is in the schematic representation of an elongated cylinder, which passes through in a middle position two openings of two wall sections 24, 25. In this middle position (see Fig. 8), the passage for the gas flow is completely blocked, which can either take a path through the wall 24 and subsequently through the exchanger means 5 or through the wall 25 and directly to the gas outlet 4. Depending on the movement of the Slider 22 from its central position in one direction or the other, both size and course of the gas flow can be adjusted.
  • the direct route from the inlet 3 to the outlet 4 through the wall 25 is a bypass operation in which the gas flow does not undergo any appreciable cooling.
  • a further advantageous detail of the embodiment according to FIGS. 5 to 10 results from the sectional view according to FIG. 10.
  • a separating web 26 between the incoming and returning gas flow has a cavity on the coolant side corresponding to the construction of the housing 1.
  • deflection webs 27a are formed, which protrude into this cavity.
  • the coolant according to FIG. 10 experiences a multiple deflection in the cavity 26, so that the gas-side separating web 26 is cooled particularly well.
  • the coolant-side cover member 27 Since the coolant-side cover member 27 has no direct contact with the gas to be cooled, it may in principle be made of plastic even in the case of hot gases. However, it may also be an aluminum cover part, which is mechanically fixed or glued over seals in the previously described manner or surface-soldered.
  • the flow paths of the coolant may be different in the embodiments according to FIGS. 1 to 10, depending on the arrangement of the feeding, discharging and distributing channels. It can first flow through the exchanger means and subsequently the housing or vice versa. Alternatively or additionally, a flow branch can be provided, by means of which a partial flow flows through the exchanger means and another partial flow through the channels for housing and lid cooling.
  • FIG. In contrast to the exemplary embodiments according to FIGS. 1 to 10, it is This is not a U-flow heat exchanger, but an I-flow heat exchanger in which the gas flow through the heat exchanger in the longitudinal direction and the feed pipe 3 is arranged with respect to the housing 1 on the opposite side of the discharge nozzle 4.
  • the housing 1 of the heat exchanger according to FIG. 12 and FIG. 13 is designed as an extruded profile of an aluminum alloy which is of integral material.
  • the extruded profile 1 comprises a central continuous chamber 28 for guiding the gas flow, which is enclosed by a wall portion 1 a substantially circular. From the first wall portion 1a, rib members 29 extend into the chamber 28 to enlarge the wall surface to improve heat exchange.
  • the first wall section 1 a is surrounded concentrically by a second wall section 1 b, which forms an outer wall of the housing 1.
  • a number of connecting webs 30 connect the first wall section 1a to the second wall section 1b.
  • a plurality of passage channels 31 are arranged for the passage of the coolant.
  • the wall portion 1 b thus separates the coolant from the environment and the wall portion 1 a, which is formed integrally with the wall portion 1 b of the same material, separates the gas flow from the coolant.
  • an inlet-side connection region 32 and an outlet-side connection region 33 are arranged at each end of the housing 1.
  • the terminal areas 32, 33 are glued to the housing 1 or soldered under exclusive local heating. A screw connection in conjunction with sealants is possible. It is important that the extruded profile 1 is no longer completely heated during assembly, since investigations have shown that extruded aluminum has a particularly good corrosion resistance to hot exhaust gases. This surprising effect could by the temperature and pressure conditions of the EP2007 / 006237
  • a further advantage of the embodiment according to FIGS. 12 and 13 results from the fact that the tubular elongate housing 1 can be bent to adapt to the available installation space.
  • FIG. 14 Shown is a cross section through a modified housing 1.
  • the modified housing is not round in cross-sectional shape, but substantially rectangular.
  • a coolant channels 31 are formed between an outer wall portion 1 b and an inner wall portion 1 .
  • the first wall section 1a surrounds a gas channel 28, which is provided with fin elements 29 projecting from the wall 1a for the purpose of better cooling.
  • Adjacent to the gas channel 28, a gas channel formed by the bypass channel 34 in the extrusion pressprofi I is provided.
  • the bypass channel 34 has a réelleverklei- PHg of a stainless steel sheet 35 for better thermal insulation, since the flow of the bypass channel as low as possible cooling of the exhaust gas is desired.
  • FIG. 15 shows a further embodiment of a device for cooling a gas stream 60 of an internal combustion engine 50 according to a second variant of the invention in a schematic form, as for example - in adapted version - similar to that shown in Fig. 17, in the context of a suction module 40th for an internal combustion engine 50 can be realized.
  • the operation of the module shown in FIG. 15 corresponds to that of a module as shown in FIG. 1, FIG. 4 or FIG. Especially 4, similar to the module shown in FIG. 4, also in the module shown in FIG. 15, the exchanger means 5 designed as a cooler is operated in a U-flow arrangement.
  • FIG. 15 and FIG. 16 show only a gas-side demolding side of the housing 1, in a similar manner as is the case in FIGS. 1, 4 and 8.
  • FIG. 16 shows, with otherwise identical mode of operation, the arrangement of an exchanger means 5 embodied as a cooler in the module in an I-flow arrangement.
  • a bypass 34 is realized, which can be shielded by the exchange means 5 by a partition wall 1e 'optionally provided in FIG. 16.
  • parts with the same function are provided with the same reference numerals in FIGS. 15 to 17 and symbolizes coolant flows with dotted arrows and gas flows with solid arrows, as already explained in the embodiments explained above.
  • the coolant is transferred to the housing via the cover between the opening 17 and the channel 1d.
  • the coolant transfer for the inner region 1b 'from the inside to the outside takes place on the coolant side, which is arranged on the underside of the housing in the embodiment shown in FIGS. 15 and 16.
  • first wall section 1a and in particular also the second wall section 1b of the housing 1 or of a housing part is designed as a cooled wall section.
  • the exemplary embodiments explained in connection with FIGS. 15 and 16 according to the second variant of the invention provide that only a part of the outer housing wall is cooled by coolant and practically only those wall areas which also come into contact with comparatively hot exhaust gas kick, be cooled. Accordingly, in the exemplary embodiments shown in FIGS. 15 and 16, the second wall section 1 b forms only in one embodiment.
  • a housing outer wall of a housing part and / or a housing 1 In the first sub-area, namely in the partial area shown in dashed lines, except for areas of the feed 3 and 4 discharge of the gas to be cooled 60, a housing outer wall of a housing part and / or a housing 1.
  • the portion shown in dashed lines in FIG. 15 and FIG is substantially limited to those areas of the housing part and / or the housing 1, which are in contact with the comparatively hot and uncooled gas. In the present case, this is the case in the entry area on the right-hand side shown in FIGS. 15 and 16 and / or in the bypass area on the left-hand side of the housing part 1 and / or the housing 1 shown in FIGS. 15 and 16.
  • a section 1b 'of the second wall section 1b is arranged inside the housing.
  • the second subregion is restricted to those regions of the housing part which are in contact with comparatively cooler gas or cooled and / or partially cooled gas - for example the deflection region 7 or regions which are adjacent to Exchange means 5 are.
  • an area adjacent to the bypass as shown in Fig.
  • FIG. 16 is provided with a second wall portion 1b as a portion to be cooled.
  • the second wall section 1b and the third wall section 1e together form virtually completely a housing outer wall of the gas side housing part shown here - or in the case of analogy to FIG. 1, the housing 1.
  • the optional partition wall shown in FIG. 16 is thus a housing-internal section 1e 'of the third wall portion 1e executed.
  • the further embodiment of embodiments, not shown here allows the design of a cooled wall portion 1 b, in contrast to an uncooled wall portion 1 e in a particularly suitable manner for use.
  • FIG. 17 shows an exemplary possibility of how a module realized in I-flow design-for example a module of FIG. 16 -can be integrated into an intake module 40.
  • an exhaust gas flow recirculated from the engine 60 is fed to the module via a gas feed 3 and continued there, as described in the previously described embodiments of the first and second variants.
  • the double-walled or thick-walled wall sections 1b are designed with dashed lines. In the context of the embodiment shown in FIG. 17, these are practically all wall sections lying on the outside of the housing. Nevertheless, according to the concept of the second variant of the invention, a section 1e shown in FIG. 16 as a third wall section-referred to as wall section 1b in FIG.
  • a wall section 1eb can be designed for comparatively less complex cooling in comparison to a second wall section 1b. Nevertheless, a wall section 1eb is a wall section cooled in comparison to the non-cooled third wall section 1e.
  • a coolant-cooled charge air cooler 51 is arranged in the lower region, which can be supplied with charge air via a throttle flap 52 and coolant can be supplied and removed via a supply 58 or an exhaust 56.
  • a cylindrical slide 22 is realized, which can be activated via a slide rod 23 and a drive M, so that the gas either via a bypass path 1 or a cooling path 2 is passed.

Abstract

L'invention concerne un dispositif pour refroidir un flux de gaz d'un moteur à combustion interne, comprenant un boîtier (1), une alimentation (3) et une évacuation (4) pour un gaz à refroidir, notamment du gaz d'échappement et/ou de l'air de suralimentation du moteur à combustion interne, une alimentation (18) et une évacuation (16) pour un réfrigérant notamment liquide, un moyen échangeur (5) pour assurer le transfert thermique entre le gaz et le réfrigérant, une première portion de paroi (1a) du boîtier (1), la première portion de paroi étant disposée entre le réfrigérant et le flux de gaz, et une deuxième portion de paroi (1b) du boîtier (1), la deuxième portion de paroi (1b) étant disposée entre le réfrigérant et un environnement, en particulier l'atmosphère ; la première portion de paroi (1a) et la deuxième portion de paroi (1b) sont réalisées d'une seule pièce venue de matière.
EP07786061A 2006-07-14 2007-07-13 Dispositif de refroidissement d'un flux de gaz d'un moteur à combustion interne Withdrawn EP2044319A1 (fr)

Applications Claiming Priority (2)

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DE102006033056 2006-07-14
PCT/EP2007/006237 WO2008006604A1 (fr) 2006-07-14 2007-07-13 Dispositif de refroidissement d'un flux de gaz d'un moteur à combustion interne

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US (1) US8936070B2 (fr)
EP (1) EP2044319A1 (fr)
JP (1) JP5220008B2 (fr)
WO (1) WO2008006604A1 (fr)

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US8936070B2 (en) 2015-01-20
JP5220008B2 (ja) 2013-06-26
US20090277165A1 (en) 2009-11-12
WO2008006604A1 (fr) 2008-01-17
JP2009543994A (ja) 2009-12-10

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