DE102005047840A1 - Air-cooled exhaust gas heat exchanger e.g. for exhaust gas cooler for motor vehicles, has exhaust gas channels which are cross-flown by exhaust gas of internal combustion engine, between which ribs for air cooling are arranged - Google Patents
Air-cooled exhaust gas heat exchanger e.g. for exhaust gas cooler for motor vehicles, has exhaust gas channels which are cross-flown by exhaust gas of internal combustion engine, between which ribs for air cooling are arranged Download PDFInfo
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- DE102005047840A1 DE102005047840A1 DE102005047840A DE102005047840A DE102005047840A1 DE 102005047840 A1 DE102005047840 A1 DE 102005047840A1 DE 102005047840 A DE102005047840 A DE 102005047840A DE 102005047840 A DE102005047840 A DE 102005047840A DE 102005047840 A1 DE102005047840 A1 DE 102005047840A1
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- heat exchanger
- exhaust gas
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- 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
- F02B29/0425—Air cooled heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M26/31—Air-cooled heat exchangers
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- 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
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
- F28D1/0426—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element
- F28D1/0443—Combination of units extending one beside or one above the other
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- 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
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
- F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
- F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
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- 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
- F28F19/006—Preventing deposits of ice
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M26/24—Layout, e.g. schematics with two or more coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M26/27—Layout, e.g. schematics with air-cooled heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F2009/0285—Other particular headers or end plates
- F28F2009/0287—Other particular headers or end plates having passages for different heat exchange media
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- 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
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- 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
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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)
- Manufacturing & Machinery (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
Die Erfindung betrifft einen luftgekühlten Abgaswärmeübertrager, insbesondere einen Abgaskühler für Kraftfahrzeuge nach dem Oberbegriff des Patentanspruches 1 sowie eine Anordnung zur Abgasrückführung nach dem Oberbegriff des Patentanspruches 37.The The invention relates to an air-cooled Exhaust gas heat exchanger, in particular an exhaust gas cooler for motor vehicles according to the preamble of claim 1 and an arrangement for exhaust gas recirculation the preamble of claim 37.
Abgaskühler werden bei heutigen Fahrzeugen, insbesondere Nutzfahrzeugen, im Rahmen eines Abgasrückführsystems (AGR-System) zur Kühlung von zurückgeführten Abgasen eingesetzt. Die Abgasrückführung basiert auf gesetzlichen Bestimmungen zur Verringerung des Kraftstoffverbrauches der Brennkraftmaschine und zur Reduktion der Schadstoffe (insbesondere NOx) in den Abgasen der Brennkraftmaschine. Die bisher in Kraftfahrzeuge eingebauten Abgaskühler werden durch ein flüssiges Kühlmittel gekühlt, welches dem Kühlkreislauf der Brennkraftmaschine entnommen wird. Diese bekannten flüssigkeitsgekühlten Abgaskühler arbeiten sehr effektiv, haben jedoch den Nachteil, dass die Abkühlung der Abgase an die Kühlmitteltemperatur gebunden ist, die im Bereich von 80 bis 100° C liegt. Damit lassen sich nur Abgasaustrittstemperaturen hinter dem Abgaskühler von ca. 120 bis 150° C erreichen.Exhaust coolers are used in today's vehicles, especially commercial vehicles, as part of an exhaust gas recirculation (EGR) system for cooling recirculated exhaust gases. The exhaust gas recirculation is based on legal provisions for reducing the fuel consumption of the internal combustion engine and for reducing the pollutants (in particular NO x ) in the exhaust gases of the internal combustion engine. The previously installed in motor vehicles exhaust gas cooler are cooled by a liquid coolant, which is taken from the cooling circuit of the internal combustion engine. These known liquid-cooled exhaust gas coolers operate very effectively, but have the disadvantage that the cooling of the exhaust gases is bound to the coolant temperature, which is in the range of 80 to 100 ° C. This allows only exhaust gas outlet temperatures behind the exhaust gas cooler of about 120 to 150 ° C reach.
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Ausgehend von diesem Stand der Technik, insbesondere einem luftgekühlten Abgaswärmeübertrager, ist es Aufgabe der vorliegenden Erfindung, einen Abgaswärmeübertrager der eingangs genannten Art hinsichtlich seiner Bauweise und der damit verbundenen Einbaumöglichkeiten im Kraftfahrzeug zu verbessern. Es ist auch Aufgabe der Erfindung, eine Anordnung zur Abgasrückführung dahingehend zu verbessern, dass eine stärkere Absenkung der Abgastemperatur möglich ist. Darüber hinaus soll ein Einfrieren von Kondensat im Abgaswärmeübertrager vermieden werden.outgoing from this prior art, in particular an air-cooled exhaust gas heat exchanger, It is an object of the present invention, an exhaust gas heat exchanger of the type mentioned in terms of its construction and the associated installation options to improve in the motor vehicle. It is also an object of the invention an arrangement for exhaust gas recirculation to the effect to improve that stronger Lowering of exhaust gas temperature possible is. About that In addition, a freeze of condensate in the exhaust gas heat exchanger should be avoided become.
Diese Aufgabe wird durch die Merkmale des Patentanspruches 1 gelöst. Erfindungsgemäß ist vorgesehen, dass der Abgaswärmeübertrager einerseits einen Rippenrohrblock, d. h. einen aus Rohren für das Abgas und Rippen für die Luftkühlung aufgebauten Block und andererseits Sammelkästen aufweist, in welche die Abgasrohre münden. Vorzugsweise sind die Sammelkästen geschweißt oder gelötet und weisen Rohrböden auf, in welche die Rohrenden der Abgasrohre eingelötet oder eingeschweißt, vorzugsweise laserstrahlgeschweißt sind. Als bevorzugter Werkstoff für die Abgasrohre und die Sammelkästen wird Edelstahl verwendet. Für die Berippung auf der Außenseite der Abgasrohre können Wellrippen aus Edelstahl oder auch aus einem Buntmetall Verwendung finden. Zur Erhöhung des Wärmeüberganges auf der Luftseite weisen die Rippen, insbesondere Wellrippen Kiemen auf, welche mittels bekannter Fertigungsverfahren in das Rippenmaterial eingeschnitten werden. Statt Wellrippen können auch so genannte Stegrippen eingesetzt werden, wie sie insbesondere bei luftgekühlten Ladeluftkühlern bekannt sind. Bekiemte Wellrippen sind dagegen insbesondere von Kühlmittelkühlern her bekannt. Mit dieser luftgekühlten Bauweise des erfindungsgemäßen Abgaskühlers wird der Vorteil erreicht, dass eine Abkühlung des rückgeführten Abgases auf niedrigere Temperaturen als durch eine Kühlmittelkühlung (Flüssigkeitskühlung) möglich ist, was die Leistung des Verbrennungsmotors steigert. Darüber hinaus erlaubt die erfindungsgemäße Bauweise, den Abgaskühler zusammen mit weiteren luftgekühlten Wärmeü bertragern zu einer Baueinheit, einem so genannten Kühlmodul, bestehend aus Kühlmittelkühler, Ladeluftkühler und/oder Kondensator, zusammenzufassen. Vorteilhafterweise kann der erfindungsgemäße Abgaskühler vor dem Kühlmittelkühler oder Kondensator angeordnet werden, wobei er nur einen Teil der Stirnfläche einnimmt. Der verbleibende Teil der Stirnfläche kann durch einen Ladeluftkühler abgedeckt werden. Daraus ergibt sich eine äußerst kompakte Bauweise für ein Kühlmodul.This object is solved by the features of claim 1. According to the invention, it is provided that the exhaust gas heat exchanger on the one hand has a finned tube block, ie, a block constructed from tubes for the exhaust gas and fins for the air cooling and, on the other hand, collecting tanks into which the exhaust tubes open. Preferably, the headers are welded or brazed and have tube sheets, in which the tube ends of the exhaust pipes are soldered or welded, preferably laser-welded. Stainless steel is used as the preferred material for the exhaust pipes and the collecting tanks. Corrugated ribs made of stainless steel or a non-ferrous metal can be used for the ribbing on the outside of the exhaust pipes. To increase the heat transfer on the air side, the ribs, in particular corrugated fins on gills, which are cut by means of known manufacturing processes in the fin material. Instead of corrugated ribs and so-called ribbed ribs can be used, as they are known in particular for air-cooled intercoolers. However, corrugated corrugated fins are known in particular from coolant coolers. With this air-cooled design of the exhaust gas cooler according to the invention, the advantage is achieved that a cooling of the recirculated exhaust gas to lower temperatures than by a coolant cooling (liquid cooling) is possible, which increases the performance of the internal combustion engine. In addition, the construction according to the invention, the exhaust gas cooler together with other air-cooled Wärmeü transmitters to a unit, a so-called cooling module consisting of coolant radiator, charge air cow ler and / or capacitor, to summarize. Advantageously, the exhaust gas cooler according to the invention can be arranged in front of the coolant radiator or condenser, wherein it occupies only a part of the end face. The remaining part of the face can be covered by a charge air cooler. This results in an extremely compact design for a cooling module.
Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung sind die Sammelkästen des Abgaswärmeübertragers aus Kunststoff herstellbar, wobei die Kunststoffkästen mit einem metallischen Rohrboden mechanisch verbunden wird, z. B. mittels einer Bördelverbindung und einer eingelegten Dichtung. Die Verwendung von Kunststoff hat den Vorteil einer geringeren Korrosionsanfälligkeit gegenüber dem Abgas. Der Kunststoffwerkstoff ist so gewählt, dass er auch der mechanischen Beanspruchung infolge Druck und Temperatur des Abgases standhält. Der metallische Wärmeübertragerblock, bestehend aus Rohren, Rippen und Rohrboden wird separat durch Lötung oder auch Schweißung hergestellt. Danach werden die Kunststoffkästen aufgesetzt.To a further advantageous embodiment of the invention are the collection boxes the exhaust gas heat exchanger made of plastic, the plastic boxes with a metallic tube sheet is mechanically connected, for. B. by means of a flare and a pickled seal. The use of plastic has the advantage of a lower susceptibility to corrosion compared to the Exhaust. The plastic material is chosen so that it also the mechanical Stress as a result of pressure and temperature of the exhaust gas withstands. Of the metallic heat exchanger block, consisting of pipes, ribs and tubesheet is separated by soldering or also welding produced. Thereafter, the plastic boxes are placed.
Weitere vorteilhafte Ausgestaltungen ergeben sich aus weiteren Unteransprüchen, welche Bemessungsangaben bzw. Bemessungsbereiche für die Dimensionierung der Rippenhöhe, der Rohrhöhe, des Verhältnisses von Rohrhöhe zu Rippenhöhe, der Rippendichte sowie des hydraulischen Durchmessers der Rohre enthalten. Im Rahmen dieser Bemessungsangaben ergibt sich ein auf die Medien Abgas und Luft optimierter Wärmeübertrager.Further advantageous embodiments result from further subclaims, which Ratings or design ranges for the dimensioning of the rib height, the Pipe height, of ratio of pipe height to rib height, the rib density and the hydraulic diameter of the pipes contain. Within the scope of these design data arises on the media exhaust and air optimized heat exchanger.
In weiterer vorteilhafter Ausgestaltung der Erfindung weist der Abgaskühler einen Bypasskanal auf, der vorzugsweise über eine Bypassklappe gesteuert wird. Damit wird der Vorteil erreicht, dass ein Einfrieren des Kühlers mit Kondensat bei niedrigen Außentemperaturen vermieden wird; darüber hinaus wird auch ein schnelleres Aufheizen des Motors erreicht.In Another advantageous embodiment of the invention, the exhaust gas cooler a Bypass on, which is preferably controlled by a bypass flap becomes. This achieves the advantage that a freeze of the cooler with condensate at low outside temperatures is avoided; about that In addition, a faster heating of the engine is achieved.
In weiterer vorteilhafter Ausgestaltung der Erfindung ist dem Abgaswärmeübertrager ein Bypasskanal – ohne Bypassklappe – zugeordnet, wobei die Durchströmung des Bypasskanals über den unterschiedlichen Druckabfall im Bypasskanal und im Abgaswärmeübertrager gesteuert wird. Der Bypasskanal ist derart gestaltet, dass sein Druckabfall bei über dem Gefrierpunkt liegenden Außentemperaturen geringer als der des Abgaswärmeübertragers ist, was beispielsweise durch eine Blende im Eingangsbereich des Bypasskanals erreicht werden kann. Bei eingefrorenen Abgaskanälen wird der Druckabfall im Abgaswärmeübertrager größer als der des Bypasskanals, so dass dieser von Abgas durchströmt wird. Damit wird der Vorteil erreicht, dass bei eingefrorenem Abgaskühler Abgas rückgeführt werden kann. Eine Bypassklappe mit den ihr anhaftenden Problemen entfällt.In Another advantageous embodiment of the invention is the exhaust gas heat exchanger a bypass channel - without Bypass flap - assigned, with the flow over the bypass channel the different pressure drop in the bypass duct and in the exhaust gas heat exchanger is controlled. The bypass channel is designed such that Pressure drop at over the freezing point outside temperatures lower than that of the exhaust gas heat exchanger is, for example, by a panel in the entrance of the Bypass channels can be achieved. For frozen exhaust ducts is the pressure drop in the exhaust gas heat exchanger greater than that of the bypass channel, so that it is flowed through by exhaust gas. In order to the advantage is achieved that when frozen exhaust gas cooler exhaust be returned can. A bypass flap with its attached problems is eliminated.
In weiterer Ausgestaltung der Erfindung ist dem Abgaswärmeübertrager ein Bypass zugeordnet, welcher über ein differenzdruckgesteuertes Ventil geöffnet oder geschlossen wird. Steigt der Druckabfall im Abgaswärmeübertrager infolge Einfrierens von Kondensat in den Abgaskanälen, steigt auch der Differenzdruck, welcher das Ventilschließglied öffnet und somit den Bypass zwischen Abgaszuführ- und -rückführleitung freigibt. Auch damit wird der Vorteil erreicht, dass der Abgaskühler im Falle des Einfrierens umgangen und eine Abgasrückführung aufrechterhalten werden kann. Möglich ist auch, dass das Ventilschließglied extern angesteuert wird.In Another embodiment of the invention is the exhaust gas heat exchanger assigned a bypass, which over a differential pressure controlled valve is opened or closed. If the pressure drop in the exhaust gas heat exchanger increases due to freezing of condensate in the exhaust ducts, increases also the differential pressure which opens the valve closing member and thus releases the bypass between Abgaszuführ- and -rückführleitung. Also with it the advantage is achieved that the exhaust gas cooler in case of freezing bypassed and maintained exhaust gas recirculation can be. Possible is also that the valve closing member is controlled externally.
In weiterer vorteilhafter Ausgestaltung der Erfindung sind zur Beheizung des Abgaswärmeübertragers, insbesondere seiner Abgaskanäle Kühlmittelkanäle, insbesondere Bypasskanäle vorgesehen, welche Wärme an die durch Einfrieren von Kondensat gefährdeten Abgaskanäle heranbringen. Damit wird der Vorteil erreicht, dass ein Einfrieren von Kondensat im Abgaswärmeübertrager verhindert wird.In Further advantageous embodiment of the invention are for heating the exhaust gas heat exchanger, in particular its exhaust ducts Coolant channels, in particular bypass channels provided which heat bring it to the exhaust gas channels which are at risk due to freezing of condensate. This achieves the advantage that freezing of condensate in the exhaust gas heat exchanger is prevented.
In weiterer vorteilhafter Ausgestaltung der Erfindung ist dem Abgaswärmeübertrager eine elektrische Heizung zugeordnet, welche die Abgaskanäle beheizt und damit ebenfalls ein Einfrieren verhindert.In Another advantageous embodiment of the invention is the exhaust gas heat exchanger associated with an electric heater which heats the exhaust ducts and thus also prevents freezing.
In einer vorteilhaften Weiterbildung der Erfindung ist vor dem Rippenrohrblock des Abgaskühlers eine Jalousie, insbesondere eine Klappenjalousie angeordnet. Damit wird ebenfalls der Vorteil erreicht, dass ein Einfrieren des Abgaskühlers mit Kondensat bei sehr tiefen Temperaturen vermieden und ein schnelleres Aufheizen des Motors gewährleistet ist.In An advantageous development of the invention is in front of the finned tube block the exhaust gas cooler a Venetian blind, especially a flap blind arranged. This will be also achieved the advantage that a freezing of the exhaust gas cooler with Condensate avoided at very low temperatures and a faster Heating the engine ensured is.
In weiterer vorteilhafter Ausgestaltung der Erfindung ist in Luftströmungsrichtung vor dem Abgaswärmeübertrager eine verschiebbare Abdeckvorrichtung angeordnet, welche die zwischen den Abgaskanälen angeordneten Kühlluftkanäle abdecken und damit eine Kühlung unterbinden kann. Damit wird der Vorteil erreicht, dass ein Einfrieren von Kondensat in den Abgaskanälen verhindert und die Abgasrückführung aufrechterhalten wird. Die Abdeckvorrichtung kann vorzugsweise über einen Thermostaten, z. B. ein Dehnstoffelement betätigt werden.In Another advantageous embodiment of the invention is in the air flow direction in front of the exhaust gas heat exchanger arranged a sliding cover device, which between the the exhaust ducts cover arranged cooling air ducts and with it a cooling can prevent. This achieves the advantage that freezing of condensate in the exhaust ducts prevents and maintain exhaust gas recirculation becomes. The covering device may preferably be connected via a thermostat, for. B. actuates an expansion element become.
In weiterer vorteilhafter Ausgestaltung der Erfindung sind der Abgaskühler und der Ladeluftkühler zu einem Modul miteinander verbunden, wobei das austretende Abgas in einem separaten Abgaskanal durch den Austrittskasten des Ladeluftkühlers geleitet wird. Dadurch kann Bauraum eingespart werden. Die Trennung von Abgas und Ladeluft im Austrittskasten des Ladeluftkühlers ist erforderlich, um Korrosionen des Abgaskondensats mit dem normalerweise aus Aluminium bestehende Ladeluftkühler zu vermeiden. Der Kanal kann dadurch geschaffen werden, dass eine dicke Aluminiumwand (Tennwand) in den Austrittskastens des Ladeluftkühlers eingebracht wird, die aufgrund ihrer Dicke lange Zeit dem Korrosionsangriff von saurem Abgaskondensat standhält. Alternativ ist auch denkbar, einen Kunststoff- oder ei nen Edelstahl-Kanal in den Austrittskastens des Ladeluftkühlers einzubringen, durch den das Abgas strömt. Dieser Kanal kann auch außen (als zusätzliches Teil) an den Austrittskasten des Ladeluftkühlers oder in einer Ausbuchtung des Austrittskastens angebracht werden. Vorteilhaft ist, wenn die Ladeluft und das Abgas erst soweit stromabwärts vom Ladeluftkühler gemischt werden, dass kein Kondensat in den Ladeluftkühler zurückfließen kann. Die Mischstelle aus Ladeluft und Abgas kann auch in Form einer Venturidüse oder einer ähnlichen Einrichtung ausgeführt werden, so dass das Abgas teilweise aus dem Abgaskühler gesaugt wird. Dadurch ließe sich der Abgasmassenstrom weiter erhöhen.In a further advantageous embodiment of the invention, the exhaust gas cooler and the intercooler are connected to a module, wherein the exiting exhaust gas is passed in a separate exhaust passage through the outlet box of the intercooler. This space can be saved. The separation of exhaust gas and charge air in the outlet box of the intercooler is required to corrosion of the exhaust gas condensate with the norma Aluminum intercoolers. The channel can be created by introducing a thick aluminum wall (partition wall) into the outlet box of the intercooler, which for a long time, due to its thickness, withstands the corrosive attack of acid exhaust gas condensate. Alternatively, it is also conceivable to introduce a plastic or egg nen stainless steel channel in the outlet box of the intercooler through which the exhaust gas flows. This channel can also be attached externally (as an additional part) to the outlet box of the intercooler or in a recess of the outlet box. It is advantageous if the charge air and the exhaust gas are mixed as far downstream of the intercooler that no condensate can flow back into the intercooler. The mixing point of charge air and exhaust gas can also be carried out in the form of a Venturi nozzle or a similar device, so that the exhaust gas is partially sucked out of the exhaust gas cooler. This would further increase the exhaust gas mass flow.
In einer weiteren vorteilhaften Ausgestaltung der Erfindung sind der Abgaskühler und ein Ladeluftkühler zu einem gemeinsamen Kühler integriert, d. h. mit gemeinsamen Sammelkästen und mit einem gemeinsamen Rippenrohrblock, dessen Rohre sowohl von Abgas als auch von Ladeluft bzw. von einem Gemisch aus Abgasen und Ladeluft durchströmt werden. Die Zufuhr von Abgas und Ladeluft kann entweder über einen gemeinsamen Eintrittsstutzen, was den Vorteil einer Mischung beider Gasströme mit sich bringt, oder über separate Eintrittsstutzen erfolgen. Durch diesen gemeinsamen Wärmeübertrager ergeben sich Kosten- und Gewichtsvorteile gegenüber zwei separaten Wärmeübertragern. Darüber hinaus ergibt sich der Vorteil, dass der aufgrund der heißen und korrosiven Abgase vorzugsweise in Edelstahl ausgeführte Kühler auch höheren Ladeluftdrücken standhält. Die derzeitige Motorenentwicklung geht in diese Richtung, d. h. tendiert zu höherer Aufladung, welche mit den derzeitigen Ladeluftkühlern in Aluminiumbauweise nicht immer beherrschbar ist.In a further advantageous embodiment of the invention are the exhaust gas cooler and a charge air cooler to a common cooler integrated, d. H. with common collection boxes and with a common Finned tube block whose tubes are both exhaust gas and charge air or to be flowed through by a mixture of exhaust gases and charge air. The supply of exhaust gas and charge air can either via a common inlet nozzle, which brings the advantage of a mixture of both gas streams, or via separate Entry socket done. Through this common heat exchanger There are cost and weight advantages over two separate heat exchangers. About that In addition, there is the advantage that due to the hot and corrosive exhaust preferably in stainless steel designed radiator as well higher Charge air withstands. The current engine development goes in this direction, d. H. tends to higher Charging, which with the current charge air coolers in aluminum construction is not always manageable.
Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung ist dem Abgaswärmeübertrager ein Oxidationskatalysator vorgeschaltet. Dies hat den Vorteil, dass Rußablagerungen in den Abgas führenden Rohren reduziert werden. Vorteilhafterweise kann der Oxidationskatalysator auch in einem eintrittsseitigen Sammelkasten angeordnet werden.To a further advantageous embodiment of the invention is the Exhaust gas heat exchanger on Upstream oxidation catalyst. This has the advantage that soot deposits leading into the exhaust Pipes are reduced. Advantageously, the oxidation catalyst be arranged in an entrance-side collection box.
Die Aufgabe der Erfindung wird auch durch eine Anordnung für ein AGR-System gelöst, bei welchem dem erfindungsgemäßen luftgekühlten Abgaskühler ein herkömmlicher flüssigkeitsgekühlter Abgaskühler vorgeschaltet ist. Damit wird eine zweistufige Abkühlung des Abgases bei der Abgasrückführung erreicht, so dass die Eintrittstemperaturen für den luftgekühlten Abgaskühler gesenkt werden können. Damit ergibt sich auch eine Angleichung der Abgas- und der Ladelufttemperaturen, was insbesondere bei Verwendung eines gemeinsamen Wärmeübertragers für Abgas und Ladeluft vorteilhaft ist. Durch die zweistufige Abgaskühlung erreicht das Abgas bei seiner Rückführung in den Ansaugtrakt der Verbrennungskraftmaschine eine niedrigere Temperatur, was den Füllungsgrad der Zylinder und damit die Leistung des Motors steigert.The The object of the invention is also achieved by an arrangement for an EGR system, in which the air-cooled exhaust gas cooler according to the invention a conventional liquid cooled exhaust gas cooler upstream is. Thus, a two-stage cooling of the exhaust gas is achieved in the exhaust gas recirculation, so that the inlet temperatures for the air-cooled exhaust gas cooler lowered can be. This also results in an alignment of the exhaust gas and the charge air temperatures, especially when using a common heat exchanger for exhaust and charge air is advantageous. Achieved by the two-stage exhaust gas cooling the exhaust gas in its return in the intake of the internal combustion engine, a lower temperature, what the degree of filling the cylinder and thus the power of the engine increases.
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im Folgenden näher beschrieben. Es zeigenembodiments The invention are illustrated in the drawings and will be described in more detail below. Show it
Nach
einem bevorzugten Ausführungsbeispiel
der Erfindung sind für
die optimale Dimensionierung des Abgaskühlers
Nach einem bevorzugten Ausführungsbeispiel der Erfindung liegt das Verhältnis von Höhe H zu Länge L in einem Bereich von 0,1 bis 0,8, vorzugsweise im Bereich von 0,2 bis 0,4. Der Kühler ist somit relativ lang gestreckt und kann daher hinsichtlich seiner Längenerstreckung an die Länge eines Kühlmoduls bzw. eines Kühlmittelkühlers angepasst werden. Vorteilhafterweise wird dabei oberhalb des Abgaskühlers ein Ladeluftkühler angeordnet, welcher den verbleibenden Teil der Stirnfläche zumindest teilweise überdeckt.According to a preferred embodiment of the invention, the ratio of height H to length L is in a range of 0.1 to 0.8, preferably in the range of 0.2 to 0.4. The cooler is thus stretched relatively long and can therefore be adjusted in terms of its length extension to the length of a cooling module or a coolant radiator. Advantageously, it is above the exhaust gas Cooler disposed a charge air cooler, which at least partially covers the remaining part of the end face.
In der Zeichnung nicht dargestellt ist ein auf der Abgasaustrittsseite des Abgaskühlers angeordneter Kondensatablass, wobei das Kondensat entweder direkt nach außen oder in die Abgasleitung (Auspuff) abgeführt wird.In the drawing is not shown on the exhaust gas outlet side of the exhaust gas cooler arranged condensate drain, the condensate either directly outward or is discharged into the exhaust pipe (exhaust).
Ebenfalls
in der Zeichnung nicht dargestellt ist ein Abgasrückführventil,
so genanntes AGR-Ventil, welches entweder im Eintrittsbereich oder
im Austrittsbereich, also im Bereich der Abgasstutzen
In
der Zeichnung sind der luftgekühlte
Abgaskühler
Allerdings ist es auch möglich, den erfindungsgemäßen luftgekühlten Abgaskühler an anderer Stelle als am Kühlmodul im Motorraum anzuordnen und ihm gegebenenfalls einen eigenen Lüfter zuzuordnen.Indeed it is also possible the air-cooled exhaust gas cooler according to the invention elsewhere than at the cooling module to arrange in the engine compartment and assign it, if necessary, its own fan.
Ein
weiteres, nicht in der Zeichnung dargestelltes Ausführungsbeispiel
der Erfindung betrifft einen luftgekühlten Abgaswärmeübertrager
mit einem Bypasskanal für
das Abgas, etwa entsprechend dem Ausführungsbeispiel gemäß
Claims (58)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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DE102005047840A DE102005047840A1 (en) | 2004-10-07 | 2005-10-05 | Air-cooled exhaust gas heat exchanger e.g. for exhaust gas cooler for motor vehicles, has exhaust gas channels which are cross-flown by exhaust gas of internal combustion engine, between which ribs for air cooling are arranged |
DE202005021555U DE202005021555U1 (en) | 2004-10-07 | 2005-10-05 | Air-cooled exhaust gas heat exchanger, in particular exhaust gas cooler for motor vehicles |
Applications Claiming Priority (5)
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DE102004049108 | 2004-10-07 | ||
DE102004049108.9 | 2004-10-07 | ||
DE102005023795.9 | 2005-05-19 | ||
DE102005023795 | 2005-05-19 | ||
DE102005047840A DE102005047840A1 (en) | 2004-10-07 | 2005-10-05 | Air-cooled exhaust gas heat exchanger e.g. for exhaust gas cooler for motor vehicles, has exhaust gas channels which are cross-flown by exhaust gas of internal combustion engine, between which ribs for air cooling are arranged |
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DE102005047840A1 true DE102005047840A1 (en) | 2006-06-29 |
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DE202005021555U Expired - Lifetime DE202005021555U1 (en) | 2004-10-07 | 2005-10-05 | Air-cooled exhaust gas heat exchanger, in particular exhaust gas cooler for motor vehicles |
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WO2009062697A1 (en) * | 2007-11-12 | 2009-05-22 | Behr Gmbh & Co. Kg | Exhaust gas cooler for a motor vehicle |
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DE9406197U1 (en) | 1994-04-14 | 1994-06-16 | Behr Gmbh & Co | Heat exchanger for cooling exhaust gas from a motor vehicle engine |
DE19750588B4 (en) | 1997-11-17 | 2016-10-13 | MAHLE Behr GmbH & Co. KG | Device for exhaust gas recirculation for an internal combustion engine |
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DE10203003B4 (en) | 2002-01-26 | 2007-03-15 | Behr Gmbh & Co. Kg | Exhaust gas heat exchanger |
-
2005
- 2005-10-05 DE DE102005047840A patent/DE102005047840A1/en not_active Withdrawn
- 2005-10-05 DE DE202005021555U patent/DE202005021555U1/en not_active Expired - Lifetime
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