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EP1816425B1 - Exhaust gas heat exchanger in an exhaust gas recirculation assembly - Google Patents

Exhaust gas heat exchanger in an exhaust gas recirculation assembly Download PDF

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Publication number
EP1816425B1
EP1816425B1 EP07001251.3A EP07001251A EP1816425B1 EP 1816425 B1 EP1816425 B1 EP 1816425B1 EP 07001251 A EP07001251 A EP 07001251A EP 1816425 B1 EP1816425 B1 EP 1816425B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
heat exchanger
gas heat
exchanger according
stack
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.)
Active
Application number
EP07001251.3A
Other languages
German (de)
French (fr)
Other versions
EP1816425A3 (en
EP1816425A2 (en
Inventor
Jörg Dr.-Ing. Soldner
Sven Dr.-Ing. Thumm
Roland Dipl.-Ing. Strähle
Harald Dipl.-Ing. Schatz
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.)
Modine Manufacturing Co
Original Assignee
Modine Manufacturing Co
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Filing date
Publication date
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Publication of EP1816425A2 publication Critical patent/EP1816425A2/en
Publication of EP1816425A3 publication Critical patent/EP1816425A3/en
Application granted granted Critical
Publication of EP1816425B1 publication Critical patent/EP1816425B1/en
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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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • 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
    • 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
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
    • 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
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2210/00—Heat exchange conduits
    • F28F2210/10—Particular layout, e.g. for uniform temperature distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/26—Safety or protection arrangements; Arrangements for preventing malfunction for allowing differential expansion between elements
    • 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

Definitions

  • the invention relates to an exhaust gas heat exchanger having the features of the preamble of claim 1.
  • the described exhaust gas heat exchanger is from the EP 1 348 924 A2 known. He essentially fulfilled his task during the implementation. Recently, however, increase the exhaust gas temperatures of the motor vehicle engines and consequently also the temperature differences between the coolant and the exhaust gas, which leads to the known, caused by excessive thermal cycling cracks and the like damage that can cause the failure of the entire system.
  • the US 2005/0189097 A1 describes a heat exchanger with a stack of flow dividing plates, which are formed over most of their length as corrugated sheets. In the inlet and outlet areas, two of these flow dividing plates each form a short flat tube section. In these sections corrugated fins are arranged between the flow dividing plates.
  • the EP 1 528 348 A1 describes a heat exchanger according to the preamble of claim 1. There are arranged flow guide in the form of fin sheets between and in the flat tubes and also between the stack and the housing to compensate for thermal stresses.
  • the object of the invention is to provide an improved exhaust gas heat exchanger, which contributes to the solution of the above can address the problem raised and is also inexpensive to produce.
  • the flow guide elements are formed as a corrugated plate in which channels are arranged with inlets and outlets, which extend in the longitudinal or transverse direction of the exhaust gas heat exchanger, wherein at least some of the channels at least in the inlet region of the coolant have a curved course, the flow velocity of Incoming coolant specifically increases and the flow is directed or distributed over as possible the entire plate area, whereby the temperature differences can be selectively lowered.
  • the corrugated plate should have flat edges in the inlet area, so that the mentioned distribution of the coolant is supported.
  • This embodiment is particularly effective when the inlet region of the coolant is in the vicinity of the inlet region of the exhaust gas, so that the exhaust gas heat exchanger can be flowed through in direct current. It has been found that the flow in the DC with respect to the thermal cycling loads is more favorable, which is why this flow was preferably provided. Because of the non-straight channels in the inlet region there is a high flow velocity of the coolant, which also prevents the liquid coolant passes into the gaseous state.
  • the corrugated plate at the two longitudinal edges is designed so that the flow of the coolant between the plate edges and the housing is prevented. This contributes to the concentration of the flow on the heat exchanged areas in the channels.
  • the structural complexity remains within reasonable limits, when the longitudinal edges of the plate are bent and abut the adjacent flat tube and connected, preferably soldered.
  • the channels are formed substantially straight after the entry region and extend in one embodiment in the longitudinal direction of the exhaust gas heat exchanger. In another embodiment, the channels are oriented substantially in the transverse direction of the exhaust gas heat exchanger.
  • the plate stack of the exhaust gas heat exchanger consists of a plurality of two connected at their longitudinal edges 10 plates 1, wherein two such plates each form a flat tube 2 .
  • Each flat tube 2 includes a turbulator 3 through which or the the exhaust gas flows.
  • a coolant channel 5 is arranged in each case, which is equipped with flow guide elements 6 . All mentioned components are made of stainless steel sheet.
  • the flow directing elements 6 consist of a corrugated plate 7.
  • channels 13 are connected to A - and outlets 14 have been formed 15 wherein at least some of the channels 13 in the entry region 16 of the refrigerant having an odd, dividing up the flow or distributing the course .
  • the corrugated plates 7 have bent longitudinal edges 17 , each of which can surround the flat tube 2 arranged above its longitudinal edges. ( Fig. 3 ) In the inlet region 16 , however, no bent edges but undeformed edges were provided on the flow elements 6 .
  • the components mentioned are according to the Fig. 4 or 7 assembled to the plate stack.
  • the two figures differ from each other in that in the Fig. 4
  • Two-part flow guide 6 are each arranged in a coolant channel 5 and in the Fig. 7 it is a one-piece flow guide 6.
  • In the Fig. 1 one of the two-part flow guide 6 was shown and in the Fig. 6 the one-piece flow guide 6 was shown.
  • At both ends of the plate stack also made of stainless steel tubesheet 30 and a collection box or a diffuser 31 is attached.
  • the plate stack is further closed by two stainless steel side members 25 top and bottom.
  • the construction described is first soldered, with all the parts in the Fig. 4 or 7 are shown.
  • a seal 40 is applied around the circumference of the plate stack, which is intended to ensure that the coolant is concentrated on the coolant channels 5 .
  • a flow of the coolant between the housing 11 and the circumference of the plate stack should be suppressed as much as possible. This effect is supported by the described special construction of the longitudinal edges 17 on the corrugated plates 7 .
  • the prefabricated unit of the plate stack is inserted into the housing 11 described in more detail below so that changes in length can be compensated, which are set under thermal cycling.
  • the housing 11 just mentioned is a die-cast aluminum construction used in the Fig. 10 is shown. It has a tapered outlet flange 60 for the exhaust gas, which is dimensioned so that the am Plate stack soldered diffuser 31 fits into it. Further, a groove 61 has been formed, in which a sealing ring or other suitable seal 62 is located. ( Fig. 9 From this representation, it can be seen that changes in length caused by temperature changes can be compensated for by permitting movements in the longitudinal direction of the plate stack or of the housing 11 . The two double block arrows on the left side in the Fig. 9 should show that. Due to the specially designed flow guide 6 was additionally ensured that the stresses caused by thermal cycling stresses or changes in shape are reduced.
  • a further flange 50 has been formed, to which the tube plate 30 of the plate stack and a further exhaust gas collection box 51 are attached.
  • fastening means 52 are formed on the housing 11 in order to fasten the exhaust gas heat exchanger to a connection structure, not shown.
  • connecting pieces 70 have also been formed on the housing 11 in order to allow the coolant to flow into or out of the coolant channels 5 of the plate stack. The inflow and outflow is also ensured by the edges 18 , which are undeformed in the inlet 16 and in the outlet area, on the flow guide elements 6 , which are arranged in all the coolant channels 5 .
  • FIGS. 11 and 12 refer to an embodiment with extending in the transverse direction of the exhaust gas heat exchanger channels 13, which are formed in the flow guide 6 .
  • the Fig. 11 shows a plan view of such a flow guide 6.
  • the black block arrows indicate the direction of the coolant again.
  • Only some of the channels 13 have inlets or outlets 14, 15 within the corrugated plate 6 .
  • the inlets or outlets have been arranged on the two longitudinal edges of the corrugated plate 6 .
  • the Fig. 12 shows a representation of the soldered exhaust gas heat exchanger, the external similarities with the Fig. 8 Has. There are, however, the flow guide 6 from the Fig. 11 been used.
  • the housing arranged around this stack must be modified accordingly.
  • FIG. 13 one of the Fig. 3 similar section of a stack in which flat tubes 2 are present, which are formed from a sheet metal strip and welded by a longitudinal seam 20 .

Landscapes

  • 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)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Description

Die Erfindung betrifft einen Abgaswärmetauscher, der die Merkmale des Oberbegriffs aus dem Patentanspruch 1 aufweist.The invention relates to an exhaust gas heat exchanger having the features of the preamble of claim 1.

Der beschriebene Abgaswärmetauscher ist aus dem EP 1 348 924 A2 bekannt. Er hat seine Aufgabe im durchgeführten Einsatzfall im Wesentlichen erfüllt. Neuerdings steigen jedoch die Abgastemperaturen der Kraftfahrzeugmotoren und demzufolge auch die Temperaturdifferenzen zwischen dem Kühlmittel und dem Abgas, was zu den bekannten, durch zu hohe Temperaturwechselbelastungen verursachte Rissen und dergleichen Beschädigungen führt, die den Ausfall des gesamten Systems zur Folge haben können.The described exhaust gas heat exchanger is from the EP 1 348 924 A2 known. He essentially fulfilled his task during the implementation. Recently, however, increase the exhaust gas temperatures of the motor vehicle engines and consequently also the temperature differences between the coolant and the exhaust gas, which leads to the known, caused by excessive thermal cycling cracks and the like damage that can cause the failure of the entire system.

Man hat auch bereits daran gearbeitet, Abgaswärmetauscher hinsichtlich ihrer Temperaturwechselbelastungsfähigkeit zu verbessern. Eine solche Lösung ist beispielsweise aus der WO 03/036214A1 bekannt. Dort wurden Schlitze und einem Faltenbalg im Gehäuse angeordnet, wodurch das Dehnungsverhalten der Einzelteile des Abgaswärmetauschers sicherlich zu verbessern ist. In der WO 03/064953 wurde hingegen lediglich eine oder mehrere Dehnungssicken im Gehäusemantel vorgesehen. In der WO 2003/091650 wurde eine Schiebesitzanordnung vorgeschlagen. Alle diese Lösungen scheinen zweckdienlich zu sein, ohne jedoch sämtliche zu stellenden Anforderungen erfüllen zu können.It has also been working to improve exhaust gas heat exchanger in terms of their thermal cycling capacity. Such a solution is for example from the WO 03 / 036214A1 known. There slits and a bellows were arranged in the housing, whereby the expansion behavior of the items of the exhaust gas heat exchanger is certainly to improve. In the WO 03/064953 On the other hand, only one or more expansion beads were provided in the housing jacket. In the WO 2003/091650 a sliding seat arrangement has been proposed. All these solutions seem to be useful, but without being able to meet all the requirements to be met.

Die US 2005/018 9097 A1 beschreibt einen Wärmetauscher mit einem Stapel aus Strömungsteilungsblechen, die über den größten Teil ihrer Länge als Wellbleche ausgebildet sind. Im Einlass - und Auslassbereich bilden jeweils zwei dieser Strömungsteilungsbleche einen kurzen Flachrohrabschnitt. In diesen Abschnitten sind Wellrippen zwischen den Strömungsteilungsblechen angeordnet.The US 2005/0189097 A1 describes a heat exchanger with a stack of flow dividing plates, which are formed over most of their length as corrugated sheets. In the inlet and outlet areas, two of these flow dividing plates each form a short flat tube section. In these sections corrugated fins are arranged between the flow dividing plates.

Die EP 1 528 348 A1 beschreibt einen Wärmetauscher gemäß dem Oberbegriff des Patentanspruchs 1. Dort sind Strömungsleitelemente in Form von Rippenblechen zwischen und in den Flachrohren und auch zwischen dem Stapel und dem Gehäuse angeordnet, um Thermospannungen auszugleichen.The EP 1 528 348 A1 describes a heat exchanger according to the preamble of claim 1. There are arranged flow guide in the form of fin sheets between and in the flat tubes and also between the stack and the housing to compensate for thermal stresses.

Die Aufgabe der Erfindung besteht in der Schaffung eines verbesserten Abgaswärmetauschers, der einen Beitrag zur Lösung des vorstehend angesprochenen Problems leisten kann und der darüber hinaus kostengünstig herstellbar ist.The object of the invention is to provide an improved exhaust gas heat exchanger, which contributes to the solution of the above can address the problem raised and is also inexpensive to produce.

Die Lösung dieser Aufgabe ergibt sich erfindungsgemäß mit einem Abgaswärmetauscher, der die Merkmale des Anspruchs 1 aufweist.The solution of this object is achieved according to the invention with an exhaust gas heat exchanger having the features of claim 1.

Weil die Strömungsleitelemente als gewellte Platte ausgebildet sind, in der Kanäle mit Ein - und Austritten angeordnet sind, die sich in Längsrichtung oder in Querrichtung des Abgaswärmetauschers erstrecken, wobei wenigstens einige der Kanäle wenigstens im Eintrittsbereich des Kühlmittels einen gebogenen Verlauf aufweisen, wird die Strömungsgeschwindigkeit des eintretenden Kühlmittels gezielt erhöht und die Strömung wird über möglichst den gesamten Plattenbereich gelenkt bzw. verteilt, wodurch die Temperaturdifferenzen gezielt abgesenkt werden können.Because the flow guide elements are formed as a corrugated plate in which channels are arranged with inlets and outlets, which extend in the longitudinal or transverse direction of the exhaust gas heat exchanger, wherein at least some of the channels at least in the inlet region of the coolant have a curved course, the flow velocity of Incoming coolant specifically increases and the flow is directed or distributed over as possible the entire plate area, whereby the temperature differences can be selectively lowered.

Die gewellte Platte soll im Eintrittsbereich ebene Ränder aufweisen, damit die erwähnte Verteilung des Kühlmittels unterstützt wird.The corrugated plate should have flat edges in the inlet area, so that the mentioned distribution of the coolant is supported.

Besonders wirksam ist diese Ausgestaltung, wenn sich der Eintrittsbereich des Kühlmittels in der Nähe des Eintrittsbereichs des Abgases befindet, sodass der Abgaswärmetauscher im Gleichstrom durchströmbar ist. Es hat sich erwiesen, dass die Durchströmung im Gleichstrom bezüglich der Temperaturwechselbelastungen günstiger ist, weshalb diese Durchströmung vorzugsweise vorgesehen wurde. Wegen der nicht geraden Kanäle im Eintrittsbereich liegt dort eine hohe Strömungsgeschwindigkeit des Kühlmittels vor, die auch verhindert, dass das flüssige Kühlmittel in den gasförmigen Zustand übergeht.This embodiment is particularly effective when the inlet region of the coolant is in the vicinity of the inlet region of the exhaust gas, so that the exhaust gas heat exchanger can be flowed through in direct current. It has been found that the flow in the DC with respect to the thermal cycling loads is more favorable, which is why this flow was preferably provided. Because of the non-straight channels in the inlet region there is a high flow velocity of the coolant, which also prevents the liquid coolant passes into the gaseous state.

Bei Abgaswärmetauschern mit in Längsrichtung orientierten Kanälen in der gewellten Platte, ist außerdem vorgesehen worden, dass die gewellte Platte an den beiden Längsrändern so ausgestaltet ist, dass die Strömung des Kühlmittels zwischen den Plattenrändern und dem Gehäuse unterbunden ist. Dies trägt zur Konzentration der Strömung auf die zum Wärmeaustausch ausgestalteten Bereiche in den Kanälen bei.In exhaust gas heat exchangers with longitudinally oriented channels in the corrugated plate, it has also been provided that the corrugated plate at the two longitudinal edges is designed so that the flow of the coolant between the plate edges and the housing is prevented. This contributes to the concentration of the flow on the heat exchanged areas in the channels.

Der bauliche Aufwand bleibt im vertretbaren Rahmen, wenn die Längsränder der Platte abgebogen werden und am angrenzenden Flachrohr anliegen und damit verbunden, vorzugsweise verlötet sind.The structural complexity remains within reasonable limits, when the longitudinal edges of the plate are bent and abut the adjacent flat tube and connected, preferably soldered.

Die Kanäle sind im Anschluss an den Eintrittsbereich im Wesentlichen gerade ausgebildet und erstrecken sich in einem Ausführungsbeispiel in Längsrichtung des Abgaswärmetauschers. Bei einem anderen Ausführungsbeispiel sind die Kanäle im Wesentlichen in Querrichtung des Abgaswärmetauschers orientiert.The channels are formed substantially straight after the entry region and extend in one embodiment in the longitudinal direction of the exhaust gas heat exchanger. In another embodiment, the channels are oriented substantially in the transverse direction of the exhaust gas heat exchanger.

Weitere Merkmale sind in den Patentansprüchen vorhanden.Other features are present in the claims.

Aus der folgenden Beschreibung von Ausführungsbeispielen ergeben sich weitere Merkmale und Vorteile. Die beigefügten Abbildungen zeigen Folgendes:

Fig. 1
Draufsicht auf ein Strömungsleitelement;
Fig. 2
Schnitt durch ein Strömungsleitelement;
Fig. 3
Ausschnitt aus einem Stapel;
Fig. 4
Explosionsdarstellung eines Stapels;
Fig. 5
Teilsweise geschnittene Ansicht des Stapels im Gehäuse,
Fig. 6
Draufsicht auf ein anderes Strömungsleitelement;
Fig. 7
wie Fig. 4, aber mit dem Strömungsleitelement aus Fig. 6;
Fig. 8
Ansicht auf einen bereits gelöteten Stapel;
Fig. 9
Teil-Längsschnitt durch den Abgaswärmetauscher;
Fig. 10
Ansicht des Gehäuses des Abgaswärmetauschers;
Fig. 11
ein anderes nicht erfindungsgemäßes Strömungsleitelement in einer Draufsicht;
Fig. 12
ein bereits gelöteter Stapel in einem anderen Ausführungsbeispiel;
Fig. 13
Ausschnitt aus einem Stapel;
From the following description of exemplary embodiments, further features and advantages result. The attached figures show the following:
Fig. 1
Top view of a flow guide;
Fig. 2
Section through a flow guide;
Fig. 3
Section of a pile;
Fig. 4
Exploded view of a stack;
Fig. 5
Partial sectional view of the stack in the housing,
Fig. 6
Top view of another flow guide;
Fig. 7
as Fig. 4 but with the flow guide off Fig. 6 ;
Fig. 8
View on an already soldered stack;
Fig. 9
Partial longitudinal section through the exhaust gas heat exchanger;
Fig. 10
View of the housing of the exhaust gas heat exchanger;
Fig. 11
another not according to the invention flow guide in a plan view;
Fig. 12
an already soldered stack in another embodiment;
Fig. 13
Section of a pile;

Die Integration des Abgaswärmetauschers in eine Abgasrückführungsanordnung wurde nicht gezeigt, da hierzu auf Lösungen aus dem Stand der Technik zurückgegriffen werden kann. In dem Ausführungsbeispiel gemäß den Fig. 1 - 12 wurden Platten eingesetzt, wobei jeweils zwei Platten ein Flachrohr bilden, weshalb dort von Plattenstapel gesprochen wird. Demgegenüber zeigt die Fig. 13 eine Ausführung, in der die Flachrohre einstückig und mit einer Längsnaht geschweißt ausgebildet worden sind.The integration of the exhaust gas heat exchanger into an exhaust gas recirculation arrangement has not been shown, since it can be resorted to solutions from the prior art. In the embodiment according to the Fig. 1 - 12 plates were used, with two plates forming a flat tube, which is why there is talked of plate stack. In contrast, the shows Fig. 13 an embodiment in which the flat tubes have been formed integrally and welded with a longitudinal seam.

Der Plattenstapel des Abgaswärmetauschers besteht, aus einer Vielzahl von zwei an ihren Längsrändern 10 verbundenen Platten 1, wobei zwei solche Platten jeweils ein Flachrohr 2 bilden. Jedes Flachrohr 2 enthält einen Turbulator 3, durch das bzw. den das Abgas strömt. Zwischen zwei Flachrohren 2 ist jeweils ein Kühlmittelkanal 5 angeordnet ist, der mit Strömungsleitelementen 6 ausgestattet ist. Alle erwähnten Bestandteile werden aus Edelstahlblech hergestellt.The plate stack of the exhaust gas heat exchanger consists of a plurality of two connected at their longitudinal edges 10 plates 1, wherein two such plates each form a flat tube 2 . Each flat tube 2 includes a turbulator 3 through which or the the exhaust gas flows. Between two flat tubes 2 , a coolant channel 5 is arranged in each case, which is equipped with flow guide elements 6 . All mentioned components are made of stainless steel sheet.

Die Strömungsleitelemente 6 bestehen aus einer gewellten Platte 7. In der gewellten Platte 7 sind Kanäle 13 mit Ein - und Austritten 14, 15 ausgebildet worden, wobei wenigstens einige der Kanäle 13 im Eintrittsbereich 16 des Kühlmittels einen ungeraden, die Strömung aufteilenden oder verteilenden Verlauf aufweisen. Die gewellten Platten 7 weisen abgebogene Längsränder 17 auf, die jeweils das darüber angeordnete Flachrohr 2 an dessen Längsränder einfassen können. (Fig. 3) Im Eintrittsbereich 16 wurden an den Strömungselementen 6 dagegen keine abgebogenen Ränder sondern unverformte Ränder vorgesehen.The flow directing elements 6 consist of a corrugated plate 7. In the corrugated plate 7 channels 13 are connected to A - and outlets 14 have been formed 15 wherein at least some of the channels 13 in the entry region 16 of the refrigerant having an odd, dividing up the flow or distributing the course , The corrugated plates 7 have bent longitudinal edges 17 , each of which can surround the flat tube 2 arranged above its longitudinal edges. ( Fig. 3 ) In the inlet region 16 , however, no bent edges but undeformed edges were provided on the flow elements 6 .

Die erwähnten Bestandteile werden gemäß den Fig. 4 bzw. 7 zum Plattenstapel zusammengesetzt. Die beiden Figuren unterscheiden sich dadurch voneinander, dass in der Fig. 4 zweiteilige Strömungsleitelemente 6 jeweils in einem Kühlmittelkanal 5 angeordnet wurden und in der Fig. 7 handelt es sich um ein einteiliges Strömungsleitelement 6. In der Fig. 1 wurde eines der zweiteiligen Strömungsleitelemente 6 gezeigt und in der Fig. 6 wurde das einteilige Strömungsleitelement 6 dargestellt. An beiden Enden des Plattenstapels wird ein ebenfalls aus Edelstahl hergestellter Rohrboden 30 und ein Sammelkasten oder ein Diffusor 31 angesetzt. Der Plattenstapel wird ferner von zwei Edelstahl-Seitenteilen 25 oben und unten abgeschlossen. Die beschriebene Konstruktion wird zunächst gelötet, mit all den Teilen, die in den Fig. 4 oder 7 gezeigt sind. Anschließend wird in einem weiteren Verfahrensschritt eine Abdichtung 40 um den Umfang des Plattenstapels herum angebracht, die dafür sorgen soll, dass das Kühlmittel auf die Kühlmittelkanäle 5 konzentriert wird. Eine Strömung des Kühlmittels zwischen dem Gehäuse 11 und dem Umfang des Plattenstapels soll möglichst unterdrückt werden. Diese Wirkung wird durch die beschriebene spezielle Konstruktion der Längsränder 17 an den gewellten Platten 7 unterstützt. In einem abschließenden Verfahrensschritt wird die vorgefertigte Einheit des Plattenstapels in das weiter unten näher beschriebene Gehäuse 11 so eingesetzt, dass Längenänderungen kompensiert werden können, die sich unter Temperaturwechselbelastungen einstellen.The components mentioned are according to the Fig. 4 or 7 assembled to the plate stack. The two figures differ from each other in that in the Fig. 4 Two-part flow guide 6 are each arranged in a coolant channel 5 and in the Fig. 7 it is a one-piece flow guide 6. In the Fig. 1 one of the two-part flow guide 6 was shown and in the Fig. 6 the one-piece flow guide 6 was shown. At both ends of the plate stack, also made of stainless steel tubesheet 30 and a collection box or a diffuser 31 is attached. The plate stack is further closed by two stainless steel side members 25 top and bottom. The construction described is first soldered, with all the parts in the Fig. 4 or 7 are shown. Subsequently, in a further method step, a seal 40 is applied around the circumference of the plate stack, which is intended to ensure that the coolant is concentrated on the coolant channels 5 . A flow of the coolant between the housing 11 and the circumference of the plate stack should be suppressed as much as possible. This effect is supported by the described special construction of the longitudinal edges 17 on the corrugated plates 7 . In a final process step, the prefabricated unit of the plate stack is inserted into the housing 11 described in more detail below so that changes in length can be compensated, which are set under thermal cycling.

Das gerade angesprochene Gehäuse 11 ist eine Druckgusskonstruktion aus Aluminium, das in der Fig. 10 gezeigt ist. Es besitzt einen sich verjüngenden Austrittsflansch 60 für das Abgas, welcher so dimensioniert ist, dass der am Plattenstapel angelötete Diffusor 31 dort hinein passt. Ferner wurde eine Nut 61 ausgebildet, in der sich ein Dichtring oder eine andere geeignete Abdichtung 62 befindet. (Fig. 9) Aus dieser Darstellung ist ersichtlich, dass sich durch Temperaturwechsel verursachte Längenänderungen durch Zulassen von Bewegungen in Längsrichtung des Plattenstapels bzw. des Gehäuses 11 ausgleichen können. Die beiden doppelten Blockpfeile an der linken Seite in der Fig. 9 sollen das anzeigen. Durch die speziell ausgebildeten Strömungsleitelemente 6 wurde zusätzlich dafür gesorgt, dass die durch Temperaturwechselbelastungen verursachten Spannungen bzw. Formänderungen reduziert werden. Am anderen Ende des Gehäuses 11 ist ein weiterer Flansch 50 ausgebildet worden, an dem der Rohrboden 30 des Plattenstapels und ein weiterer Abgas-Sammelkasten 51 befestigt werden. Ferner sind am Gehäuse 11 Befestigungsmittel 52 ausgeformt, um den Abgaswärmetauscher an einer nicht gezeigten Anschlussstruktur befestigen zu können. Schließlich sind am Gehäuse 11 auch Anschlussstutzen 70 ausgeformt worden, um das Kühlmittel in die Kühlmittelkanäle 5 des Plattenstapels ein - bzw. ausströmen zu lassen. Das Ein - und Ausströmen wird auch durch die im Eintritts- 16 und im Austrittsbereich unverformten Ränder 18 an den Strömungsleitelementen 6 gewährleistet, die in allen Kühlmittelkanälen 5 angeordnet sind.The housing 11 just mentioned is a die-cast aluminum construction used in the Fig. 10 is shown. It has a tapered outlet flange 60 for the exhaust gas, which is dimensioned so that the am Plate stack soldered diffuser 31 fits into it. Further, a groove 61 has been formed, in which a sealing ring or other suitable seal 62 is located. ( Fig. 9 From this representation, it can be seen that changes in length caused by temperature changes can be compensated for by permitting movements in the longitudinal direction of the plate stack or of the housing 11 . The two double block arrows on the left side in the Fig. 9 should show that. Due to the specially designed flow guide 6 was additionally ensured that the stresses caused by thermal cycling stresses or changes in shape are reduced. At the other end of the housing 11 , a further flange 50 has been formed, to which the tube plate 30 of the plate stack and a further exhaust gas collection box 51 are attached. Further, fastening means 52 are formed on the housing 11 in order to fasten the exhaust gas heat exchanger to a connection structure, not shown. Finally, connecting pieces 70 have also been formed on the housing 11 in order to allow the coolant to flow into or out of the coolant channels 5 of the plate stack. The inflow and outflow is also ensured by the edges 18 , which are undeformed in the inlet 16 and in the outlet area, on the flow guide elements 6 , which are arranged in all the coolant channels 5 .

Die Fig. 11 und 12 beziehen sich auf ein Ausführungsbeispiel mit sich in Querrichtung des Abgaswärmetauschers erstreckenden Kanälen 13, die in dem Strömungsleitelement 6 ausgebildet sind. Die Fig. 11 zeigt eine Draufsicht auf ein solches Strömungsleitelement 6. Die schwarzen Blockpfeile zeigen wieder die Richtung des Kühlmittels an. Nur einige der Kanäle 13 weisen Ein - bzw. Austritte 14, 15 innerhalb der gewellten Platte 6 auf. Bei der Mehrzahl der Kanäle 13 sind die Ein - bzw. Austritte an den beiden Längsrändern der gewellten Platte 6 angeordnet worden. Die Fig. 12 zeigt eine Darstellung des gelöteten Abgaswärmetauschers, die äußerliche Ähnlichkeiten mit der Fig. 8 hat. Dort sind allerdings die Strömungsleitelemente 6 aus der Fig. 11 eingesetzt worden. Das um diesen Stapel angeordnete Gehäuse muss entsprechend modifiziert werden. Es wurde für diesen Einsatzfall nicht gezeichnet. Auch dort zeigen die Pfeile die Durchströmungsrichtung des Kühlmittels und des Abgases an. Ein sichtbarer Unterschied zur Fig. 8 besteht darin, dass sich die Abdichtung 40 in Längsrichtung des Abgaswärmetauschers erstreckt. Auch hier sorgt die Abdichtung 40, die an der nicht gezeigten Gehäusewand anliegen soll, dafür, dass die Kühlflüssigkeit auf die Kühlmittelkanäle 5 konzentriert wird.The FIGS. 11 and 12 refer to an embodiment with extending in the transverse direction of the exhaust gas heat exchanger channels 13, which are formed in the flow guide 6 . The Fig. 11 shows a plan view of such a flow guide 6. The black block arrows indicate the direction of the coolant again. Only some of the channels 13 have inlets or outlets 14, 15 within the corrugated plate 6 . In the case of the majority of the channels 13 , the inlets or outlets have been arranged on the two longitudinal edges of the corrugated plate 6 . The Fig. 12 shows a representation of the soldered exhaust gas heat exchanger, the external similarities with the Fig. 8 Has. There are, however, the flow guide 6 from the Fig. 11 been used. The housing arranged around this stack must be modified accordingly. It was not drawn for this application. There, too, the arrows indicate the direction of flow of the coolant and the exhaust gas. A visible difference to Fig. 8 is that the seal 40 extends in the longitudinal direction of the exhaust gas heat exchanger. Again, ensures the seal 40, which is not shown on the Housing wall is intended to ensure that the cooling liquid is concentrated on the coolant channels 5 .

Schließlich zeigt die Fig. 13 einen der Fig. 3 ähnlichen Ausschnitt aus einem Stapel, in dem Flachrohre 2 vorhanden sind, die aus einem Blechstreifen geformt und mittels einer Längsnaht 20 verschweißt sind.Finally, the shows Fig. 13 one of the Fig. 3 similar section of a stack in which flat tubes 2 are present, which are formed from a sheet metal strip and welded by a longitudinal seam 20 .

Claims (11)

  1. Exhaust gas heat exchanger which is composed of a stack which is surrounded by a housing (11), the stack being composed of flat tubes (2) which contain a turbulator (3) through which the exhaust gas flows, a coolant duct (5) which is equipped with flow directing elements (6) being arranged in each case between two flat tubes (2), the flow directing elements (6) being composed of a corrugated plate (7) within which ducts (13) are formed with inlets and outlets (14, 15) which extend in the longitudinal direction or in the transverse direction of the exhaust gas heat exchanger, characterized in that at least some of the ducts (13) have a nonstraight profile in the inlet area (16) of the coolant, and in that the corrugated plate (7) has planar edges (18) in the inlet area (16).
  2. Exhaust gas heat exchanger according to Claim 1 with ducts (13) which extend in the longitudinal direction, characterized in that the inlet area (16) for the coolant is provided in the vicinity of the inlet area (21) for the exhaust gas so that the exhaust gas heat exchanger can have a co-current flow through it.
  3. Exhaust gas heat exchanger according to Claims 1 or 2, characterized in that the corrugated plate (7) is configured at the two longitudinal edges (17) in such a way, at least in the inlet area (20), the coolant is present between the plate stack and housing (11).
  4. Exhaust gas heat exchanger according to Claim 3, characterized in that the longitudinal edges (17) of the corrugated plate (7) are bent over and bear against the adjoining flat tube (2) and are connected, preferably soldered, thereto.
  5. Exhaust gas heat exchanger according to one of the preceding claims, characterized in that the flow of coolant between the housing (11) and the stack is very largely prevented by means of a seal (40).
  6. Exhaust gas heat exchanger according to one of the preceding claims, characterized in that the stack has two side parts (25) which each bound an external coolant duct (5).
  7. Exhaust gas heat exchanger according to one of the preceding claims, characterized in that adjacent to the inlet area (16) the ducts (13) extend essentially linearly in the longitudinal direction of the exhaust gas heat exchanger.
  8. Exhaust gas heat exchanger according to one of the preceding claims, characterized in that the housing (11) is composed of aluminum and is preferably embodied as a die cast part in which the plate stack which is embodied as a stainless steel soldered structure, including the tube plates (30) provided on the flat tube ends and a diffuser (31).
  9. Exhaust gas heat exchanger according to one of the preceding claims, characterized in that the housing (11) has a connecting flange (60) which is matched to the diffuser (31), devices which are composed of a groove (62) and a seal (61) and which permit the changes in length between the stack and the housing being arranged between the diffuser (31) and the connecting flange (60).
  10. Exhaust gas heat exchanger according to one of the preceding claims, characterized in that the flat tubes (2) are composed either of pairs of plates or are manufactured from a strip of sheet metal and welded to a longitudinal seam (20).
  11. Exhaust gas heat exchanger according to Claim 1, with ducts (13) which extend in the transverse direction, characterized in that in the majority of the ducts (13) the inlets (14) and outlets (15) are formed on the longitudinal edges of the corrugated plate.
EP07001251.3A 2006-02-07 2007-01-20 Exhaust gas heat exchanger in an exhaust gas recirculation assembly Active EP1816425B1 (en)

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DE102006005362A1 (en) 2007-08-09
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EP1816425A2 (en) 2007-08-08

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