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EP1816425B1 - Échangeur thermique de gaz d'échappement dans un agencement de recyclage des gaz d'échappement - Google Patents

Échangeur thermique de gaz d'échappement dans un agencement de recyclage des gaz d'échappement 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)
English (en)
Other versions
EP1816425A3 (fr
EP1816425A2 (fr
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
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 Modine Manufacturing Co filed Critical Modine Manufacturing Co
Publication of EP1816425A2 publication Critical patent/EP1816425A2/fr
Publication of EP1816425A3 publication Critical patent/EP1816425A3/fr
Application granted granted Critical
Publication of EP1816425B1 publication Critical patent/EP1816425B1/fr
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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 .

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

Claims (11)

  1. Échangeur thermique à gaz d'échappement, constitué d'une pile entourée par un boîtier (11) ; la pile se composant de tubes plats (2) qui contiennent un turbulateur (3) à travers lequel s'écoule le gaz d'échappement, un canal de réfrigérant (5) étant disposé entre deux tubes plats (2), lequel est muni d'éléments de guidage de l'écoulement (6), les éléments de guidage de l'écoulement (6) se composant d'une plaque ondulée (7) à l'intérieur de laquelle sont réalisés des canaux (13) avec des entrées et des sorties (14, 15), qui s'étendent dans la direction longitudinale ou dans la direction transversale de l'échangeur thermique à gaz d'échappement,
    caractérisé en ce
    qu'au moins certains des canaux (13) dans une région d'entrée (16) du réfrigérant présentent une allure non droite
    et en ce que la plaque ondulée (7) dans la région d'entrée (16) présente des bords plans (18).
  2. Échangeur thermique à gaz d'échappement selon la revendication 1, comprenant des canaux (13) s'étendant dans la direction longitudinale, caractérisé en ce que la région d'entrée (16) du réfrigérant est prévue à proximité de la région d'entrée (21) du gaz d'échappement de sorte que l'échangeur thermique à gaz d'échappement puisse être parcouru à co-courant.
  3. Échangeur thermique à gaz d'échappement selon les revendications 1 ou 2, caractérisé en ce que la plaque ondulée (7) est configurée au niveau des deux bords longitudinaux (17) de telle sorte qu'au moins dans la région d'entrée (20), le réfrigérant soit présent entre la pile de plaques et le boîtier (11).
  4. Échangeur thermique à gaz d'échappement selon la revendication 3, caractérisé en ce que les bords longitudinaux (17) de la plaque ondulée (7) sont recourbés et s'appliquent contre le tube plat adjacent (2) et sont connectés à celui-ci, de préférence par brasage.
  5. Échangeur thermique à gaz d'échappement selon l'une quelconque des revendications précédentes, caractérisé en ce que l'écoulement du réfrigérant entre le boîtier (11) et la pile est essentiellement supprimé au moyen d'une garniture d'étanchéité (40).
  6. Échangeur thermique à gaz d'échappement selon l'une quelconque des revendications précédentes, caractérisé en ce que la pile présente deux parties latérales (25) qui délimitent chacune un canal de réfrigérant (5) situé à l'extérieur.
  7. Échangeur thermique à gaz d'échappement selon l'une quelconque des revendications précédentes, caractérisé en ce que les canaux (13) s'étendent à la suite de la région d'entrée (16) essentiellement en ligne droite dans la direction longitudinale de l'échangeur thermique à gaz d'échappement.
  8. Échangeur thermique à gaz d'échappement selon l'une quelconque des revendications précédentes, caractérisé en ce que le boîtier (11) se compose d'aluminium et est réalisé de préférence sous forme de pièce coulée sous pression, dans laquelle peuvent être insérés la pile de plaques réalisée sous forme de construction brasée en acier spécial, avec les plaques à tube (30) prévues aux extrémités des tubes plats et un diffuseur (31).
  9. Échangeur thermique à gaz d'échappement selon l'une quelconque des revendications précédentes, caractérisé en ce que le boîtier (11) présente une bride de raccordement (60) adaptée au diffuseur (31), des systèmes étant prévus entre le diffuseur (31) et la bride de raccordement (60), lesquels se composent d'une rainure (62) et d'une garniture d'étanchéité (61) qui permettent des variations de longueur entre la pile et le boîtier.
  10. Échangeur thermique à gaz d'échappement selon l'une quelconque des revendications précédentes, caractérisé en ce que les tubes plats (2), se composent soit de paires de plaques, soit sont fabriqués à partir d'une bande de tôle et sont soudés avec un cordon longitudinal (20).
  11. Échangeur thermique à gaz d'échappement selon la revendication 1, comprenant des canaux (13) s'étendant dans la direction transversale, caractérisé en ce que dans le cas de la pluralité de canaux (13), les entrées et les sorties (14, 15) sont réalisées au niveau des bords longitudinaux de la plaque ondulée.
EP07001251.3A 2006-02-07 2007-01-20 Échangeur thermique de gaz d'échappement dans un agencement de recyclage des gaz d'échappement Active EP1816425B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006005362A DE102006005362A1 (de) 2006-02-07 2006-02-07 Abgaswärmetauscher in einer Abgasrückführungsanordnung

Publications (3)

Publication Number Publication Date
EP1816425A2 EP1816425A2 (fr) 2007-08-08
EP1816425A3 EP1816425A3 (fr) 2012-06-27
EP1816425B1 true EP1816425B1 (fr) 2014-10-01

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Country Link
US (1) US8020610B2 (fr)
EP (1) EP1816425B1 (fr)
DE (1) DE102006005362A1 (fr)

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EP1816425A3 (fr) 2012-06-27
DE102006005362A1 (de) 2007-08-09
US20070181294A1 (en) 2007-08-09
EP1816425A2 (fr) 2007-08-08
US8020610B2 (en) 2011-09-20

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