(19)
(11)EP 3 404 247 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
09.09.2020 Bulletin 2020/37

(21)Application number: 17738584.6

(22)Date of filing:  11.01.2017
(51)International Patent Classification (IPC): 
F02M 26/32(2016.01)
F28D 7/16(2006.01)
F28F 9/22(2006.01)
F28F 9/02(2006.01)
F28D 21/00(2006.01)
F28D 1/053(2006.01)
F28F 1/02(2006.01)
F28F 9/00(2006.01)
F28D 7/00(2006.01)
(86)International application number:
PCT/JP2017/001618
(87)International publication number:
WO 2017/122832 (20.07.2017 Gazette  2017/29)

(54)

EXHAUST GAS HEAT EXCHANGER HAVING STACKED FLAT TUBES

ABGASWÄRMETAUSCHER MIT GESTAPELTEN FLACHROHREN

ÉCHANGEUR DE CHALEUR DE GAZ D'ÉCHAPPEMENT COMPRENANT DES TUBES PLATS EMPILÉS


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 12.01.2016 JP 2016003809

(43)Date of publication of application:
21.11.2018 Bulletin 2018/47

(73)Proprietor: T.RAD Co., Ltd.
Shibuya-ku Tokyo 151-0053 (JP)

(72)Inventors:
  • SUGIMOTO, Hirohito
    Tokyo 151-0053 (JP)
  • YAMAMOTO, Etsuo
    Tokyo 151-0053 (JP)

(74)Representative: Mewburn Ellis LLP 
Aurora Building Counterslip
Bristol BS1 6BX
Bristol BS1 6BX (GB)


(56)References cited: : 
WO-A1-2009/046956
JP-A- 2010 090 785
JP-A- 2014 194 296
JP-A- 2003 090 693
JP-A- 2013 053 620
JP-B2- 4 386 215
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Technical Field



    [0001] The present invention relates to an exhaust gas heat exchanger having stacked flat tubes such as an EGR cooler, in which boiling of cooling water inside a case is suppressed.

    Background Art



    [0002] In order to reduce nitrogen oxide (NOx) contained in exhaust gas exhausted from an engine of a vehicle or the like, or to reduce pumping loss, to mount an EGR (Exhaust Gas Recirculation) device on a vehicle is generally performed. In many cases, in order to lower combustion temperatures in the engine, for this EGR device, an EGR cooler, which is a kind of an exhaust gas heat exchanger and for cooling the exhaust gas, is provided, in a line through which a part of the exhaust gas is recirculated to an intake side of the engine.

    [0003] A general EGR cooler includes a stacked tube body arranged inside a case; the cooler configured such that exhaust gas flows in from one end part of a stacked tube body in a tube axis direction to circulate through the inside of respective flat tubes and flow out from the other end part; and cooling water introduced from a cooling water introduction part provided for the case is supplied to the above-described one end part and circulates through an outer surface side of respective flat tubes.

    [0004] In the EGR cooler configured as described above, exhaust gas having flowed in from one end part of the stacked tube body in the tube axis direction is cooled, while circulating through the inside of respective tubes and flowing out from the other end part, with cooling water circulating in the same direction as the exhaust gas through the outer surface side of the tube. The exhaust gas in the EGR cooler has the highest temperature at a part at which the exhaust gas flows into the stacked tube body (one end part of the above-described stacked tube body in the tube axis direction), and the temperature gradually falls due to heat exchange with the cooling water while the exhaust gas circulates through the inside of respective tubes to become the lowest at the part where it flows out from the stacked tube body (the other end part of the above-described stacked tube body in the tube axis direction).

    [0005] However, usually, a cooling water introduction part is provided at a corner part on one side of a case, and cooling water that flows in from the introduction part and flows through a gap between respective tubes causes easily drift in which the cooling water flows disproportionately to a part with low flow resistance rather than a part with high flow resistance and tends not to be distributed evenly to a cooling water inflow part of respective tubes. In general, presence of difference in distances from a cooling water introduction part provided at a corner part on one side of a case to each positon of cooling water inflow parts of a stacked tube body is a main factor of the difference in flow resistances. Then, when viewed from the entire stacked tube body, temperature in a part of a stacked tube body near the inflow part of exhaust gas is made high, and cooling water in a part in which a flow quantity is reduced due to drift easily generates in particular local boiling.

    [0006] In order to suppress such local boiling of cooling water, installation of a cooling water supply chamber, which has an effect of causing cooling water distribution to a stacked tube body to be uniform, is proposed. For example, in Patent Literature 1, a device is disclosed, in which an annular cooling water supply chamber is externally mounted on one end part of a peripheral wall of a case and an inlet tube is connected to the cooling water supply chamber, and, in addition, an annular slit hole interconnecting the inside of the cooling water supply chamber and the inside of the case is oriented toward a case part inside the cooling water supply chamber.

    [0007] Moreover, in Patent Literature 2, installation of a cooling water supply chamber having a shape different from that in the Patent Literature 1 is disclosed. In the cooling water supply chamber in Patent Literature 2, the tip part thereof is connected to a cooling water inlet tube, and the end part is interconnected to a case housing a stacked tube body. Width of the cooling water supply chamber is gradually expanded from the cooling water inlet tube side toward the case side, and the expanded end part coincides with a case width of a part housing the stacked tube body. Consequently, it is so configured that cooling water can be supplied uniformly over the entire case width.

    [0008] JP2010090785A discloses an EGR device where cooling liquid is introduced from both an engine cooling circuit and an inverter cooling circuit. The temperature of cooling liquid introduced from the inverter cooling circuit is lower than that of cooling liquid introduced from the engine cooling circuit. As a result, temperature of the cooling liquid near an EGR gas inlet may be reduced, and boiling of the cooling liquid may be prevented.

    Citation List


    Patent Literature



    [0009] 

    PTL 1: Japanese Patent Application Laid-Open Publication No. 2005-69064

    PTL 2: Japanese Patent Application Laid-Open Publication No. 2007-154683


    Summary of Invention


    Technical Problem



    [0010] As a consequence of installation of such a cooling water supply chamber system, an effect of suppressing boiling of cooling water in the inside of a case of an EGR cooler can be sufficiently expected. However, due to the installation of the cooling water supply chamber system outside the case of an EGR cooler, new problems are generated such that the entire configuration of the EGR cooler becomes complex in accordance with the installation and, in addition, a loading volume of a vehicle, whose space is strictly restricted, is increased to also increase the cost.

    Solution to Problem



    [0011] The present invention is configured as follows, in order to solve the above-described problems. According to a first aspect of the invention, there is provided an exhaust gas heat exchanger as set out in claim 1.

    [0012] The exhaust gas heat exchanger may be as described in the dependent claims.

    Advantageous Effects of Invention



    [0013] In a first embodiment the cooling water introduction part is provided for a case in two locations, introduction directions of cooling water from respective cooling water introduction parts into the inside of the case are opposite to each other and, in addition, each introduction direction is parallel to a flat surface of the flat tube in the stacked tube body and is perpendicular in the axis direction of the flat tube.

    [0014] As a consequence of the configuration as described above, the cooling water is introduced in opposition from both directions (horizontal directions) parallel to the flat surface of the flat tube in the stacked tube body and perpendicular in the axis direction of the stacked tube body that is coaxial with the circulation direction of exhaust gas and, therefore, the cooling water is uniformly distributed (divided in flow amount) over the entire one end part in the stacked tube body, without drift toward one side of the right and left of the stacked tube body. As a result, local boiling of the cooling water can effectively be suppressed. Moreover, since installation of a cooling water supply chamber system outside the case is unnecessary unlike the conventional structure, problems such as complication of entire configuration, increase in a loading capacity and/or increase in cost are not generated.

    [0015] In the second embodiment the configuration is such that a baffle plate having a cutout part is provided for each of the two cooling water introduction parts and introduced cooling water passes through these cutout parts and distributed to one end part of the stacked tube body in the tube axis direction.

    [0016] As a consequence of the configuration as described above, by setting the shape and/or position of the cutout part of the baffle plate as intended, the optimum distribution of the cooling water in accordance with characteristics and/or structure of an exhaust gas heat exchanger can be set. As a result, the optimum setting, by which drift tending to occur in the cooling water flow from the cutout part toward the stacked tube body side is suppressed as far as possible and even and sufficient amount of cooling water can be supplied to the one end part in the stacked tube body, becomes possible to thereby suppress a local boiling phenomenon.

    [0017] The third embodiment is configured such that respective distribution main portions (respective parts with a large distribution percentage) of the cooling water with respect to the two baffle plates flow toward mutually different spaces between layers of the stacked tube body.

    [0018] As a consequence of the configuration as described above, the cooling water that flow out so as to be opposite mutually from cutout parts of the two baffle plates do not interfere with each other at the center part of one end part of the stacked tube body in the axis direction to prevent a phenomenon of reduction of cooling water flow rate that would be generated due to the interference. As a result, local boiling of the cooling water due to flow rate reduction is also avoided.

    [0019] The fourth embodiment of the present invention is configured such that the two baffle plates are structured integrally with a linking plate. As a consequence of the configuration as described above, positioning and provisional fixing of the baffle plate become unnecessary in assembling an exhaust gas heat exchanger, and simple and highly accurate installation of the baffle plate becomes possible.

    [0020] The fifth embodiment of the present invention is configured such that at least one of the two baffle plates has a receiving surface for receiving cooling water introduced into the cooling water introduction part, and a guide surface for guiding the cooling water from the receiving surface to the cutout part. As a consequence of the configuration as described above, cooling water introduced from the cooling water introduction part is received with the receiving surface and, via the guide surface smoothly, guided surely to the cutout part, and distributed to one end part (upstream side of exhaust gas) of the stacked tube body in the axis direction.

    [0021] The sixth embodiment of the present invention is configured such that a folding erection part is provided for the end part on the side opposite to the guide surface in the receiving surface and, with the folding erection part, the cooling water is prevented from flying in all directions from the receiving surface and flowing out inside the case. As a consequence of the configuration as described above, outflow of a part of the cooling water, which is introduced from the cooling water introduction part, from the baffle plate into the inside of the case without passing through the cutout part is suppressed, and all the cooling water having flowed in is surely guided to the cutout part, which is distributed from there to the one end part of the stacked tube body in the axis direction.

    Brief Description of Drawings



    [0022] 

    Fig. 1 illustrates a partial perspective view showing the inside of one end part of a stacked tube body in an axis direction in an EGR cooler that is a type of an exhaust gas heat exchanger of the present invention.

    Fig. 2 illustrates a partial perspective view of a disassembled one end part of the stacked tube body in the axis direction shown in Fig. 1.

    Fig. 3 illustrates an appearance plan view showing the entire EGR cooler in Fig. 1.

    Fig. 4 illustrates an appearance side view showing the entire EGR cooler in Fig. 1.

    Fig. 5 illustrates a cross-sectional plan view showing the inside in Fig. 3.

    Fig. 6 illustrates a VI-VI arrow view of Fig. 5.

    Fig. 7 illustrates a VII-VII arrow view of Fig. 5.


    Description of Embodiments



    [0023] Fig. 1 illustrates a partial perspective view showing the inside of one end part of a stacked tube body in an axis direction in an EGR cooler that is a type of an exhaust gas heat exchanger of the present invention, and Fig. 2 illustrates a partial perspective view of a disassembled one end part of the stacked tube body in the axis direction shown in Fig. 1. In these drawings, an EGR cooler 1 includes a long and thin case 2 having an approximately square cross-section, and a long and thin stacked tube body 3 having an approximately square cross-section housed inside the case 2.

    [0024] The stacked tube body 3 is configured by stacking a plurality of flat tubes 4 in multiple tiers with spaces therebetween. Each of flat tubes 4 is stacked in multiple tiers with a predetermined space each other in the vertical direction in Fig. 1, and each of upper and lower surfaces of each flat tube 4 configures a flat surface 4a.

    [0025] Exhaust gas A at a high temperature is supplied into the case 2 in the axis direction from the arrow direction and flows into the stacked tube body 3 in the axis direction. Specifically, the exhaust gas A flows in from one end part of the long and thin stacked tube body 3 in the axis direction, circulates through the inside of each flat tube 4 in the axis direction and flows out from the other end part. It is configured such that, to the case 2 at one end part of the stacked tube body 3 in the axis direction, that is, at one end part lying on a side where the exhaust gas A at high temperature flows in, cooling water B introduced from two cooling water introduction parts 5 and 6 is distributed.

    [0026] The cooling water introduction part 5 is provided for a right sidewall of the case 2 in Fig. 1, and the cooling water introduction part 6 is provided for a left sidewall of the case 2 in Fig. 1. Introduction directions of the cooling water introduced from each of the cooling water introduction parts 5 and 6 are directions opposite to each other and, moreover, each of the introduction directions is parallel to the flat surface 4a of the flat tube 4 in the stacked tube body 3 and perpendicular in the axis direction of the flat tube 4. In Fig. 1, cooling water is introduced horizontally from the cooling water introduction part 5 on the right side in the left direction in Fig. 1, and cooling water is introduced horizontally from the cooling water introduction part 6 on the left side in the right direction in Fig. 1. Then, cooling water distributed to one end of the long and thin stacked tube body 3 in the axis direction circulates in the axis direction along the outer surface side of each flat tube 4 and flows out from the other end part.

    [0027] For each of the cooling water introduction parts 5 and 6 in this embodiment, baffle plates 7 having cutout parts 8 are provided. As shown in Fig. 2, two baffle plates 7 are formed in a plate shape and, in the inside thereof, a plurality of cutout parts 8 (detailed action thereof will be described later) are formed. Further, the cooling water introduction parts 5 and 6 are linked integrally with a linking plate 9 so that the plate surfaces of the cooling water introduction parts 5 and 6 face each other, and an opening part 10 that allows the exhaust gas A to pass through is provided in the linking plate 9. Incidentally, two baffle plates 7 linked integrally with the linking plate 9 are joined integrally with the case 2 by brazing or the like.

    [0028] As shown in Fig. 2, in the baffle plate 7, a receiving surface 11 that receives cooling water introduced to the cooling water introduction parts 5 and 6 and a guide surface 12 that guides the cooling water received with the receiving surface 11 to the cutout part 8 are formed. The receiving surface 11 is formed of a surface perpendicular in the introduction direction of cooling water, and the guide surface 12 is formed of a moderately inclined surface inclining from the receiving surface 11 in an obtuse angle direction. On the end part on the side opposite to the guide surface 12 in the receiving surface 11, a folding erection part 13 whose linear long and thin tip edge is in close contact with the inner surface of the case 2 is provided, and, with the folding erection part 13, cooling water is prevented from flying in all directions from the receiving surface 11 and flowing out into the inside of the case 2. Incidentally, the folding erection part 13 is formed by folding an end part of the receiving surface 11.

    [0029] On the other hand, as shown in Fig. 2, in a part overlapping the cooling water introduction parts 5 and 6 in the case 2 facing the baffle plate 7, an evagination part 14 that evaginates outward is formed, and cooling water is introduced perpendicularly to the evagination part 14 and collides perpendicularly with the surface of the receiving surface 11 formed in the baffle plate 7. The cooling water is guided smoothly to the cutout part 8 from the receiving surface 11 along the guide surface 12, and distributed to one end part of the long and thin stacked tube body 3 in the axis direction through the cutout part 8.

    [0030] In Fig. 1 and Fig. 2 one end part alone of the stacked tube body in the axis direction in an EGR cooler is shown, in Fig. 3 an appearance plan view showing the whole of the EGR cooler is shown, and in Fig. 4 an appearance side view thereof is shown. Moreover, in Fig. 5 a plan cross-sectional view showing the inside of Fig. 3 is shown.

    [0031] In Figs. 3 to 5, a supply part 15 for the exhaust gas A is provided for one end part in the axis direction of the case 2 provided in the EGR cooler 1, and a discharge part 16 for the exhaust gas A having circulated through the stacked tube body 3 is provided for the other end part. Near the supply part 15 for the exhaust gas A, cooling water supply parts 5 and 6 are provided while facing each other in horizontal directions in Figs. 3 and 5, and, near the discharge part 16 for the exhaust gas A, a discharge part 17 for a cooling water having passed along the outer periphery of the stacked tube body 3 is provided.

    [0032] In Fig. 5, in order to show the inside of the case 2, the case 2 is shown with a dashed one-dotted line. In Fig. 5, the surface of the flat surface 4a of the flat tube 4 configuring the stacked tube body 3 is shown. On each of one end part and the other end part of each of flat tubes 4 having been stacked, a long and thin linear ribs 4b are formed in the vertical direction in Fig. 5 (corresponding to the horizontal direction in Fig. 1). These ribs 4b have been conventionally adopted, however, in particular the rib 4b, which is formed on the surface of the flat surface 4a of one end part into which the exhaust gas A flows, distributes cooling water having been distributed to one tip part to the surface of the flat surface 4a as an arrow and enhances the flow rate in the part to thereby reduce local boiling. Incidentally, projection height of the rib 4b is set to be lower than flow path height, and a part of the cooling water flows over the rib 4b. A situation of distribution of the cooling water due to the rib 4b is also shown with an arrow in Fig. 1.

    [0033] Fig. 6 illustrates a VI-VI arrow view of Fig. 5, and Fig. 7 illustrates a VII-VII arrow view of Fig. 5. With respect to the cutout part 8 in the baffle plate 7 shown in Fig. 6, a cutout part 8 having a comb-teeth-like shape and a comparatively large opening area is formed on the upper side in Fig. 6 and a cutout part 8 having an oval shape and a small opening area is formed on the lower side. The cutout part 8 having a large opening area is mainly for distribution, and a greater part of cooling water passes through the cutout part 8 on the upper side having a little flow resistance and is distributed to the stacked tube body 3. On the other hand, the cutout part 8 having a small opening area is mainly for applying a brazing material to the stacked tube body 3, and has large flow resistance. Therefore, only a small amount of cooling water flows through the cutout part 8 on the lower side. In other words, the baffle plate 7 in Fig. 6 is set so that a greater amount of cooling water is distributed to a flat tube 4 group on the upper side than to a flat tube 4 group on the lower side in the stacked tube body 3 in Fig. 6 and, therefore, the distribution main portions thereof lie on the upper side in spaces between tube layers.

    [0034] Furthermore, with respect to the cutout part 8 in the baffle plate 7 shown in Fig. 7, a cutout part 8 having a comb-teeth-like shape and a comparatively large opening area is formed on the lower side in the drawing, and a cutout part 8 having an oval shape and a small opening area is formed on the upper side. That is, the baffle plate 7 in Fig. 7 is set so that a greater amount of cooling water is distributed to a flat tube 4 group on the lower side than to a flat tube 4 group on the upper side in the stacked tube body 3 in Fig. 7 and, therefore, the distribution main portions thereof lie on the lower side in spaces between tube layers.

    [0035] In this way, as a consequence of configuration such that the distribution main portions of each cooling water flow toward spaces between mutually different layers of the stacked tube body, as described above, each cooling water that flows out from the cutout part 8 of two baffle plates 7 so as to face mutually does not interfere mutually at the center part of one end part of the stacked tube body 3 in the axis direction, and, as described above, a phenomenon of flow rate reduction of the cooling water that might occur due to the interference can be warded off to prevent local boiling of the cooling water due to flow rate reduction, as a result.

    Industrial Applicability



    [0036] The exhaust gas heat exchanger of the present invention is utilized as a cooler in a discharge gas recirculation system or a heat exchanger for recover heat of exhaust gas, in a diesel engine or a gasoline engine.

    Reference Signs List



    [0037] 
    1:
    EGR cooler
    2:
    case
    3:
    stacked tube body
    4:
    flat tube
    4a:
    flat surface
    4b:
    rib
    5, 6:
    cooling water introduction part
    7:
    baffle plate
    8:
    cutout part
    9:
    linking plate
    10:
    opening part
    11:
    receiving surface
    12:
    guide surface
    13:
    folding erection part
    14:
    evagination part
    15:
    supply part
    16, 17:
    discharge part
    A:
    exhaust gas
    B:
    cooling water



    Claims

    1. An exhaust gas heat exchanger having stacked flat tubes comprising:
    a stacked tube body (3) configured by stacking a plurality of flat tubes (4) in multiple tiers with spaces therebetween and arranged inside a case (2); the exchanger configured such that:

    exhaust gas flows in from one end part of the stacked tube body (3) in a tube axis direction, circulates through an inside of each flat tube (4), and flows out from the other end part of the stacked tube body (3) in the tube axis direction; and

    cooling water introduced from cooling water introduction parts provided for the case (2) is supplied to the one end part to circulate along an exterior surface side of each flat tube (4), wherein:

    the cooling water introduction parts (5, 6) are provided in two locations for the case (2) and introduction directions of the cooling water from each of the cooling water introduction parts (5, 6) into the inside of the case (2) are set in mutually opposite directions;

    each of the introduction directions is parallel to a flat surface (4a) of the flat tube (4) in the stacked tube body (3) and perpendicular to the axis direction of the flat tube (4);

    each of the two cooling water introduction parts (5, 6) is provided with a baffle plate (7) having cutout parts (8);

    the exchanger is configured such that the introduced cooling water passes through these cutout parts (8) and is distributed to the one end part of the stacked tube body (3) in the tube axis direction; characterised in that

    the two baffle plates (7) are configured such that respective distribution main portions of the cooling water flow toward spaces between mutually different layers of the stacked tube body (3), so that each cooling water that flows out from the cutout parts (8) of the two baffle plates (7) so as to face mutually do not interfere mutually at a centre part of one end part of the stacked tube body (3) in the tube axis direction.


     
    2. The exhaust gas heat exchanger having stacked flat tubes according to claim 1, wherein
    the two baffle plates (7) are structured integrally with a linking plate (9) having an opening part (10) that allows exhaust gas to circulate.
     
    3. The exhaust gas heat exchanger having stacked flat tubes according to claim 2, wherein
    at least one of the two baffle plates (7) has a receiving surface (11) for receiving the cooling water introduced into the cooling water introduction parts (5, 6), and a guide surface (12) for guiding the cooling water from the receiving surface (11) to the cutout parts (8).
     
    4. The exhaust gas heat exchanger having stacked flat tubes according to claim 3, wherein
    a folding erection part (13) is provided for an end part of the receiving surface (11) lying on the opposite side of the guide surface (12); and
    the exchanger is configured such that the folding erection part (13) prevents the cooling water from flying in all directions from the receiving surface (11) and flowing out into the inside of the case (2).
     


    Ansprüche

    1. Abgaswärmetauscher mit gestapelten Flachrohren, der Folgendes umfasst:

    einen gestapelten Rohrkörper (3), der durch das Stapeln einer Vielzahl von Flachrohren (4) in mehrere Schichten mit Leerräumen dazwischen ausgelegt ist und innerhalb eines Gehäuses (2) angeordnet ist; wobei der Wärmetauscher derart ausgelegt ist, dass

    Abgas von einem Endabschnitt des gestapelten Rohrkörpers (3) in eine Rohrachsenrichtung einströmt, durch ein Inneres jedes Flachrohrs (4) zirkuliert und vom anderen Endabschnitt des gestapelten Rohrkörpers (3) in Rohrachsenrichtung ausströmt; und

    Kühlwasser, das von für das Gehäuse (2) bereitgestellten Kühlwasserzufuhrabschnitten zugeführt wird, an dem einen Endabschnitt zugeführt wird, um entlang einer Außenflächenseite jedes Flachrohrs (4) zu zirkulieren, wobei:

    die Kühlwasserzufuhrabschnitte (5, 6) an zwei Positionen für das Gehäuse (2) bereitgestellt sind und Zufuhrrichtungen des Kühlwassers von jedem der Kühlwasserzufuhrabschnitte (5, 6) in das Innere des Gehäuses (2) in jeweils entgegengesetzte Richtungen eingestellt sind;

    jede der Zufuhrrichtungen parallel zu einer flachen Oberfläche (4a) des Flachrohrs (4) in dem gestapelten Rohrkörper (3) und normal zu der Achsenrichtung des Flachrohrs (4) ist;

    jeder der zwei Kühlwasserzufuhrabschnitte (5, 6) mit einer Prallplatte (7) mit Aussparungsabschnitten (8) bereitgestellt ist;

    der Tauscher derart ausgelegt ist, dass das zugeführte Kühlwasser durch diese Aussparungsabschnitte (8) hindurchtritt und zu dem einen Endabschnitt des gestapelten Rohrkörpers (3) in der Rohrachsenrichtung verteilt wird; dadurch gekennzeichnet, dass

    die zwei Prallplatten (7) derart ausgelegt sind, dass die jeweiligen Verteilungshauptanteile des Kühlwassers in Richtung von Leerräumen zwischen jeweils unterschiedlichen Schichten des gestapelten Rohrkörpers (3) strömen, sodass alle Kühlwasserströme, die aus den Aussparungsabschnitten (8) der zwei Prallplatten (7) hinausströmen, um einander zugewandt zu sein, sich nicht in einem Mittelabschnitt eines Endabschnitts des gestapelten Rohrkörpers (3) in Rohrachsenrichtung gegenseitig beeinflussen.


     
    2. Abgaswärmetauscher mit gestapelten Flachrohren nach Anspruch 1, wobei die zwei Prallplatten (7) einstückig mit einer Verbindungsplatte (9) mit einem Öffnungsabschnitt (10), der die Zirkulation des Abgases ermöglicht, gebildet sind.
     
    3. Abgaswärmetauscher mit gestapelten Flachrohren nach Anspruch 2, wobei zumindest eine der zwei Prallplatten (7) eine Aufnahmefläche (11) zum Aufnehmen des Kühlwassers, das zu den Kühlwasserzufuhrabschnitten (5, 6) zugeführt wird, und eine Leitfläche (12) zum Leiten des Kühlwassers von der Aufnahmefläche (11) zu den Aussparungsabschnitten (8) umfasst.
     
    4. Abgaswärmetauscher mit gestapelten Flachrohren nach Anspruch 3, wobei
    ein Faltmontageabschnitt (13) für einen Endabschnitt der Aufnahmefläche (11), der auf der gegenüberliegenden Seite der Leitfläche (12) liegt, bereitgestellt ist; und
    der Tauscher derart ausgelegt ist, dass der Faltmontageabschnitt (13) das Kühlwasser daran hindert, von der Aufnahmefläche (11) in alle Richtungen zu fliegen und in das Innere des Gehäuses (2) auszuströmen.
     


    Revendications

    1. Echangeur de chaleur de gaz d'échappement ayant des tubes plats empilés comprenant :

    un corps de tube empilé (3) configuré en empilant une pluralité de tubes plats (4) sur plusieurs rangées avec des espaces entre eux et agencés à l'intérieur d'un boitier (2) ; l'échangeur étant configuré de sorte que :

    le gaz d'échappement s'écoule à partir d'une partie d'extrémité du corps de tube empilé (3) dans une direction d'axe de tube, circule à travers un intérieur de chaque tube plat (4) et sort par l'autre partie d'extrémité du corps de tube empilé (3) dans la direction d'axe de tube ; et

    l'eau de refroidissement introduite à partir des parties d'introduction d'eau de refroidissement prévues pour le boîtier (2) est fournie à la une partie d'extrémité afin de circuler le long d'un côté de la surface extérieure de chaque tube plat (4), dans lequel :

    les parties d'introduction d'eau de refroidissement (5, 6) sont prévues dans deux emplacements pour le boîtier (2) et les directions d'introduction de l'eau de refroidissement à partir de chacune des parties d'introduction d'eau de refroidissement (5, 6) dans l'intérieur du boîtier (2) sont déterminées dans des directions mutuellement opposées ;

    chacune des directions d'introduction est parallèle à une surface plate (4a) du tube plat (4) dans le corps de tube empilé (3) et perpendiculaire à la direction d'axe du tube plat (4) ;

    chacune des deux parties d'introduction d'eau de refroidissement (5, 6) est prévue avec une plaque de déflecteur (7) ayant des parties découpées (8) ;

    l'échangeur est configuré de sorte que l'eau de refroidissement introduite passe par ces parties découpées (8) et est distribuée à la une partie d'extrémité du corps de tube empilé (3) dans la direction d'axe de tube ; caractérisé en ce que :
    les deux plaques de déflecteur (7) sont configurées de sorte que les parties principales de distribution respectives de l'écoulement d'eau de refroidissement vers des espaces entre des couches mutuellement différentes du corps de tube empilé (3), de sorte que chaque eau de refroidissement qui sort par les parties découpées (8) des deux plaques de déflecteur (7) afin de se faire mutuellement face, n'interfèrent pas mutuellement au niveau d'une partie centrale de la une partie d'extrémité du corps de tube empilé (3) dans la direction d'axe de tube.


     
    2. Echangeur de chaleur de gaz d'échappement ayant des tubes plats empilés selon la revendication 1, dans lequel :
    les deux plaques de déflecteur (7) sont structurées de manière solidaire avec une plaque de liaison (9) ayant une partie d'ouverture (10) qui permet la circulation du gaz d'échappement.
     
    3. Echangeur de chaleur de gaz d'échappement ayant des tubes plats empilés selon la revendication 2, dans lequel :
    au moins l'une des deux plaques de déflecteur (7) a une surface de réception (11) pour recevoir l'eau de refroidissement introduite dans les parties d'introduction d'eau de refroidissement (5, 6) et une surface de guidage (12) pour guider l'eau de refroidissement de la surface de réception (11) aux parties découpées (8).
     
    4. Echangeur de chaleur de gaz d'échappement ayant des tubes plats empilés selon la revendication 3, dans lequel :

    une partie d'installation pliante (13) est prévue pour une partie d'extrémité de la surface de réception (11) se trouvant sur le côté opposé de la surface de guidage (12) ; et

    l'échangeur est configuré de sorte que la partie d'installation pliante (13) empêche l'eau de refroidissement de s'envoler dans toutes les directions à partir de la surface de réception (11) et de sortir dans l'intérieur du boîtier (2).


     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description