EP2998684B1 - Device for feeding a coolant to a heat exchanger, preferably for an exhaust gas cooler of a combustion engine of a motor vehicle - Google Patents

Device for feeding a coolant to a heat exchanger, preferably for an exhaust gas cooler of a combustion engine of a motor vehicle Download PDF

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Publication number
EP2998684B1
EP2998684B1 EP15184620.1A EP15184620A EP2998684B1 EP 2998684 B1 EP2998684 B1 EP 2998684B1 EP 15184620 A EP15184620 A EP 15184620A EP 2998684 B1 EP2998684 B1 EP 2998684B1
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EP
European Patent Office
Prior art keywords
coolant
flow
heat exchanger
connecting stub
directing device
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EP15184620.1A
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German (de)
French (fr)
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EP2998684A1 (en
Inventor
Jens Holdenried
Cecilia Marola
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Mahle International GmbH
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Mahle International GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/0205—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • 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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • F28F9/0256—Arrangements for coupling connectors with flow lines
    • F28F9/0258—Arrangements for coupling connectors with flow lines of quick acting type, e.g. with snap action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/024—Exhaust treating devices having provisions not otherwise provided for for cooling the device using a liquid

Definitions

  • the invention relates to a device for supplying a coolant to a heat exchanger, preferably for an exhaust gas cooler of an internal combustion engine of a motor vehicle, comprising a connecting piece.
  • Exhaust coolers as used in motor vehicles, have the task of cooling hot exhaust gas from internal combustion engines, so that this cooled exhaust gas can be mixed back into the intake air. So that the thermodynamic efficiency of the internal combustion engine does not sink too much, a cooling to a low level is desirable.
  • This principle is commonly known as cooled exhaust gas recirculation and is used to achieve a reduction of pollutants in the exhaust gas.
  • the coolant Due to very high exhaust gas temperatures of the internal combustion engine, the coolant, especially in the area directly behind the gas inlet of the Exhaust gas cooler come to a boil, which can have a negative impact on the life of the exhaust gas cooler. The boiling risk can be counteracted to a limited extent by increasing the coolant throughput. Technically, however, the amount of coolant flowing through the exhaust gas cooler is limited by the coolant-side flow resistance of the exhaust gas cooler.
  • a device according to the preamble of claim 1 is known with a system of a valve and a protective cap, in which the valve is connected at one end to a line of a closed fluid circuit.
  • a sealing body is arranged between the valve and the protective cap in order to prevent the penetration of dirt particles into the coolant.
  • the DE 10 2012 221 325 A1 discloses a winding head cooling, wherein two cooling circuit components, which cool an electric machine, are connected by means of a so-called plug and seal element.
  • DE 1815047 discloses a device for separating gas bubbles from the coolant flow of a liquid-cooled nuclear reactor with a flow guide for the coolant.
  • An embodiment of the invention relates to a device for supplying a coolant in a heat exchanger, preferably in an exhaust gas cooler of an internal combustion engine of a motor vehicle and a Connecting piece, wherein in the interior of the connecting piece a projection-like designed Strömungsleit adopted for the coolant is integrated.
  • the connecting piece is advantageously designed as a so-called plug and seal element for use in a coolant connection.
  • the flow-guiding device is formed approximately centrally on the inner wall, protruding into an inner space of the connecting piece, with a contour of the flow-guiding device rising in the longitudinal direction of the connecting piece in the direction of the heat exchanger.
  • a ski-shaped flow guiding device which terminates on both sides with the connecting piece, generates a diversified coolant guide in the direction of the heat exchanger as well as to the sides within the connecting piece.
  • the acceleration of the flow is approximately constant and takes place approximately over the entire length of the connecting piece.
  • an axial rise of the contour of the flow guide in the direction of the heat exchanger is linear.
  • Such a linear increase of the integrated in the connecting piece flow guide allows constructive connection of a line that can be branched in several directions.
  • the axial rise of the contour of the flow guide in the direction of the heat exchanger according to a power function.
  • Such a course promotes the constant acceleration of the flow of the coolant and thus reduces the risk of boiling the coolant.
  • the axial rise of the contour of the flow guide parabolic.
  • the contour of the flow guide in the radial direction of the connecting piece is formed approximately mirror-symmetrical, on both sides to a centrally formed maximum is followed by a curvature to the inner wall of the connecting piece.
  • the respective curvature runs from the maximum of the flow concave concave to the inner wall of the connecting piece.
  • a connecting piece in a coolant connection allows a particularly space-efficient and optimized connection to the exhaust gas cooler without additional hoses or pipes directly to the internal combustion engine.
  • the radial alignment of the contour of the flow-guiding device is dependent on a width of the Fluid circuit containing block determined.
  • connection piece has an approximately round cross-section and is arranged directly on the heat exchanger.
  • FIG. 1 shows an inlet region for exhaust gas and coolant of an exhaust gas cooler 1, as used in internal combustion engines, preferably diesel engines, in motor vehicles to cool the hot exhaust gas emitted from the internal combustion engine, so that this cooled exhaust gas can be added to the intake air of the internal combustion engine again.
  • an exhaust gas cooler 1 consists of a diffuser 2, to which a radiator block 3 is connected.
  • a coolant port 5 is fixed, through which a coolant is introduced into the radiator block 3 to the tubes 4, through which the hot exhaust gas flows to cool.
  • the coolant connection 5 is opposite to the radiator block 3 connected to a line not shown.
  • connection piece 6 for example, as a plug and seal element, clamped.
  • a connection piece 6 is not simply plugged into the coolant connection 5 on the radiator block 3 of the exhaust gas cooler 1, but advantageously and optionally also formed self-sealing, so that no coolant can escape.
  • the connecting piece 6 has a round cross section and contains at its Inner wall 7 a flow guide 8.
  • the flow guide 8 is designed similar to a projection, and has a maximum in the center 9, which projects into the interior 10 of the connecting piece 6. Starting from the maximum 9, the flow-guiding device 8 has radially formed bulges 11, 12, which extend to the inner wall of the connecting piece 6. These bulges 11, 12 are formed symmetrically to the maximum 9 and are concave.
  • a section AA of the exhaust gas cooler 1 is in Fig. 2 shown. It can be seen that the coolant connection 5 encloses the connecting piece 6, wherein the flow guide 8 in its axial extent 13, starting from the radiator block 3 of the exhaust gas cooler 1 to the coolant port 5, which is arranged on the internal combustion engine, preferably on the cylinder head of the internal combustion engine, a parabolic Contour, which decreases from the radiator block 3 to the coolant port 5.
  • the maximum 9 represents the highest elevation of the flow guide 8, wherein the bulges 11, 12 of the flow guide 8, starting from the radiator block 3 to the coolant connection 5, drop.
  • the flow guide 8 is optimized in its radial orientation so that a certain ratio of the width of the coolant block 3 is given to its average width, always to ensure an optimal flow rate of the coolant to the gas flow rate of the exhaust gas cooler 1 and ensure that only a minimal Coolant needs to be provided to prevent the boiling of the coolant.
  • Fig. 4 shows an adjustment of the radial average width of the flow guide 8 to the block width of the coolant block 3 of approximately 3.
  • Fig. 5 is the coolant distribution adapted to the width of the coolant block 3 in that the block width to the average width of the flow guide 8 is about 2, while at Fig. 6 the block width to the average width is approximately 5.
  • the connecting piece 6 is designed so that it extends together with the flow guide 8 approximately to the inner edge of a housing 14 of the coolant block 3 and extends at maximum axial displacement to 2 mm in front of the inner edge of the housing 14.
  • the solution described shows a retrofittable coolant connection, in which a flow guide is integrated, which allows compensation of manufacturing tolerances and thermal expansions. The effect depends on the respective intrusion of the flow guide 8 into the connecting piece 6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

Technisches GebietTechnical area

Die Erfindung betrifft eine Vorrichtung zur Zuführung eines Kühlmittels zu einem Wärmeübertrager, vorzugsweise für einen Abgaskühler eines Verbrennungsmotors eines Kraftfahrzeuges, umfassend einen Anschlussstutzen.The invention relates to a device for supplying a coolant to a heat exchanger, preferably for an exhaust gas cooler of an internal combustion engine of a motor vehicle, comprising a connecting piece.

Stand der TechnikState of the art

Abgaskühler, wie sie in Kraftfahrzeugen verwendet werden, haben die Aufgabe, heißes Abgas von Verbrennungsmotoren zu kühlen, damit dieses gekühlte Abgas der Ansaugluft wieder beigemischt werden kann. Damit der thermodynamische Wirkungsgrad des Verbrennungsmotors nicht zu stark absinkt, ist eine Abkühlung auf ein niedriges Niveau anzustreben. Dieses Prinzip ist allgemein als gekühlte Abgasrückführung bekannt und wird angewandt, um eine Reduzierung von Schadstoffen im Abgas zu erreichen.Exhaust coolers, as used in motor vehicles, have the task of cooling hot exhaust gas from internal combustion engines, so that this cooled exhaust gas can be mixed back into the intake air. So that the thermodynamic efficiency of the internal combustion engine does not sink too much, a cooling to a low level is desirable. This principle is commonly known as cooled exhaust gas recirculation and is used to achieve a reduction of pollutants in the exhaust gas.

Bedingt durch sehr hohe Abgastemperaturen des Verbrennungsmotors kann das Kühlmittel vor allem in dem Gebiet direkt hinter dem Gaseintritt des Abgaskühlers zum Sieden kommen, was negative Auswirkungen auf die Lebensdauer des Abgaskühlers haben kann. Der Siedegefahr kann in begrenztem Maß durch eine Steigerung des Kühlmitteldurchsatzes entgegengewirkt werden. Technisch ist die Menge des durch den Abgaskühler strömenden Kühlmittels aber durch den kühlmittelseitigen Strömungswiderstand des Abgaskühlers begrenzt.Due to very high exhaust gas temperatures of the internal combustion engine, the coolant, especially in the area directly behind the gas inlet of the Exhaust gas cooler come to a boil, which can have a negative impact on the life of the exhaust gas cooler. The boiling risk can be counteracted to a limited extent by increasing the coolant throughput. Technically, however, the amount of coolant flowing through the exhaust gas cooler is limited by the coolant-side flow resistance of the exhaust gas cooler.

Aus der DE 10 2004 027 479 B3 ist eine Vorrichtung gemäss dem Oberbegriff des Patentanspruchs 1 mit einem System aus einem Ventil und einer Schutzkappe bekannt, bei weichem das Ventil mit einem Ende mit einer Leitung eines geschlossenen Fluidkreislaufes verbunden ist. Zwischen dem Ventil und der Schutzkappe ist dabei ein Dichtkörper angeordnet, um das Eindringen von Schmutzpartikeln in das Kühlmittel zu verhindern.From the DE 10 2004 027 479 B3 a device according to the preamble of claim 1 is known with a system of a valve and a protective cap, in which the valve is connected at one end to a line of a closed fluid circuit. In this case, a sealing body is arranged between the valve and the protective cap in order to prevent the penetration of dirt particles into the coolant.

Die DE 10 2012 221 325 A1 offenbart eine Wickelkopfkühlung, wobei zwei Kühlkreislaufkomponenten, welche eine elektrische Maschine kühlen, mittels eines so genannten Plug- und Seal-Elementes verbunden sind.The DE 10 2012 221 325 A1 discloses a winding head cooling, wherein two cooling circuit components, which cool an electric machine, are connected by means of a so-called plug and seal element.

DE 1815047 offenbart eine Vorrichtung zur Gasblasen-Abscheidung aus dem Kühlmittelstrom eines flüssigkeitsgekühlten Kernreaktors mit einer Strömungsleiteinrichtung für das Kühlmittel. DE 1815047 discloses a device for separating gas bubbles from the coolant flow of a liquid-cooled nuclear reactor with a flow guide for the coolant.

Darstellung der Erfindung, Aufgabe, Lösung, VorteilePresentation of the invention, object, solution, advantages

Es ist die Aufgabe der Erfindung, eine Vorrichtung zur Zuführung eines Kühlmittels in einen Wärmeübertrager, vorzugsweise in einen Abgaskühler eines Verbrennungsmotors eines Kraftfahrzeuges, zu schaffen, bei welcher der zur Verfügung stehende Kühlmitteldurchsatz effizient genutzt und eine Siedegefahr des Kühlmittels reduziert wird.It is the object of the invention to provide a device for supplying a coolant into a heat exchanger, preferably in an exhaust gas cooler of an internal combustion engine of a motor vehicle, in which the available coolant throughput is used efficiently and a boiling risk of the coolant is reduced.

Diese Aufgabe wird mit einer Vorrichtung nach den Merkmalen von Anspruch 1 gelöst.This object is achieved with a device according to the features of claim 1.

Ein Ausführungsbeispiel der Erfindung betrifft eine Vorrichtung zur Zuführung eines Kühlmittels in einen Wärmeübertrager, vorzugsweise in einen Abgaskühler eines Verbrennungsmotors eines Kraftfahrzeuges und ein Anschlussstutzen, wobei im Inneren des Anschlussstutzens eine vorsprungähnlich gestaltete Strömungsleiteinrichtung für das Kühlmittel integriert ist. Durch eine solche Strömungsleiteinrichtung wird das Kühlmittel schon beim Eintritt in den Wärmeübertrager möglichst gleichmäßig über den Querschnitt der Bestandteile des Wärmeübertragers verteilt, um dann gleich verteilt parallel zwischen den Rohren des Wärmeübertragers, welche das heiße Abgas führen, fließen zu können, wobei die Strömungsleiteinrichtung annähernd mittig an der Innenwandung, in einen Innenraum des Anschlussstutzens hineinragend, ausgebildet ist und eine Kontur der Strömungsleiteinrichtung in einer Längserstreckungsrichtung des Anschlussstutzens in Richtung des Wärmeübertragers ansteigend verläuft. Da diese Gleichverteilung in dem Gebiet direkt hinter dem Eintritt des zu kühlenden Fluids erfolgt, wird eine Siedegefahr des Kühlmittels herabgesetzt. Unter einer Gleichverteilung soll dabei im Weiteren eine gleiche Kühlmittelströmungsgeschwindigkeit des in den Wärmeübertrager einströmenden Kühlmittels verstanden werden.An embodiment of the invention relates to a device for supplying a coolant in a heat exchanger, preferably in an exhaust gas cooler of an internal combustion engine of a motor vehicle and a Connecting piece, wherein in the interior of the connecting piece a projection-like designed Strömungsleiteinrichtung for the coolant is integrated. By such Strömungsleiteinrichtung the coolant is evenly distributed as early as the entry into the heat exchanger over the cross section of the components of the heat exchanger, then evenly distributed parallel between the tubes of the heat exchanger, which carry the hot exhaust gas to flow, the Strömungsleiteinrichtung approximately centrally is formed on the inner wall, projecting into an inner space of the connecting piece, and a contour of the flow-guiding device increases in a direction of longitudinal extension of the connecting piece in the direction of the heat exchanger. Since this uniform distribution takes place in the area directly behind the entrance of the fluid to be cooled, a boiling risk of the coolant is reduced. An equal distribution is to be understood hereinafter as meaning an equal coolant flow velocity of the coolant flowing into the heat exchanger.

Dabei ist der Anschlussstutzen vorteilhaft als so genanntes Plug- und Seal-Element zum Einsatz in einen Kühlmittelanschluss ausgebildet.In this case, the connecting piece is advantageously designed as a so-called plug and seal element for use in a coolant connection.

Erfindungsgemäß ist die Strömungsleiteinrichtung annähernd mittig an der Innenwandung, in einen Innenraum des Anschlussstutzens hineinragend, ausgebildet, wobei eine Kontur der Strömungsleiteinrichtung in einer Längserstreckungsrichtung des Anschlussstutzens in Richtung des Wärmeübertragers ansteigend verläuft. Eine solche schanzenförmige Strömungsleiteinrichtung, die zu beiden Seiten mit dem Anschlussstutzen abschließt, erzeugt eine breit gefächerte Kühlmittelführung in Richtung des Wärmeübertragers als auch zu den Seiten innerhalb des Anschlussstutzens. Die Beschleunigung der Strömung erfolgt dabei annähernd konstant und findet etwa über die gesamte Länge des Anschlussstutzens statt.According to the invention, the flow-guiding device is formed approximately centrally on the inner wall, protruding into an inner space of the connecting piece, with a contour of the flow-guiding device rising in the longitudinal direction of the connecting piece in the direction of the heat exchanger. Such a ski-shaped flow guiding device, which terminates on both sides with the connecting piece, generates a diversified coolant guide in the direction of the heat exchanger as well as to the sides within the connecting piece. The acceleration of the flow is approximately constant and takes place approximately over the entire length of the connecting piece.

In einer Ausgestaltung verläuft ein axialer Anstieg der Kontur der Strömungsleiteinrichtung in Richtung des Wärmeübertragers linear. Ein solcher linearer Anstieg der in den Anschlussstutzen integrierten Strömungsleiteinrichtung ermöglicht konstruktiv den Anschluss von einer Leitung, die in mehrere Richtungen verzweigt werden kann.In one embodiment, an axial rise of the contour of the flow guide in the direction of the heat exchanger is linear. Such a linear increase of the integrated in the connecting piece flow guide allows constructive connection of a line that can be branched in several directions.

In einer Alternative verläuft der axiale Anstieg der Kontur der Strömungsleiteinrichtung in Richtung des Wärmeübertragers gemäß einer Potenzfunktion. Ein solcher Verlauf unterstützt die konstante Beschleunigung der Strömung des Kühlmittels und verringert somit die Gefahr des Siedens des Kühlmittels.In an alternative, the axial rise of the contour of the flow guide in the direction of the heat exchanger according to a power function. Such a course promotes the constant acceleration of the flow of the coolant and thus reduces the risk of boiling the coolant.

In einer Ausführungsform verläuft der axiale Anstieg der Kontur der Strömungsleiteinrichtung parabelförmig. Eine solche Ausgestaltung ermöglicht die Reduzierung des Kühlmittelbedarfes zur Siedevermeidung.In one embodiment, the axial rise of the contour of the flow guide parabolic. Such a design allows the reduction of the coolant requirement for boiling prevention.

Gemäss der Erfindung ist die Kontur der Strömungsleiteinrichtung in radialer Richtung des Anschlussstutzens annähernd spiegelsymmetrisch ausgebildet, wobei beidseitig zu einem mittig ausgebildeten Maximum sich eine Wölbung zur Innenwandung des Anschlussstutzens anschließt. Auch diese Wölbungen unterstützen eine Gleichverteilung der Kühlmittelströmungsgeschwindigkeit.According to the invention, the contour of the flow guide in the radial direction of the connecting piece is formed approximately mirror-symmetrical, on both sides to a centrally formed maximum is followed by a curvature to the inner wall of the connecting piece. These bulges also support an even distribution of the coolant flow velocity.

Vorteilhafterweise verläuft die jeweilige Wölbung ausgehend von dem Maximum der Strömungsleiteinrichtung konkav zur Innenwandung des Anschlussstutzens. Ein solcher Anschlussstutzen in einem Kühlmittelanschluss ermöglicht einen besonders bauraumeffizienten und optimierten Anschluss an den Abgaskühler ohne zusätzliche Schläuche oder Rohre direkt an den Verbrennungsmotor.Advantageously, the respective curvature runs from the maximum of the flow concave concave to the inner wall of the connecting piece. Such a connecting piece in a coolant connection allows a particularly space-efficient and optimized connection to the exhaust gas cooler without additional hoses or pipes directly to the internal combustion engine.

In einer Weiterbildung ist die radiale Ausrichtung der Kontur der Strömungsleiteinrichtung in Abhängigkeit von einer Breite des, den Fluidkreislauf enthaltenden Blockes bestimmt. Dadurch, dass der Kühlmitteleintritt beim Kühlmittelanschluss schmaler ist als der Block, ergibt sich normalerweise eine glockenförmige Verteilung des Kühlmittels, welches in der Mitte eine hohe Strömungsgeschwindigkeit aufweist, die zu den Seiten abfällt. Diese Unterschiede in der Strömungsgeschwindigkeit werden durch die erfindungsgemäße Vorrichtung abgebaut. Die Strömungsleiteinrichtung verteilt das einströmende Kühlmittel mit einer annähernd konstanten Kühlmittelströmungsgeschwindigkeit.In a further development, the radial alignment of the contour of the flow-guiding device is dependent on a width of the Fluid circuit containing block determined. The fact that the coolant inlet at the coolant connection is narrower than the block, usually results in a bell-shaped distribution of the coolant, which has a high flow velocity in the middle, which drops to the sides. These differences in the flow rate are reduced by the device according to the invention. The flow guide distributes the inflowing coolant at an approximately constant coolant flow rate.

In einer Ausgestaltung weist der Anschlussstutzen einen annähernd runden Querschnitt auf und ist direkt an dem Wärmeübertrager angeordnet.In one embodiment, the connection piece has an approximately round cross-section and is arranged directly on the heat exchanger.

Weitere vorteilhafte Ausgestaltungen sind durch die nachfolgende Figurenbeschreibung und durch die Unteransprüche beschrieben.Further advantageous embodiments are described by the following description of the figures and by the subclaims.

Kurze Beschreibung der Figuren der ZeichnungBrief description of the figures of the drawing

Nachstehend wird die Erfindung auf der Grundlage zumindest eines Ausführungsbeispiels anhand der Figuren der Zeichnung näher erläutert. Es zeigen:

Fig. 1
ein erstes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung am Eintrittsbereich eines Abgaskühlers,
Fig. 2
einen Schnitt A-A durch die erfindungsgemäße Vorrichtung und den Eintrittsbereich des Abgaskühlers gemäß Fig. 1,
Fig. 3
einen Schnitt B-B durch die erfindungsgemäße Vorrichtung und den Eintrittsbereich des Abgaskühlers gemäß Fig. 1,
Fig. 4
ein zweites Ausführungsbeispiel der erfindungsgemäßen Vorrichtung am Eintrittsbereich eines Abgaskühlers,
Fig. 5
ein drittes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung am Eintrittsbereich eines Abgaskühlers, und
Fig. 6
ein viertes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung am Eintrittsbereich eines Abgaskühlers.
The invention will be explained in more detail on the basis of at least one embodiment with reference to the figures of the drawing. Show it:
Fig. 1
A first embodiment of the device according to the invention at the inlet region of an exhaust gas cooler,
Fig. 2
a section AA through the device according to the invention and the inlet region of the exhaust gas cooler according to Fig. 1 .
Fig. 3
a section BB through the device according to the invention and the inlet region of the exhaust gas cooler according to Fig. 1 .
Fig. 4
A second embodiment of the device according to the invention at the inlet region of an exhaust gas cooler,
Fig. 5
a third embodiment of the device according to the invention at the inlet region of an exhaust gas cooler, and
Fig. 6
A fourth embodiment of the device according to the invention at the inlet region of an exhaust gas cooler.

Bevorzugte Ausführung der ErfindungPreferred embodiment of the invention

Figur 1 zeigt einen Eintrittsbereich für Abgas und Kühlmittel eines Abgaskühlers 1, wie er in Verbrennungsmotoren, vorzugsweise Dieselmotoren, in Kraftfahrzeugen eingesetzt wird, um das heiße, von dem Verbrennungsmotor abgegebene Abgas zu kühlen, damit dieses gekühlte Abgas der Ansaugluft des Verbrennungsmotors wieder beigemischt werden kann. Ein solcher Abgaskühler 1 besteht aus einem Diffusor 2, an welchen sich ein Kühlerblock 3 anschließt. Direkt an dem Kühlerblock 3, welcher mehrere parallel zueinander verlaufende Rohre 4 aufweist, in welchen das von dem Verbrennungsmotor erzeugte Abgas geleitet wird, ist ein Kühlmittelanschluss 5 befestigt, durch welchen ein Kühlmittel in den Kühlerblock 3 eingeführt wird, um die Rohre 4, durch welche das heiße Abgas strömt, zu kühlen. Der Kühlmittelanschluss 5 ist entgegengesetzt zum Kühlerblock 3 mit einer nicht weiter dargestellten Leitung verbunden. FIG. 1 shows an inlet region for exhaust gas and coolant of an exhaust gas cooler 1, as used in internal combustion engines, preferably diesel engines, in motor vehicles to cool the hot exhaust gas emitted from the internal combustion engine, so that this cooled exhaust gas can be added to the intake air of the internal combustion engine again. Such an exhaust gas cooler 1 consists of a diffuser 2, to which a radiator block 3 is connected. Directly on the radiator block 3, which has a plurality of mutually parallel tubes 4, in which the exhaust gas generated by the internal combustion engine is passed, a coolant port 5 is fixed, through which a coolant is introduced into the radiator block 3 to the tubes 4, through which the hot exhaust gas flows to cool. The coolant connection 5 is opposite to the radiator block 3 connected to a line not shown.

In den Kühlmittelanschluss 5 ist ein Anschlussstutzen 6, beispielsweise als Plug- und Seal-Element, geklemmt. Ein solcher Anschlussstutzen 6 ist nicht nur einfach in den Kühlmittelanschluss 5 auf den Kühlerblock 3 des Abgaskühlers 1 einsteckbar, sondern vorteilhaft und optional auch selbstdichtend ausgebildet, so dass kein Kühlmittel austreten kann. Der Anschlussstutzen 6 besitzt einen runden Querschnitt und enthält an seiner Innenwandung 7 eine Strömungsleiteinrichtung 8. Die Strömungsleiteinrichtung 8 ist vorsprungähnlich gestaltet, und weist mittig ein Maximum 9 auf, welches in den Innenraum 10 des Anschlussstutzens 6 hineinragt. Ausgehend von dem Maximum 9 besitzt die Strömungsleiteinrichtung 8 radial ausgebildete Wölbungen 11, 12, die zur Innenwandung des Anschlussstutzens 6 verlaufen. Diese Wölbungen 11, 12 sind dabei zum Maximum 9 symmetrisch ausgebildet und verlaufen konkav.In the coolant connection 5, a connection piece 6, for example, as a plug and seal element, clamped. Such a connection piece 6 is not simply plugged into the coolant connection 5 on the radiator block 3 of the exhaust gas cooler 1, but advantageously and optionally also formed self-sealing, so that no coolant can escape. The connecting piece 6 has a round cross section and contains at its Inner wall 7 a flow guide 8. The flow guide 8 is designed similar to a projection, and has a maximum in the center 9, which projects into the interior 10 of the connecting piece 6. Starting from the maximum 9, the flow-guiding device 8 has radially formed bulges 11, 12, which extend to the inner wall of the connecting piece 6. These bulges 11, 12 are formed symmetrically to the maximum 9 and are concave.

Ein Schnitt A-A des Abgaskühlers 1 ist in Fig. 2 dargestellt. Daraus ist ersichtlich, dass der Kühlmittelanschluss 5 den Anschlussstutzen 6 umschließt, wobei die Strömungsleiteinrichtung 8 in ihrer axialen Erstreckung 13 ausgehend von dem Kühlerblock 3 des Abgaskühlers 1 bis zu dem Kühlmittelanschluss 5, welcher am Verbrennungsmotor, vorzugsweise am Zylinderkopf des Verbrennungsmotor angeordnet ist, eine parabelförmige Kontur aufweist, welche vom Kühlerblock 3 zum Kühlmittelanschluss 5 abnimmt.A section AA of the exhaust gas cooler 1 is in Fig. 2 shown. It can be seen that the coolant connection 5 encloses the connecting piece 6, wherein the flow guide 8 in its axial extent 13, starting from the radiator block 3 of the exhaust gas cooler 1 to the coolant port 5, which is arranged on the internal combustion engine, preferably on the cylinder head of the internal combustion engine, a parabolic Contour, which decreases from the radiator block 3 to the coolant port 5.

Wie aus Fig. 3 in dem Schnitt B-B ersichtlich ist, stellt das Maximum 9 die höchste Erhebung der Strömungsleiteinrichtung 8 dar, wobei auch die Wölbungen 11, 12 der Strömungsleiteinrichtung 8, ausgehend von dem Kühlerblock 3 zum Kühlmittelanschluss 5, abfallen.How out Fig. 3 can be seen in the section BB, the maximum 9 represents the highest elevation of the flow guide 8, wherein the bulges 11, 12 of the flow guide 8, starting from the radiator block 3 to the coolant connection 5, drop.

Die Strömungsleiteinrichtung 8 ist in ihrer radialen Ausrichtung so optimiert, dass ein bestimmtes Verhältnis von der Breite des Kühlmittelblockes 3 zu deren Durchschnittsbreite gegeben ist, um jeweils immer eine optimale Strömungsgeschwindigkeit des Kühlmittels gegenüber dem Gasdurchsatz des Abgaskühlers 1 zu gewährleisten und sicherzustellen, dass nur ein minimaler Kühlmittelbedarf zur Vermeidung des Siedens des Kühlmittels zur Verfügung gestellt werden muss. Fig. 4 zeigt eine Anpassung der radialen Durchschnittsbreite der Strömungsleiteinrichtung 8 zur Blockbreite des Kühlmittelblockes 3 von ungefähr 3. Gemäß Fig. 5 ist die Kühlmittelverteilung an die Breite des Kühlmittelblockes 3 dahingehend angepasst, dass die Blockbreite zur Durchschnittsbreite der Strömungsleiteinrichtung 8 ungefähr 2 beträgt, während bei Fig. 6 die Blockbreite zur Durchschnittsbreite annähernd 5 beträgt.The flow guide 8 is optimized in its radial orientation so that a certain ratio of the width of the coolant block 3 is given to its average width, always to ensure an optimal flow rate of the coolant to the gas flow rate of the exhaust gas cooler 1 and ensure that only a minimal Coolant needs to be provided to prevent the boiling of the coolant. Fig. 4 shows an adjustment of the radial average width of the flow guide 8 to the block width of the coolant block 3 of approximately 3. According Fig. 5 is the coolant distribution adapted to the width of the coolant block 3 in that the block width to the average width of the flow guide 8 is about 2, while at Fig. 6 the block width to the average width is approximately 5.

Der Anschlussstutzen 6 ist so ausgeführt, dass es gemeinsam mit der Strömungsleiteinrichtung 8 etwa bis zur Innenkante eines Gehäuses 14 des Kühlmittelblockes 3 reicht und bei maximaler axialer Verschiebung bis 2 mm vor die Innenkante des Gehäuses 14 reicht. Somit ist ein Ausgleich von Fertigungstoleranzen und thermischer Dehnung möglich, insbesondere dann, wenn es sich noch vorteilhafterweise um 2° kippen lässt.The connecting piece 6 is designed so that it extends together with the flow guide 8 approximately to the inner edge of a housing 14 of the coolant block 3 and extends at maximum axial displacement to 2 mm in front of the inner edge of the housing 14. Thus, a compensation of manufacturing tolerances and thermal expansion is possible, especially if it can be tilted even more advantageous by 2 °.

Die beschriebene Lösung zeigt einen nachrüstbaren Kühlmittelanschluss, in welchem eine Strömungsleiteinrichtung integriert ist, die einen Ausgleich von Fertigungstoleranzen und thermischen Ausdehnungen ermöglicht. Die Wirkung hängt vom jeweiligen Hineinragen der Strömungsleiteinrichtung 8 in den Anschlussstutzen 6 ab.The solution described shows a retrofittable coolant connection, in which a flow guide is integrated, which allows compensation of manufacturing tolerances and thermal expansions. The effect depends on the respective intrusion of the flow guide 8 into the connecting piece 6.

Claims (8)

  1. An apparatus for supplying a coolant to a heat exchanger, preferably an exhaust gas cooler of an internal combustion engine of a motor vehicle, comprising a connecting stub (6), characterised in that the connecting stub is designed for insertion into a coolant connection (5), wherein a flow-directing device (8), which is of projection-like design, for the coolant is integrated in the interior of the connecting stub, wherein the flow-directing device (8) is formed approximately centrally on the inner wall, in a manner projecting into an interior (10) of the connecting stub (6), and a contour of the flow-directing device (8) runs in a direction of longitudinal extent (13) of the connecting stub (6) in a manner rising in the direction of the heat exchanger, wherein the contour of the flow-directing device (8) is of approximately mirror-symmetrical design in the radial direction of the connecting stub (6), wherein a respective curvature (11, 12) adjoins the inner wall (7) of the connecting stub (6) on both sides with respect to a centrally formed maximum (9).
  2. The apparatus according to claim 1, characterised in that the connecting stub is designed as a plug and seal element.
  3. The apparatus according to claim 1 or 2, characterised in that an axial rise of the contour of the flow-directing device (8) runs linearly in the direction of the heat exchanger.
  4. The apparatus according to claim 1 or 2, characterised in that the axial rise of the contour of the flow-directing device (8) in the direction of the heat exchanger runs at least approximately in accordance with a power function.
  5. The apparatus according to claim 4, characterised in that the axial rise of the contour of the flow-directing device (8) runs parabolically.
  6. The apparatus according to one of claims 1 to 5, characterised in that the respective curvature (11, 12) runs concavely from the maximum (9) of the flow-directing device (8) to the inner wall (7) of the connecting stub (6).
  7. The apparatus according to one of claim 1 to 6, characterised in that the radial orientation of the contour of the flow-directing device (8) is determined depending on a width of the block (3) of the heat exchanger.
  8. The apparatus according to one of the preceding claims, characterised in that the connecting stub (6) has a circular or approximately round cross-section and is inserted in the coolant connection (5).
EP15184620.1A 2014-09-22 2015-09-10 Device for feeding a coolant to a heat exchanger, preferably for an exhaust gas cooler of a combustion engine of a motor vehicle Active EP2998684B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014219078.9A DE102014219078A1 (en) 2014-09-22 2014-09-22 Device for supplying a coolant to a heat exchanger, preferably for an exhaust gas cooler of an internal combustion engine of a motor vehicle

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EP2998684A1 EP2998684A1 (en) 2016-03-23
EP2998684B1 true EP2998684B1 (en) 2019-11-06

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DE102014219078A1 (en) 2016-03-24
US9708944B2 (en) 2017-07-18
JP2016070654A (en) 2016-05-09
US20160084128A1 (en) 2016-03-24
EP2998684A1 (en) 2016-03-23

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