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EP2622299A2 - Heat exchanger - Google Patents

Heat exchanger

Info

Publication number
EP2622299A2
EP2622299A2 EP11757177.8A EP11757177A EP2622299A2 EP 2622299 A2 EP2622299 A2 EP 2622299A2 EP 11757177 A EP11757177 A EP 11757177A EP 2622299 A2 EP2622299 A2 EP 2622299A2
Authority
EP
European Patent Office
Prior art keywords
planar wall
heat exchanger
wall portions
plates
recess
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.)
Granted
Application number
EP11757177.8A
Other languages
German (de)
French (fr)
Other versions
EP2622299B1 (en
Inventor
Heinrich J Kuehne
Thomas Cott
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.)
Hydac Cooling GmbH
Original Assignee
Hydac Cooling GmbH
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 Hydac Cooling GmbH filed Critical Hydac Cooling GmbH
Publication of EP2622299A2 publication Critical patent/EP2622299A2/en
Application granted granted Critical
Publication of EP2622299B1 publication Critical patent/EP2622299B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F28D9/0062—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 spaced plates with inserted 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
    • 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

Definitions

  • the invention relates to a heat exchanger, in particular for Fluidkühlvor- directions, with a package of plane-parallel plates, between pairs of superimposed plates in alternation fürström Kunststoffe for a hot medium and a cooling medium are formed, which are laterally bounded by the plates at a distance holding profile strips which form soldering surfaces adjacent to the plates, the profiled strips extending along the flow-through regions of one medium and the other medium along edges of the plates which are at an angle to one another and wherein at least the profiled strips of the flow-through regions of the cooling medium comprise a main body, two extending from it The limbs extending limbs and between these have an open to the adjacent flow area recess.
  • Heat exchangers of this type are state of the art, cf. DE 20 208 748 U1.
  • air as the cooling medium
  • heat exchangers are often used for cooling hydraulic fluids for the working hydraulics of mechanical systems, such as construction machinery.
  • the heat exchangers are exposed not only to mechanical loads, but also to thermal loads due to the high operating temperature of the fluids to be cooled. This is especially the Fall, when intermittent operations, temperature jumps result, which leads due to material strains to strong voltages in the package of components that are connected by soldering to form a rigid block. The result is stress cracks, especially in the area of the solder joints, with the risk of failure of the heat exchanger and thus the threat to the associated system.
  • the invention has for its object to provide a heat exchanger available, which is characterized by an improved resistance to operating loads, so that a safe long-term operation is possible.
  • a significant feature of the invention is that the shape of the adjacent to the solder surfaces of the leg cross-section is optimized in terms of avoiding excessive stresses by special shaping of the recess at least in the adjacent to the cooling medium profile strips , Due to the fact that the recess, starting from the inner end portion, has planar wall parts, an at least approximately linear change of the flexural strength over the length of the profile legs can be achieved, so that by selecting the length and / or the inclination of these planar wall parts relative to the surface of the soldering surface an optimal bending behavior of the legs is achievable.
  • the arrangement may in this case be such that the recess, starting from its inner end portion, diverging first planar wall parts, which become narrow points of the
  • Cross-section of the legs extend to join the bottlenecks- de, converging second planar wall parts and adjoining third planar wall parts which, parallel to the soldering surfaces, extend in the vicinity of the opening of the recess.
  • zones of lower flexural strength are formed on the profile limbs, adjoining leg sections on both sides in which the bending resistance increases substantially linearly.
  • the bottlenecks not only define a bending line of a kind of bending joint, but also represent the location of the steepest temperature gradient. Since this is effective at the location of the smallest material cross section, correspondingly low material expansions and stresses result.
  • the recess is shaped in such a way that adjoin the third planar wall parts fourth planar wall parts which extend slightly divergent to the opening of the recess to each other.
  • the first planar wall portions may form mutually perpendicular planes, and the second planar wall portions may include an obtuse angle with the first planar wall portions, which is preferably only slightly larger than a right angle.
  • the cross-sectional shape of the recess in the region adjacent to the inner end corresponds approximately to a square open towards the opening.
  • the arrangement can be made such that the first planar wall parts are connected to each other and these with the second planar wall parts each over curved wall locations with the same radius of curvature.
  • the second planar wall parts are preferably also provided with the third planar wall parts and those with the fourth planar wall parts also each with arched wall locations connected to the same, the second radius of curvature, which is twice the first radius of curvature.
  • the arrangement is preferably such that the thickness of the cross section of the legs in the region of the third planar wall parts is approximately twice the thickness of the cross section at the bottlenecks is.
  • perspective oblique view ledigl I a corner region of a portion of the plate pack of an embodiment of the heat exchanger according to the invention and an enlarged drawn side view only a profile bar to form a spacer between plates of the package.
  • FIG. 1 illustrates an exemplary embodiment in the form of a conventional plate-type heat exchanger with a stack of flat plates 1, preferably made of an aluminum alloy, which run in parallel planes and form separating plates for flow areas located between them, wherein between successive pairs of plates in alternation in each case a flow area 3 for the medium to be cooled, for example, hydraulic oil, and a flow area 5 for a cooling medium, such as cooling air, are formed.
  • a flow area 3 for the medium to be cooled for example, hydraulic oil
  • a flow area 5 for a cooling medium such as cooling air
  • the flow area 3 for the hot medium lying above in the drawing is closed on two opposite sides by conventionally shaped end strips 7, between which the respective inflow and outflow areas are located, turbulators 9 being connected between the end strips 7 in the usual way are provided in the form of slats.
  • the flow area 5 of the cooling medium is laterally also bounded by end strips, which form the spacers between the respective plate pair and which are formed as a professional Most 1 1 with special, inventive design.
  • This embodiment of the invention is explained in more detail with reference to FIG.
  • the profile strips 1 1 which are also preferably extruded from an aluminum alloy, have a cuboid or block-shaped basic body 1 3 facing the edge region of the plates 1, a recess 15 in the form of a continuous longitudinal groove and the recess 15 limbs bounding on both sides 1 7 on.
  • the recess 15 is open to the flow-through region 5, in which cooling fins 19 are located, which, just like the turbulators 9 in the flow-through region 3, increase the effective heat transfer area.
  • the inner end portion 23 ( Figure 2) of the recess 1 5 is located from the closed end 21 of the profile strip 1 1 at a distance which is slightly greater than the distance between the end portion 23 and opening of the recess 15.
  • the lips 27 support the lamellae 5 in front of the end of the soldering surfaces 25, so that when stacking the risk is avoided that lamella ends penetrate into the gap between the plate 1 and solder 25.
  • the recess 1 starting from its inner end portion 23, bounded by planar wall portions 29 which, diverging to each other and enclosing a right angle, extend into the vicinity of the respective soldering surface 25 and there a Profilengstelle 31 of the profile cross section of the legs 1 7 form.
  • the constriction 31 is adjoined by second planar wall parts 33, which converge in a convergent manner and enclose an obtuse angle with the first planar wall parts 29, which angle is slightly larger than a right angle.
  • the length of these second planar wall portions 33 is slightly smaller than the length of the first planar wall portions 29, and these third planar wall portions 33 are followed by third planar wall portions 35 defining planes parallel to the soldering surfaces 25 and extending into the vicinity of the opening the recess 15 extend. At this third planar wall portions 35 in turn close fourth planar wall portions 37 which extend slightly divergent to the opening of the recess 15 to each other.
  • the connection of the first planar wall portions 29 with each other and with the second planar wall portions 33 takes place in each case via curved wall portions 39 with the same radius of curvature.
  • the connection of the second planar wall portions 33 with the third planar wall portions 35 and this with the fourth planar wall portions 37 also takes place over curved wall portions 41, in which the radius of curvature is twice the radius of curvature at the wall portions 39.
  • the inventively provided cross-sectional shape of the recess 1 5 results in an effective reduction of operational voltage peaks and the risk of cracking at the solder joints.
  • the bottlenecks 31st on the thigh profile the location of the steepest temperature gradient.
  • this is also the location of the smallest material cross-section, so that thermal deformations are limited to correspondingly limited material parts. Since the profile thickness of the legs 1 7, starting from the constrictions 31, increases towards the opening to a profile thickness which corresponds approximately to twice the constrictions 31, an optimum stress distribution over the area of the soldering surfaces 25 results.
  • the heat exchanger device according to the invention need not be limited to the field of fluid cooling, but can also be used generally for the cooling of gaseous media and here in particular intercooler (diesel engines), as well as secondary and intercooler (compressors) to include.
  • intercooler diesel engines
  • secondary and intercooler compressors
  • the temperature differences (cooling air to medium) in the pertinent applications are comparatively much higher than described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Abstract

A heat exchanger, in particular for fluid cooling devices, having a stack of plane-parallel plates (1), wherein throughflow regions (3, 5) for a hot medium and for a cooling medium are formed alternately between pairs of plates (1) lying one on top of the other, which throughflow regions are in each case delimited laterally by profile strips (7, 11) which hold the plates (1) spaced apart from one another and which form solder surfaces (25) bearing against the plates (1), wherein the profile strips (7, 11) extend along the throughflow regions (3, 5) of one medium and of the other medium from edges, which meet one another at an angle, of the plates (1), and wherein at least the profile strips (11) of the throughflow regions (5) of the cooling medium have a basic body (13), two legs (17) extending from said basic body along the solder surfaces (25), and between said legs a recess (15) which is open toward the adjoining throughflow region (5), is characterized in that the recess (15) is delimited, at least in the region adjoining its inner end portion (23), by planar wall parts (29).

Description

Wärmetauscher  heat exchangers
Die Erfindung betrifft einen Wärmetauscher, insbesondere für Fluidkühlvor- richtungen, mit einem Paket aus planparallelen Platten, wobei zwischen Paaren übereinanderliegender Platten im Wechsel Durchströmbereiche für ein heißes Medium und für ein Kühlmedium gebildet sind, die jeweils durch die Platten auf Abstand haltende Profilleisten seitlich begrenzt sind, die an den Platten anl iegende Lötflächen bilden, wobei sich die Profilleisten an den Durchströmbereichen des einen Mediums und des anderen Mediums entlang von im Winkel aneinanderstoßender Ränder der Platten erstrecken und wobei zumindest die Profilleisten der Durchströmbereiche des Kühlmediums einen Grundkörper, zwei sich von diesem entlang der Lötflächen erstreckende Schenkel sowie zwischen diesen eine zum angrenzenden Durchströmbereich offene Ausnehmung aufweisen. The invention relates to a heat exchanger, in particular for Fluidkühlvor- directions, with a package of plane-parallel plates, between pairs of superimposed plates in alternation Durchströmbereiche for a hot medium and a cooling medium are formed, which are laterally bounded by the plates at a distance holding profile strips which form soldering surfaces adjacent to the plates, the profiled strips extending along the flow-through regions of one medium and the other medium along edges of the plates which are at an angle to one another and wherein at least the profiled strips of the flow-through regions of the cooling medium comprise a main body, two extending from it The limbs extending limbs and between these have an open to the adjacent flow area recess.
Wärmetauscher dieser Art, auch Lamellenkühler genannt, sind Stand der Technik, vgl. DE 20 208 748 U1 . Mit Luft als Kühlmedium werden solche Wärmetauscher vielfach zur Kühlung von Hydraulikflüssigkeiten für die Arbeitshydraulik maschineller Anlagen, wie Baumaschinen od. dgl., für hydrostatische Fahrantriebe oder als Ölkühler für hoch belastete Getriebe, namentlich bei Windkraftanlagen, eingesetzt. Beim Betrieb derartiger Anla- gen sind die Wärmetauscher nicht nur mechanischen Belastungen, sondern wegen der hohen Betriebstemperatur abzukühlender Fluide in besonderem Maße auch thermischen Belastungen ausgesetzt. Dies ist insbesondere der Fall, wenn sich durch intermittierende Betriebsweisen Temperatursprünge ergeben, was aufgrund von Werkstoffdehnungen zu starken Spannungen in dem Paket der Komponenten führt, die durch Löten zu einem starren Block verbunden sind. Die Folge sind Spannungsrisse, insbesondere im Bereich der Lötnähte, mit der Gefahr des Versagens des Wärmetauschers und damit der Gefährdung des zugehörigen Systems. Heat exchangers of this type, also called lamella coolers, are state of the art, cf. DE 20 208 748 U1. With air as the cooling medium, such heat exchangers are often used for cooling hydraulic fluids for the working hydraulics of mechanical systems, such as construction machinery. Like., For hydrostatic travel drives or as oil cooler for high-loaded transmission, especially in wind turbines. In the operation of such systems, the heat exchangers are exposed not only to mechanical loads, but also to thermal loads due to the high operating temperature of the fluids to be cooled. This is especially the Fall, when intermittent operations, temperature jumps result, which leads due to material strains to strong voltages in the package of components that are connected by soldering to form a rigid block. The result is stress cracks, especially in the area of the solder joints, with the risk of failure of the heat exchanger and thus the threat to the associated system.
Im Hinblick auf diese Problematik liegt der Erfindung die Aufgabe zugrunde, einen Wärmetauscher zur Verfügung zu stellen, der sich durch eine verbesserte Widerstandsfähigkeit gegen Betriebsbelastungen auszeichnet, so dass ein sicherer Langzeitbetrieb ermöglicht ist. In view of this problem, the invention has for its object to provide a heat exchanger available, which is characterized by an improved resistance to operating loads, so that a safe long-term operation is possible.
Erfindungsgemäß ist diese Aufgabe durch einen Wärmetauscher gelöst, der die Merkmale des Patentanspruches 1 in seiner Gesamtheit aufweist. According to the invention this object is achieved by a heat exchanger having the features of claim 1 in its entirety.
Nach dem kennzeichnenden Teil des Anspruches 1 besteht eine wesentliche Besonderheit der Erfindung darin, dass durch spezielle Formgebung der Ausnehmung zumindest bei den an das Kühlmedium angrenzenden Profilleisten die Form des an die Lötflächen der Schenkel angrenzenden Quer- Schnittes im Hinblick auf die Vermeidung übermäßiger Spannungen optimiert ist. Dadurch, dass die Ausnehmung, ausgehend vom inneren Endabschnitt, ebenflächige Wandteile aufweist, läßt sich eine zumindest nähe- rungsweis lineare Änderung der Biegefestigkeit über die Länge der Profilschenkel erreichen, so dass durch Wahl der Länge und/oder der Neigung dieser ebenflächigen Wandteile relativ zur Lötflächenebene ein optimales Biegeverhalten der Schenkel erreichbar ist. According to the characterizing part of claim 1, a significant feature of the invention is that the shape of the adjacent to the solder surfaces of the leg cross-section is optimized in terms of avoiding excessive stresses by special shaping of the recess at least in the adjacent to the cooling medium profile strips , Due to the fact that the recess, starting from the inner end portion, has planar wall parts, an at least approximately linear change of the flexural strength over the length of the profile legs can be achieved, so that by selecting the length and / or the inclination of these planar wall parts relative to the surface of the soldering surface an optimal bending behavior of the legs is achievable.
In besonders vorteilhafter Weise kann die Anordnung hierbei so getroffen sein, dass die Ausnehmung, ausgehend von ihrem inneren Endabschnitt, divergierende erste ebenflächige Wandteile, die sich zu Engstellen desIn a particularly advantageous manner, the arrangement may in this case be such that the recess, starting from its inner end portion, diverging first planar wall parts, which become narrow points of the
Querschnittes der Schenkel erstrecken, sich an die Engstellen anschließen- de, konvergierende zweite ebenflächige Wandteile sowie sich daran anschließende dritte ebenflächige Wandteile aufweist, die sich, zu den Lötflächen parallel, in die Nähe der Öffnung der Ausnehmung erstrecken. Cross-section of the legs extend to join the bottlenecks- de, converging second planar wall parts and adjoining third planar wall parts which, parallel to the soldering surfaces, extend in the vicinity of the opening of the recess.
Dadurch sind an den Profilschenkeln Zonen geringerer Biegefestigkeit ge- bildet, an die sich zu beiden Seiten Schenkelabschnitte anschließen, in denen der Biegewiderstand im Wesentlichen linear zunimmt. Die Engstellen definieren nicht nur eine Biegelinie einer Art Biegegelenk, sondern stellen auch den Ort des steilsten Temperaturgradienten dar. Da dieser am Ort des geringsten Materialquerschnitts wirksam ist, ergeben sich entsprechend ge- ringe Materialdehnungen und -Spannungen. As a result, zones of lower flexural strength are formed on the profile limbs, adjoining leg sections on both sides in which the bending resistance increases substantially linearly. The bottlenecks not only define a bending line of a kind of bending joint, but also represent the location of the steepest temperature gradient. Since this is effective at the location of the smallest material cross section, correspondingly low material expansions and stresses result.
Bei besonders vorteilhaften Ausführungsbeispielen ist die Ausnehmung in der Weise geformt, dass sich an die dritten ebenflächigen Wandteile vierte ebenflächige Wandteile anschließen, die zueinander leicht divergierend bis zur Öffnung der Ausnehmung verlaufen. In particularly advantageous embodiments, the recess is shaped in such a way that adjoin the third planar wall parts fourth planar wall parts which extend slightly divergent to the opening of the recess to each other.
Vorzugsweise können die ersten ebenflächigen Wandteile zueinander senkrechte Ebenen bilden, und die zweiten ebenflächigen Wandteile können mit den ersten ebenflächigen Wandteilen einen stumpfen Winkel einschlie- ßen, der vorzugsweise lediglich geringfügig größer als ein rechter Winkel ist. Damit entspricht die Querschnittsform der Ausnehmung in dem an das innere Ende angrenzenden Bereich in etwa einem zur Öffnung hin offenen Quadrat. Mit Vorteil kann die Anordnung so getroffen sein, dass die ersten ebenflächigen Wandteile miteinander und diese mit den zweiten ebenflächigen Wandteilen jeweils über gewölbte Wandstellen mit gleichem Krümmungsradius verbunden sind. Die zweiten ebenflächigen Wandteile sind mit den dritten ebenflächigen Wandteilen und diese mit den vierten ebenflächigen Wandteilen vorzugsweise auch jeweils über gewölbte Wandstellen mit gleichem, zweitem Krümmungsradius verbunden, der das Doppelte des ersten Krümmungsradius beträgt. Preferably, the first planar wall portions may form mutually perpendicular planes, and the second planar wall portions may include an obtuse angle with the first planar wall portions, which is preferably only slightly larger than a right angle. Thus, the cross-sectional shape of the recess in the region adjacent to the inner end corresponds approximately to a square open towards the opening. Advantageously, the arrangement can be made such that the first planar wall parts are connected to each other and these with the second planar wall parts each over curved wall locations with the same radius of curvature. The second planar wall parts are preferably also provided with the third planar wall parts and those with the fourth planar wall parts also each with arched wall locations connected to the same, the second radius of curvature, which is twice the first radius of curvature.
Hinsichtlich der Dimensionierung der Engstellen relativ zur Querschnitts- dicke der sich in Richtung auf die Öffnung anschließenden Schenkel ist die Anordnung vorzugsweise so getroffen, dass die Dicke des Querschnitts der Schenkel im Bereich der dritten ebenflächigen Wandteile in etwa das Doppelte der Dicke des Querschnittes an den Engstellen beträgt. Nachstehend ist die Erfindung anhand der Zeichnung im einzelnen erläutert. With regard to the dimensioning of the bottlenecks relative to the cross-sectional thickness of the legs adjoining the opening, the arrangement is preferably such that the thickness of the cross section of the legs in the region of the third planar wall parts is approximately twice the thickness of the cross section at the bottlenecks is. The invention is explained in detail below with reference to the drawing.
Es zeigen:  Show it:
Fig.1 in der Art einer explosionsartig auseinander gezogenen Fig.1 in the manner of an exploded exploded
perspektivischen Schrägansicht ledigl ich einen Eckbereich eines Teils des Plattenpakets eines Ausführungsbeispiels des erfindungsgemäßen Wärmetauschers und eine vergrößert gezeichnete Seitenansicht lediglich einer Profil leiste zur Bildung eines Abstandhalters zwischen Platten des Pakets.  perspective oblique view ledigl I a corner region of a portion of the plate pack of an embodiment of the heat exchanger according to the invention and an enlarged drawn side view only a profile bar to form a spacer between plates of the package.
Die Fig.1 verdeutlicht ein Ausführungsbeispiel in Form eines in üblicher Plattenbauweise gefertigten Wärmetauschers mit einem Stapel ebener Platten 1 , vorzugsweise aus einer Aluminiumlegierung, die in parallelen Ebenen verlaufen und Trennplatten für zwischen ihnen befindliche Durchströmbereiche bilden, wobei zwischen aufeinanderfolgenden Plattenpaaren im Wechsel jeweils ein Durchströmbereich 3 für das zu kühlende Medium, beispielsweise Hydrauliköl, und ein Durchströmbereich 5 für ein Kühlmedium, etwa Kühl luft, gebildet sind. Wie aus Fig.1 ersichtlich ist, erstrecken sich die Durchströmbereiche 3 und 5 im rechten Winkel zueinander. Der in der Zeichnung oben liegende Durchströmbereich 3 für das heiße Medium ist an zwei einander gegenüberliegenden Seiten durch in üblicher Weise gestaltete Abschlußleisten 7 geschlossen, zwischen denen sich der jewei- lige Zuström- und Abströmbereich befindet, wobei zwischen den Abschlußleisten 7 in üblicher weise Turbulatoren 9 in der Art von Lamellen vorgesehen sind. 1 illustrates an exemplary embodiment in the form of a conventional plate-type heat exchanger with a stack of flat plates 1, preferably made of an aluminum alloy, which run in parallel planes and form separating plates for flow areas located between them, wherein between successive pairs of plates in alternation in each case a flow area 3 for the medium to be cooled, for example, hydraulic oil, and a flow area 5 for a cooling medium, such as cooling air, are formed. As can be seen from Fig.1, extend the Durchströmbereiche 3 and 5 at right angles to each other. The flow area 3 for the hot medium lying above in the drawing is closed on two opposite sides by conventionally shaped end strips 7, between which the respective inflow and outflow areas are located, turbulators 9 being connected between the end strips 7 in the usual way are provided in the form of slats.
Der Durchströmbereich 5 des Kühlmediums ist seitlich jeweils ebenfalls durch Abschlußleisten begrenzt, die die Abstandhalter zwischen dem jeweiligen Plattenpaar bilden und die als Profi Meisten 1 1 mit besonderer, erfindungsgemäßer Gestaltung gebildet sind. Diese erfindungsgemäße Ausbildung ist anhand der Fig.2 näher erläutert. Wie ersichtlich, weisen die ebenfalls aus einer Aluminiumlegierung vorzugsweise stranggepreßten Profilleisten 1 1 einen quader- oder blockförmi- gen Grundkörper 1 3, der dem Randbereich der Platten 1 zugewandt ist, eine Ausnehmung 1 5 in Form einer durchgehenden Längsnut sowie die Ausnehmung 15 beidseits begrenzende Schenkel 1 7 auf. Wie Fig.1 zeigt, ist die Ausnehmung 1 5 zum Durchströmbereich 5 hin offen, in dem sich Kühllamellen 19 befinden, die, ebenso wie die Turbulatoren 9 im Durchströmbereich 3, die effektive Wärmeübertragungsfläche vergrößern. Der innere Endabschnitt 23 (Fig.2) der Ausnehmung 1 5 befindet sich vom geschlossenen Ende 21 der Profilleiste 1 1 in einem Abstand, der etwas größer ist als der Abstand zwischen Endabschnitt 23 und Öffnung der Ausnehmung 15. Die ebenen oberen und unteren Endflächen der Profilleiste 1 1 , also vom Grundkörper 1 3 bis zum Endbereich der Schenkel 17, bilden die Lötflächen 25 für die Verbindung des Plattenpakets. Am offenen Ende der Ausnehmung 15 befinden sich lippenartige Vorsprünge 27. Wie Fig.1 zeigt, stützen die Lippen 27 die Lamellen 5 vor dem Ende der Lötflächen 25 ab, so dass bei der Stapelbildung die Gefahr vermieden ist, dass Lamellenenden in den Spalt zwischen Platte 1 und Lötfläche 25 eindringen. The flow area 5 of the cooling medium is laterally also bounded by end strips, which form the spacers between the respective plate pair and which are formed as a professional Most 1 1 with special, inventive design. This embodiment of the invention is explained in more detail with reference to FIG. As can be seen, the profile strips 1 1, which are also preferably extruded from an aluminum alloy, have a cuboid or block-shaped basic body 1 3 facing the edge region of the plates 1, a recess 15 in the form of a continuous longitudinal groove and the recess 15 limbs bounding on both sides 1 7 on. As FIG. 1 shows, the recess 15 is open to the flow-through region 5, in which cooling fins 19 are located, which, just like the turbulators 9 in the flow-through region 3, increase the effective heat transfer area. The inner end portion 23 (Figure 2) of the recess 1 5 is located from the closed end 21 of the profile strip 1 1 at a distance which is slightly greater than the distance between the end portion 23 and opening of the recess 15. The flat upper and lower end surfaces of Profile strip 1 1, ie from the base body 1 3 to the end of the legs 17, form the solder pads 25 for the connection of the plate package. At the open end of the recess 15 are lip-like projections 27. As shown in FIG. 1, the lips 27 support the lamellae 5 in front of the end of the soldering surfaces 25, so that when stacking the risk is avoided that lamella ends penetrate into the gap between the plate 1 and solder 25.
Die Ausnehmung 1 5 ist, von ihrem inneren Endabschnitt 23 ausgehend, durch ebenflächige Wandteile 29 begrenzt, die sich, zueinander divergierend und einen rechten Winkel einschließend, bis in die Nähe der betreffenden Lötfläche 25 erstrecken und dort eine Profilengstelle 31 des Profilquerschnitts der Schenkel 1 7 bilden. An die Engstelle 31 schließen sich zweite ebenflächige Wandteile 33 an, die zueinander konvergierend verlau- fen und mit den ersten ebenflächigen Wandteilen 29 einen stumpfen Winkel einschließen, der wenig größer als ein rechter Winkel ist. Die Länge dieser zweiten ebenflächigen Wandteile 33 ist etwas geringer als die Länge der ersten ebenflächigen Wandteile 29, und an diese zweiten ebenflächigen Wandteile 33 schließen sich dritte ebenflächige Wandteile 35 an, die zu den Lötflächen 25 parallele Ebenen definieren und sich bis in die Nähe der Öffnung der Ausnehmung 15 erstrecken. An diese dritten ebenflächigen Wandteile 35 schließen sich wiederum vierte ebenflächige Wandteile 37 an, die sich zueinander leicht divergierend bis zur Öffnung der Ausnehmung 15 erstrecken. Die Verbindung der ersten ebenflächigen Wandteile 29 miteinander und mit den zweiten ebenflächigen Wandteilen 33 erfolgt jeweils über gewölbte Wandstellen 39 mit gleichem Krümmungsradius. Die Verbindung der zweiten ebenflächigen Wandteile 33 mit den dritten ebenflächigen Wandteilen 35 und dieser mit den vierten ebenflächigen Wandteilen 37 erfolgt ebenfalls über gewölbte Wandstellen 41, bei denen der Krümmungsradius jeweils das Doppelte des Krümmungsradius an den Wandstellen 39 beträgt. The recess 1 5, starting from its inner end portion 23, bounded by planar wall portions 29 which, diverging to each other and enclosing a right angle, extend into the vicinity of the respective soldering surface 25 and there a Profilengstelle 31 of the profile cross section of the legs 1 7 form. The constriction 31 is adjoined by second planar wall parts 33, which converge in a convergent manner and enclose an obtuse angle with the first planar wall parts 29, which angle is slightly larger than a right angle. The length of these second planar wall portions 33 is slightly smaller than the length of the first planar wall portions 29, and these third planar wall portions 33 are followed by third planar wall portions 35 defining planes parallel to the soldering surfaces 25 and extending into the vicinity of the opening the recess 15 extend. At this third planar wall portions 35 in turn close fourth planar wall portions 37 which extend slightly divergent to the opening of the recess 15 to each other. The connection of the first planar wall portions 29 with each other and with the second planar wall portions 33 takes place in each case via curved wall portions 39 with the same radius of curvature. The connection of the second planar wall portions 33 with the third planar wall portions 35 and this with the fourth planar wall portions 37 also takes place over curved wall portions 41, in which the radius of curvature is twice the radius of curvature at the wall portions 39.
Die erfindungsgemäß vorgesehene Querschnittsform der Ausnehmung 1 5 resultiert in einer wirksamen Verringerung der betrieblichen Spannungsspit- zen und der Gefahr einer Rissbildung an den Lötstellen. Bei dem Durchstrom des Kühlmittels durch die Ausnehmung 15 bi lden die Engstellen 31 am Schenkel profil den Ort des steilsten Temperaturgradienten. Gleichzeitig ist dies auch der Ort des geringsten Materialquerschnitts, so dass thermische Verformungen auf entsprechend begrenzte Materialpartien beschränkt sind. Da von den Engstellen 31 ausgehend sich die Profildicke der Schenkel 1 7 zur Öffnung hin auf eine Profildicke vergrößert, die etwa dem Doppelten an den Engstellen 31 entspricht, ergibt sich eine optimale Spannungsverteilung über den Bereich der Lötflächen 25. The inventively provided cross-sectional shape of the recess 1 5 results in an effective reduction of operational voltage peaks and the risk of cracking at the solder joints. In the passage of the coolant through the recess 15 bi lden the bottlenecks 31st on the thigh profile the location of the steepest temperature gradient. At the same time, this is also the location of the smallest material cross-section, so that thermal deformations are limited to correspondingly limited material parts. Since the profile thickness of the legs 1 7, starting from the constrictions 31, increases towards the opening to a profile thickness which corresponds approximately to twice the constrictions 31, an optimum stress distribution over the area of the soldering surfaces 25 results.
Die erfindungsgemäße Wärmetauschereinrichtung braucht auf das Gebiet der Fluidkühlung nicht eingeschränkt zu sein, sondern kann auch allgemein für die Kühlung gasförmiger Medien eingesetzt werden und hier insbesondere auch Ladeluftkühler (Dieselmotoren), sowie Nach- und Zwischenkühler (Kompressoren) mit einbeziehen. Die Temperaturdifferenzen (Kühlluft zu Medium) bei den dahingehenden Anwendungen l iegen vergleichsweise noch wesentlich höher als vorstehend beschrieben. The heat exchanger device according to the invention need not be limited to the field of fluid cooling, but can also be used generally for the cooling of gaseous media and here in particular intercooler (diesel engines), as well as secondary and intercooler (compressors) to include. The temperature differences (cooling air to medium) in the pertinent applications are comparatively much higher than described above.

Claims

P a t e n t a n s p r ü c h e Wärmetauscher, insbesondere für Fluidkühlvorrichtungen, mit einem Paket aus planparallelen Platten (1 ), wobei zwischen Paaren übereinan- derl legender Platten (1 ) im Wechsel Durchströmbereiche (3, 5) für ein heißes Medium und für ein Kühlmedium gebildet sind, die jeweils durch die Platten (1 ) auf Abstand haltende Profil leisten (7, 1 1 ) seitlich begrenzt sind, die an den Platten (1) anliegende Lötflächen (25) bilden, wobei sich die Profilleisten (7, 1 1 ) an den Durchströmbereichen (3, 5) des einen Mediums und des anderen Mediums entlang von im Winkel aneinanderstoßender Ränder der Platten (1) erstrecken und wobei zumindest die Profilleisten (1 1 ) der Durchströmbereiche (5) des Kühlmediums einen Grundkörper (13), zwei sich von diesem entlang der Lötflächen (25) erstreckende Schenkel (1 7) sowie zwischen diesen eine zum angrenzenden Durchströmbereich (5) offene Ausnehmung (1 5) aufweisen, dadurch gekennzeichnet, dass die Ausnehmung (1 5) zumindest in dem an ihren inneren Endabschnitt (23) angrenzenden Bereich von ebenflächigen Wandteilen (29) begrenzt ist. P atentanspr che heat exchanger, in particular for fluid cooling devices, with a package of plane-parallel plates (1), wherein between pairs übereinander-laying plates (1) alternately Durchströmbereiche (3, 5) are formed for a hot medium and for a cooling medium, the each by the plates (1) at a distance holding profile afford (7, 1 1) are bounded laterally, which form on the plates (1) adjacent solder surfaces (25), wherein the profile strips (7, 1 1) at the Durchströmbereichen (3, 5) of the one medium and the other medium along at an angle abutting edges of the plates (1) and at least the profile strips (1 1) of the flow areas (5) of the cooling medium, a base body (13), two of this Having along the solder surfaces (25) extending legs (1 7) and between these one to the adjacent flow area (5) open recess (1 5), characterized in that the recess (1 5) is delimited at least in the region of planar wall parts (29) adjoining its inner end section (23).
Wärmetauscher nach Anspruch 1 , dadurch gekennzeichnet, dass die Ausnehmung (1 5), ausgehend von ihrem inneren Endabschnitt (23), divergierende erste ebenflächige Wandteile (29), die sich zu Engstellen (31 ) des Querschnittes der Schenkel (1 7) erstrecken, sich an die Engstellen (31) anschließende, konvergierende zweite ebenflächige Wandteile (33) sowie sich daran anschließende dritte ebenflächige Wandteile (35) aufweist, die sich, zu den Lötflächen (25) parallel, in die Nähe der Öffnung der Ausnehmung (15) erstrecken. Heat exchanger according to claim 1, characterized in that the recess (1 5), starting from its inner end portion (23), diverging first planar wall portions (29) extending to narrow points (31) of the cross section of the legs (1 7), has at the bottlenecks (31) subsequent, converging second planar wall portions (33) and adjoining third planar wall portions (35) extending parallel to the solder surfaces (25) in the vicinity of the opening of the recess (15) ,
Wärmetauscher nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sich an die dritten ebenflächigen Wandteile (35) vierte ebenflächige Wandteite (37) anschließen, die zueinander leicht divergierend bis zur Öffnung der Ausnehmung (1 5) verlaufen. Heat exchanger according to claim 1 or 2, characterized in that on the third planar wall parts (35) fourth planar Connect wall (37), the slightly divergent to each other to the opening of the recess (1 5) extend.
Wärmetauscher nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die ersten ebenflächigen Wandteile (29) zueinander senkrechte Ebenen bilden. Heat exchanger according to one of the preceding claims, characterized in that the first planar wall parts (29) form mutually perpendicular planes.
Wärmetauscher nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die zweiten ebenflächigen Wandteile (33) mit den ersten ebenflächigen Wandteilen (29) einen stumpfen Winkel einschließen. Heat exchanger according to one of the preceding claims, characterized in that the second planar wall parts (33) with the first planar wall parts (29) form an obtuse angle.
Wärmetauscher nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die ersten ebenflächigen Wandteile (29) miteinander und diese mit den zweiten ebenflächigen Wandteilen (33) jeweils über gewölbte Wandstellen (39) mit gleichem, ersten Krümmungsradius verbunden sind. Heat exchanger according to one of the preceding claims, characterized in that the first planar wall portions (29) with each other and these with the second planar wall portions (33) are each connected via curved wall locations (39) with the same first radius of curvature.
Wärmetauscher nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die zweiten ebenflächigen Wandteile (33) mit den dritten ebenflächigen Wandteilen (35) und diese mit den vierten ebenflächigen Wandteilen (37) jeweils über gewölbte Wandstellen (41) mit gleichem, zweiten Krümmungsradius verbunden sind, der das Doppelte des ersten Krümmungsradius beträgt. Heat exchanger according to one of the preceding claims, characterized in that the second planar wall portions (33) are connected to the third planar wall portions (35) and these with the fourth planar wall portions (37) each over curved wall locations (41) with the same, second radius of curvature which is twice the first radius of curvature.
Wärmetauscher nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Dicke des Querschnittes der Schenkel (1 7) im Bereich der dritten ebenflächigen Wandteile (35) in etwa das Doppelte der Dicke an den Engstellen (31 ) beträgt. Heat exchanger according to one of the preceding claims, characterized in that the thickness of the cross section of the legs (1 7) in the region of the third planar wall portions (35) is approximately twice the thickness at the bottlenecks (31).
EP11757177.8A 2010-09-29 2011-09-09 Heat exchanger Not-in-force EP2622299B1 (en)

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DE102010046913A DE102010046913A1 (en) 2010-09-29 2010-09-29 heat exchangers
US12/923,905 US8579021B2 (en) 2010-09-29 2010-10-13 Heat exchanger
PCT/EP2011/004545 WO2012052093A2 (en) 2010-09-29 2011-09-09 Heat exchanger

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CN103097848A (en) 2013-05-08
US8579021B2 (en) 2013-11-12
WO2012052093A2 (en) 2012-04-26
US20120073793A1 (en) 2012-03-29

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