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EP3106823A1 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
EP3106823A1
EP3106823A1 EP16168940.1A EP16168940A EP3106823A1 EP 3106823 A1 EP3106823 A1 EP 3106823A1 EP 16168940 A EP16168940 A EP 16168940A EP 3106823 A1 EP3106823 A1 EP 3106823A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
passage
wave
soldering
flat tube
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
EP16168940.1A
Other languages
German (de)
French (fr)
Other versions
EP3106823B1 (en
Inventor
Harald Bronner
Walter Demuth
Jochen HÄUSSERMANN
Volker Kurz
Eberhard Pantow
Jens Ruckwied
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.)
Mahle International GmbH
Original Assignee
Mahle International 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 Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP3106823A1 publication Critical patent/EP3106823A1/en
Application granted granted Critical
Publication of EP3106823B1 publication Critical patent/EP3106823B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • F28F9/0224—Header boxes formed by sealing end plates into covers
    • 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
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0131—Auxiliary supports for elements for tubes or tube-assemblies formed by plates
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
    • 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
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
    • 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
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
    • F28F9/182—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding the heat-exchange conduits having ends with a particular shape, e.g. deformed; the heat-exchange conduits or end plates having supplementary joining means, e.g. abutments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
    • F28D2021/0091—Radiators
    • F28D2021/0094—Radiators for recooling the engine coolant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2225/00—Reinforcing means
    • F28F2225/04—Reinforcing means for conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/04—Fastening; Joining by brazing

Definitions

  • the present invention relates to a heat exchanger with a heat exchanger block with flat tubes, which are each held longitudinally in a passage of an associated tube plate, according to the preamble of claim 1.
  • the invention also relates to a motor vehicle equipped with such a heat exchanger.
  • a heat exchanger for exchanging heat between a first fluid and a second fluid which has a block for the separate and heat-transmitting guidance of the first and second fluids.
  • the heat exchanger block comprises flat tubes, which are held with their longitudinal end sides in passages of tube sheets.
  • the passages have at least one, from one to Rohrachsraum substantially vertical plane, curved away and in distance from the said plane extending boundary contour, wherein a distance value at least at a transition between the pipe narrow side and the pipe broadside is so less than a distance value on the tube broadside, the stresses in the region of the transition can be reduced.
  • the durability of the heat exchanger should be able to be increased.
  • the present invention therefore deals with the problem of providing a heat exchanger of the generic type an improved or at least one alternative embodiment, which is characterized in particular in thin-walled flat tubes with at least one partition by an increased fatigue strength in the partition wall area.
  • the present invention is based on the general idea of forming at least one longitudinal side, preferably both longitudinal sides, of the passage in the region of a soldering surface between a flat tube and a passage in a tubesheet, for example by means of corresponding straps or the introduction of depressions, which later becomes between the solder surface resulting at least one longitudinal side of the passage and the flat tube has a soldering edge or a soldering edge with a wave-shaped course, wherein a high point of the wave-shaped course of the soldering line coincides with a partition wall, in particular with a fold, of the respective flat tube, whereby a significantly increased Thermal shock resistance can be achieved, which has been confirmed for example by FEM calculations.
  • the heat exchanger according to the invention has for this purpose in a known manner to a heat exchanger block with flat tubes, which are each held along the longitudinal end in a passage of the associated tube sheet.
  • Each passage has two opposite and substantially straight longitudinal sides and two opposite narrow sides.
  • each flat tube is soldered to the long sides and the narrow sides of the passage.
  • at least one solder joint between at least one of the longitudinal sides of at least one passage and a flat tube arranged therein has a wave-shaped soldering boundary, which may be formed, for example, by wave-shaped recesses which, in the case of flat tubes soldered in the passages, have an equally undulating course of the soldering limit in this area, that is along the associated longitudinal side, generate.
  • the wave-shaped soldering boundary which of course has high points and low points, is now aligned with the at least one partition wall of the flat tube such that the soldering limit in the region of the at least one partition, in particular of the at least one fold, is a high point and thus, in particular, a free edge of the passage has reduced width.
  • a significant reduction in voltage in the partition wall area can be achieved, which corresponds to a significant life extension under temperature load.
  • a significantly increased temperature resistance of the heat exchanger can be achieved by the inventive design of at least one of the longitudinal sides of a passage with the resulting wavy Lötgrenze and the alignment of the high points of the wave soldering border on the partition wall of the flat tube.
  • the wave-shaped soldering boundary runs at a distance from a free edge of the passage. Overall, this results in a soldered surface, which terminates at the top rectangular to the free edge of the passage and down by means of the wave-shaped Along the solder boundary or the soldering edge, which not only a large-scale and thus reliable soldering can be created, but also by the special inventive wave-shaped course of the soldering line with the arrangement of a high point in the region of at least one partition, in particular of at least one fold of the flat tube an extremely temperature resistant. It is preferably provided that the wave-shaped solder limit has a number of partitions corresponding number of high points.
  • the soldering limit in the area of the high point and / or the low point has two flanks angled away at an angle ⁇ of 7 ° ⁇ ⁇ ⁇ 30 ° to a horizontal. Depending on the selected angle, a flatter or steeper course of the soldering limit can be achieved in conjunction with the wavelength.
  • the soldering boundary between the high point and the low point has a height difference h of 1.5 mm ⁇ h ⁇ 2.5 mm.
  • the wave-shaped soldering limit has a wavelength I of 4.0 mm ⁇ I ⁇ 26.0 mm. This range already suggests that, in particular for heat exchangers of different sizes, the wavelength I of the wave-shaped soldering limit can be easily adapted to the respective size of the flat tube or the passage.
  • the wave-shaped soldering boundary goes over a high point in the narrow side of the Passage over.
  • the narrow side can be arranged at right angles to the two longitudinal sides, or else be formed semicircular, with a higher voltage pickup is possible by going over the undulating solder border over a high point in the narrow side. Since, in particular, these corner regions are exposed to high stresses under a temperature load, the service life of the heat exchanger according to the invention can likewise be prolonged as a result.
  • a heat exchanger 1 according to the invention, which may be used for example as a coolant radiator in a motor vehicle 2, a heat exchanger block 3 with flat tubes 4, each longitudinally in a passage 5 (see also Fig. 2 to 4 ) of an associated tube plate 6 are held.
  • Each passage 5 has two opposite and substantially straight longitudinal sides 7 and two also opposite narrow sides 8, the latter may be formed, for example, semicircular.
  • Each of the flat tubes 4 is soldered over a part of its outer surface with the longitudinal sides 7 and the narrow sides 8 of an associated passage 5.
  • At least one of the longitudinal sides 7 of at least one passage 5 wave-shaped depressions 11, for example in the form of notches, which in soldered in the associated passage 5 flat tube 4 has a soldering surface with a wave soldering edge 12 and a wave-shaped soldering edge 12th result (cf. Fig. 1 to 4 ).
  • the wave-shaped solder border 12 can also by correspondingly shaped tabs 21 (see. Fig. 5 ) be formed.
  • solder can be applied to the passage 5 as well as to the ends of the flat tubes 4 as well as to both be, for example, by a Lotplattmaschine.
  • the at least one flat tube 4 has at least one partition wall 10, wherein the soldering boundary 12 in the region of the at least one partition wall 10 has a high point 13 and thus a reduced width b to a free edge 15 of the passage 5.
  • a line / plane 20 running through two opposite groove bottoms 19, 19 'of the tube bottom 6 can be used as reference, so that in this case the soldering boundary 12 in the region of the at least one partition 10 has a high point 13 and thus a to an extending through two opposite groove bases 19,19 'of the tube sheet 6 extending line / plane 20 increased width c.
  • both longitudinal sides 7 of the at least one passage 5 have the wave-shaped soldering boundaries 12 and / or the wave-shaped depressions 11.
  • the soldering limit 12 is in the Fig. 2 to 4 not immediately presented, but their position indicated.
  • the partition wall 10 may be formed as a fold 9, in particular if the flat tube 4 is formed as a folded flat tube 4.
  • the flat tube 4 may be formed as a welded bar tube or extruded tube, that is to say extruded flat tube 4.
  • a partition wall 10 can thus also be a web or produced by extrusion during extrusion together with the flat tube 4.
  • the wave-shaped edge of the recesses 11 may have a regularly repeating course in terms of amplitude and / or wavelength.
  • the wavy edge of the recesses 11 may have a mathematically unsteady course.
  • the wave-shaped soldering edge 12 or the wave-shaped depressions 11 are arranged in the exemplary embodiment on an insertion side 17 of the longitudinal side 7 of the passage 5 of the tube bottom 6.
  • the respective insertion sides 17 of the passages 5 are facing away from a collecting box 18 of the heat exchanger 1 (cf. Fig. 1 ) and thus facing a longitudinal pipe center of the arranged in the passage 5 flat tube 4.
  • FEM calculations have shown with the geometries described that a means of the inventively designed and with respect to the fold 9 and the partition 10 aligned course of the solder boundary 12 means a significant reduction in voltage and thus a significant life extension under temperature load.
  • Another great advantage of the wave-shaped solder border 12, formed by, for example, the depressions 11 or indentations, lies in the simple insertion of the flat tubes 4 into the passages 5 without the risk of tilting.
  • the wave-shaped depressions 11 can also form an insertion bevel, in particular also in the region of the low points 14, which facilitates the insertion of the flat tube 4 into the associated passage 5.
  • the wave-shaped solder border 12 extends at a distance from the free edge 15 of the passage 5. It thus limits with the free edge 15 a soldering surface whose width b is reduced in particular in the region of the fold 9 or the partitions 10.
  • the high point 13 also has a width c extended to a line / plane 20 running through two opposite groove bottoms 19, 19 'of the tube bottom 6 (cf. Fig. 3 to 6 ).
  • the free edge 15 may be formed in a straight line, or also has a slightly curved course, as for example according to the Fig. 4 is shown. According to the Fig.
  • the wavy edge of the wave-shaped depressions 11 also has a high point 13 in this first section.
  • the free edge 15 also extends slightly in a corner region at the transition to the narrow side 8.
  • the wave-shaped edge of the wave-shaped depressions 11 has a high point 13. while there is a course of the wave-shaped edge of the wave-shaped depressions 11 with a low point 14 between these two sections.
  • solder limit 12 which runs along the wave-shaped edge of the wave-shaped depressions 11, according to the 3 and 4 , it can be seen that this has in the region of the high point 13 and / or the low point 14 two to the horizontal and in each case by an angle ⁇ of 7 ° ⁇ ⁇ ⁇ 30 ° angled flanks 16, 16 '.
  • the soldering limit 12 itself may in all embodiments between the high point 13 and the low point 14 have a height difference h of 1.5 mm ⁇ h ⁇ 2.5 mm, and a wavelength I of 4.0 ⁇ I ⁇ 26 mm.
  • the wave-shaped solder border 12 passes over a high point 13 in the narrow side 8 of the passage 5. As a result, a reduction of the stress in the rounded transition region between the longitudinal side 7 on the one hand and the narrow side 8 on the other hand is possible.
  • the wave-shaped soldering boundary 12 is the edge of the wave-shaped section of the soldering surface, in particular of the tabs 21, but without an area beyond the soldering border 12 or soldering surface, in particular without adjacent recesses.
  • a plateau 22 forming, soldering boundary portion 23 is provided in the region of at least one high point 13 of the soldering boundary 12 a straight.
  • This plateau 22 has a length a 1 .
  • the length a 1 is preferably between 2 and 3 mm.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

Die vorliegende Erfindung betrifft einen Wärmeübertrager (1) mit einem Wärmeübertragerblock (3) mit Flachrohren (4), die jeweils längsendseitig in einem Durchzug (5) eines zugehörigen Rohrbodens (6) gehalten sind, wobei jeder Durchzug (5) zwei sich gegenüberliegende und im Wesentlichen gerade Längsseiten (7) und zwei sich gegenüberliegende Schmalseiten (8) aufweist, und wobei jedes Flachrohr (4) mit den Längsseiten (7) und den Schmalseiten (8) des Durchzuges (5) verlötet ist. Erfindungswesentlich ist dabei, - dass eine Lötverbindung zwischen zumindest einer der Längsseiten (7) zumindest eines Durchzuges (5) und einem darin angeordneten Flachrohr (4) eine wellenförmige Lötgrenze (12) aufweist, - dass zumindest ein Flachrohr (4) zumindest eine Trennwand (10) aufweist, - dass die Lötgrenze (12) im Bereich der zumindest einen Trennwand (10) einen Hochpunkt (13) und damit eine zu einer durch zwei gegenüberliegende Nutengründe (19,19') des Rohrbodens (6) verlaufende Linie (20) vergrößerte Breite c aufweist.The present invention relates to a heat exchanger (1) with a heat exchanger block (3) with flat tubes (4), each longitudinally in a passage (5) of an associated tube plate (6) are held, each passage (5) two opposing and in the Has substantially straight longitudinal sides (7) and two opposite narrow sides (8), and wherein each flat tube (4) with the longitudinal sides (7) and the narrow sides (8) of the passage (5) is soldered. Essential to the invention is a solder connection between at least one of the longitudinal sides (7) of at least one passage (5) and a flat tube (4) arranged therein has a wavy soldering limit (12), - That at least one flat tube (4) has at least one partition (10), - That the soldering boundary (12) in the region of the at least one partition wall (10) has a high point (13) and thus to a by two opposite grooves (19,19 ') of the tube bottom (6) extending line (20) increased width c ,

Description

Die vorliegende Erfindung betrifft einen Wärmeübertrager mit einem Wärmeübertragerblock mit Flachrohren, die jeweils längsendseitig in einem Durchzug eines zugehörigen Rohrbodens gehalten sind, gemäß dem Oberbegriff des Anspruchs 1. Die Erfindung betrifft außerdem ein mit einem solchen Wärmeübertrager ausgestattetes Kraftfahrzeug.The present invention relates to a heat exchanger with a heat exchanger block with flat tubes, which are each held longitudinally in a passage of an associated tube plate, according to the preamble of claim 1. The invention also relates to a motor vehicle equipped with such a heat exchanger.

Aus der DE 10 2013 208 424 A1 ist ein gattungsgemäßer Wärmeübertrager, insbesondere für ein Kraftfahrzeug, bekannt, mit einem Wärmeübertragerblock mit Flachrohren, die jeweils längsendseitig in einem Durchzug eines zugehörigen Rohrbodens gehalten sind. Jeder Durchzug weist dabei zwei sich gegenüberliegende und im Wesentlichen gerade Längsseiten sowie zwei sich gegenüberliegende Schmalseiten auf, wobei jedes Flachrohr mit den Längsseiten und den Schmalseiten des Durchzuges verlötet ist. Zwischen der Längsseite und der Schmalseite ist dabei eine Berandung eines Durchzugseckbereichs ausgebildet. Die Berandung des Durchzugseckbereichs weist einen geraden Verlauf zu einer von der Längsseite aufgespannten Basisebene auf oder ist oberhalb der von der Längsseite aufgespannten Basisebene gewölbt zur Basisebene hinlaufend ausgebildet. Hierdurch soll eine Rohr-Boden-Verbindung geschaffen werden können, welche Kräfte, die in Folge von Temperaturänderungen und mechanischer Beanspruchung auftreten, besser aufnehmen kann.From the DE 10 2013 208 424 A1 is a generic heat exchanger, in particular for a motor vehicle, known, with a heat exchanger block with flat tubes, which are each held along the end in a passage of an associated tube sheet. Each passage has two opposite and substantially straight longitudinal sides and two opposite narrow sides, wherein each flat tube is soldered to the longitudinal sides and the narrow sides of the passage. Between the longitudinal side and the narrow side a boundary of a Durchzugseckbereichs is formed. The boundary of the Durchzugseckbereichs has a straight course to a base plane spanned by the longitudinal side or is curved over the base plane spanned from the longitudinal side of the base plane formed to the base plane. As a result, a pipe-ground connection is to be created, which can absorb better forces that occur as a result of temperature changes and mechanical stress.

Aus der DE 10 2007 059 673 A1 ist ein Wärmeübertrager zum Wärmetausch zwischen einem ersten Fluid und einem zweiten Fluid bekannt, der einen Block zur voneinander getrennten und wärmeübertragenden Führung des ersten und zweiten Fluides aufweist. Der Wärmeübertragerblock umfasst dabei Flachrohre, die mit ihren Längsendseiten in Durchzügen von Rohrböden gehalten sind. Die Durchzüge weisen dabei mindestens eine, von einer zur Rohrachsrichtung im Wesentlichen senkrechten Ebene, weg gewölbte und in Abstand zu der genannten Ebene verlaufende Begrenzungskontur auf, wobei ein Abstandswert wenigstens an einem Übergang zwischen der Rohrschmalseite und der Rohrbreitseite derart geringer ist als ein Abstandswert an der Rohrbreitseite, das Spannungen im Bereich des Übergangs verringert werden können. Hierdurch soll insbesondere die Dauerhaltbarkeit des Wärmeübertragers gesteigert werden können.From the DE 10 2007 059 673 A1 For example, a heat exchanger for exchanging heat between a first fluid and a second fluid is known, which has a block for the separate and heat-transmitting guidance of the first and second fluids. The heat exchanger block comprises flat tubes, which are held with their longitudinal end sides in passages of tube sheets. The passages have at least one, from one to Rohrachsrichtung substantially vertical plane, curved away and in distance from the said plane extending boundary contour, wherein a distance value at least at a transition between the pipe narrow side and the pipe broadside is so less than a distance value on the tube broadside, the stresses in the region of the transition can be reduced. As a result, in particular the durability of the heat exchanger should be able to be increased.

Generell erhält durch die Reduzierung der Rohrwandstärken die Temperaturwechselbelastung bei Kraftfahrzeugkühlmittelkühlern einen immer größeren Stellenwert.In general, by reducing the pipe wall thicknesses, the thermal cycling in automotive coolant coolers is becoming increasingly important.

Die vorliegende Erfindung beschäftigt sich daher mit dem Problem, für einen Wärmeübertrager der gattungsgemäßen Art eine verbesserte oder zumindest eine alternative Ausführungsform anzugeben, die sich insbesondere auch bei dünnwandigen Flachrohren mit zumindest einer Trennwand durch eine gesteigerte Dauerfestigkeit in dem Trennwandbereich auszeichnet.The present invention therefore deals with the problem of providing a heat exchanger of the generic type an improved or at least one alternative embodiment, which is characterized in particular in thin-walled flat tubes with at least one partition by an increased fatigue strength in the partition wall area.

Dieses Problem wird erfindungsgemäß durch den Gegenstand des unabhängigen Anspruchs 1 gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject of the dependent claims.

Die vorliegende Erfindung beruht auf dem allgemeinen Gedanken, im Bereich einer Lötfläche zwischen einem Flachrohr und einem Durchzug in einem Rohrboden zumindest eine Längsseite, vorzugsweise beide Längsseiten, des Durchzuges so auszubilden, beispielsweise durch entsprechende Laschen oder das Einbringen von Vertiefungen, dass eine sich später zwischen der zumindest einen Längsseite des Durchzuges und dem Flachrohr ergebende Lötfläche eine Lötgrenze bzw. einen Lötrand mit einem wellenförmigen Verlauf aufweist, wobei ein Hochpunkt des wellenförmigen Verlaufes der Lötgrenze mit einer Trennwand, insbesondere mit einem Falz, des jeweiligen Flachrohres zusammen fällt, wodurch eine deutlich erhöhte Temperaturwechselfestigkeit erreicht werden kann, was sich beispielsweise durch FEM-Rechnungen bestätigt hat. Der erfindungsgemäße Wärmeübertrager weist hierzu in bekannter Weise einen Wärmeübertragerblock mit Flachrohren auf, die jeweils längsendseitig in einem Durchzug des zugehörigen Rohrbodens gehalten sind. Jeder Durchzug weist dabei zwei sich gegenüberliegende und im Wesentlichen gerade Längsseiten sowie zwei sich gegenüberliegende Schmalseiten auf. Darüber hinaus ist jedes Flachrohr mit den Längsseiten und den Schmalseiten des Durchzuges verlötet. Erfindungsgemäß weist nun zumindest eine Lötverbindung zwischen zumindest einer der Längsseiten zumindest eines Durchzuges und einem darin angeordneten Flachrohr eine wellenförmige Lötgrenze aufweist, die beispielsweise durch wellenförmige Vertiefungen gebildet sein kann, die bei in den Durchzügen verlöteten Flachrohren einen ebenso wellenförmigen Verlauf der Lötgrenze in diesem Bereich, das heißt entlang der zugehörigen Längsseite, erzeugen. Die wellenförmige Lötgrenze, welche selbstredend Hochpunkte und Tiefpunkte aufweist, ist nun derart zu der zumindest einen Trennwand des Flachrohres ausgerichtet, dass die Lötgrenze im Bereich der zumindest einen Trennwand, insbesondere des zumindest einen Falzes, einen Hochpunkt und damit insbesondere eine zum freien Rand des Durchzuges hin reduzierte Breite aufweist. Hierdurch kann eine deutliche Spannungsreduzierung im Trennwandbereich erreicht werden, was einer erheblichen Lebensdauerverlängerung unter Temperaturlast entspricht. Insgesamt kann durch die erfindungsgemäße Ausgestaltung zumindest einer der Längsseiten eines Durchzuges mit der hieraus resultierenden wellenförmigen Lötgrenze und die Ausrichtung der Hochpunkte der wellenförmigen Lötgrenze auf die Trennwand des Flachrohres eine deutlich gesteigerte Temperaturbeständigkeit des Wärmeübertragers erreicht werden.The present invention is based on the general idea of forming at least one longitudinal side, preferably both longitudinal sides, of the passage in the region of a soldering surface between a flat tube and a passage in a tubesheet, for example by means of corresponding straps or the introduction of depressions, which later becomes between the solder surface resulting at least one longitudinal side of the passage and the flat tube has a soldering edge or a soldering edge with a wave-shaped course, wherein a high point of the wave-shaped course of the soldering line coincides with a partition wall, in particular with a fold, of the respective flat tube, whereby a significantly increased Thermal shock resistance can be achieved, which has been confirmed for example by FEM calculations. The heat exchanger according to the invention has for this purpose in a known manner to a heat exchanger block with flat tubes, which are each held along the longitudinal end in a passage of the associated tube sheet. Each passage has two opposite and substantially straight longitudinal sides and two opposite narrow sides. In addition, each flat tube is soldered to the long sides and the narrow sides of the passage. According to the invention, at least one solder joint between at least one of the longitudinal sides of at least one passage and a flat tube arranged therein has a wave-shaped soldering boundary, which may be formed, for example, by wave-shaped recesses which, in the case of flat tubes soldered in the passages, have an equally undulating course of the soldering limit in this area, that is along the associated longitudinal side, generate. The wave-shaped soldering boundary, which of course has high points and low points, is now aligned with the at least one partition wall of the flat tube such that the soldering limit in the region of the at least one partition, in particular of the at least one fold, is a high point and thus, in particular, a free edge of the passage has reduced width. In this way, a significant reduction in voltage in the partition wall area can be achieved, which corresponds to a significant life extension under temperature load. Overall, a significantly increased temperature resistance of the heat exchanger can be achieved by the inventive design of at least one of the longitudinal sides of a passage with the resulting wavy Lötgrenze and the alignment of the high points of the wave soldering border on the partition wall of the flat tube.

Bei einer vorteilhaften Weiterbildung der erfindungsgemäßen Lösung verläuft die wellenförmige Lötgrenze beabstandet zu einem freien Rand des Durchzuges. Insgesamt ergibt sich somit eine verlötete Fläche, die nach oben hin rechteckförmig zum freien Rand des Durchzuges abschließt und nach unten mittels des wellenförmigen Verlaufs der Lötgrenze bzw. dem Lötrand, wodurch nicht nur eine großflächige und damit zuverlässige Verlötung geschaffen werden kann, sondern durch den speziellen erfindungsgemäßen wellenförmigen Verlauf der Lötgrenze mit Anordnung eines Hochpunktes im Bereich der zumindest einen Trennwand, insbesondere des zumindest einen Falzes, des Flachrohres auch eine äußerst temperaturbelastungsbeständige. Dabei ist vorzugsweise vorgesehen, dass die wellenförmige Lötgrenze eine der Anzahl der Trennwände entsprechende Anzahl an Hochpunkten aufweist.In an advantageous development of the solution according to the invention, the wave-shaped soldering boundary runs at a distance from a free edge of the passage. Overall, this results in a soldered surface, which terminates at the top rectangular to the free edge of the passage and down by means of the wave-shaped Along the solder boundary or the soldering edge, which not only a large-scale and thus reliable soldering can be created, but also by the special inventive wave-shaped course of the soldering line with the arrangement of a high point in the region of at least one partition, in particular of at least one fold of the flat tube an extremely temperature resistant. It is preferably provided that the wave-shaped solder limit has a number of partitions corresponding number of high points.

Bei einer vorteilhaften Weiterbildung der erfindungsgemäßen Lösung weist die Lötgrenze im Bereich des Hochpunktes und/oder des Tiefpunktes zwei um jeweils einen Winkel α von 7° ≤ α ≤ 30° zu einer Horizontalen abgewinkelte Flanken auf. Je nach gewähltem Winkel kann dabei in Zusammenschau mit der Wellenlänge ein flacherer bzw. steilerer Verlauf der Lötgrenze erreicht werden.In an advantageous further development of the solution according to the invention, the soldering limit in the area of the high point and / or the low point has two flanks angled away at an angle α of 7 ° ≦ α ≦ 30 ° to a horizontal. Depending on the selected angle, a flatter or steeper course of the soldering limit can be achieved in conjunction with the wavelength.

Bei einer vorteilhaften Weiterbildung der erfindungsgemäßen Lösung weist die Lötgrenze zwischen dem Hochpunkt und dem Tiefpunkt eine Höhendifferenz h von 1,5 mm < h < 2,5 mm auf. Durch die Bestimmung bzw. Festlegung der Amplitude des wellenförmigen Verlaufes der Lötgrenze, welche der halben Höhe entspricht, kann ebenfalls Einfluss auf die Dauerfestigkeit genommen werden.In an advantageous development of the solution according to the invention, the soldering boundary between the high point and the low point has a height difference h of 1.5 mm <h <2.5 mm. By determining or determining the amplitude of the wave-shaped curve of the soldering limit, which corresponds to half the height, influence on the fatigue strength can also be taken.

Bei einer weiteren vorteilhaften Ausführungsform der erfindungsgemäßen Lösung weist die wellenförmige Lötgrenze eine Wellenlänge I von 4,0 mm ≤ I ≤ 26,0 mm auf. Dieser Bereich lässt bereits erahnen, dass insbesondere für unterschiedlich große Wärmeübertrager die Wellenlänge I der wellenförmigen Lötgrenze einfach an die jeweilige Größe des Flachrohres bzw. des Durchzuges adaptiert werden kann.In a further advantageous embodiment of the solution according to the invention, the wave-shaped soldering limit has a wavelength I of 4.0 mm ≦ I ≦ 26.0 mm. This range already suggests that, in particular for heat exchangers of different sizes, the wavelength I of the wave-shaped soldering limit can be easily adapted to the respective size of the flat tube or the passage.

Bei einer weiteren vorteilhaften Ausführungsform der erfindungsgemäßen Lösung geht die wellenförmige Lötgrenze über einen Hochpunkt in die Schmalseite des Durchzuges über. Die Schmalseite kann dabei rechtwinklig zu den beiden Längsseiten angeordnet sein, oder aber auch halbkreisförmig ausgebildet sein, wobei durch das Übergehen der wellenförmigen Lötgrenze über einen Hochpunkt in die Schmalseite eine höhere Spannungsaufnahme möglich ist. Da insbesondere diese Eckbereiche bei einer Temperaturbelastung hohen Spannungen ausgesetzt sind, kann hierdurch ebenfalls die Lebensdauer des erfindungsgemäßen Wärmeübertragers verlängert werden.In a further advantageous embodiment of the solution according to the invention, the wave-shaped soldering boundary goes over a high point in the narrow side of the Passage over. The narrow side can be arranged at right angles to the two longitudinal sides, or else be formed semicircular, with a higher voltage pickup is possible by going over the undulating solder border over a high point in the narrow side. Since, in particular, these corner regions are exposed to high stresses under a temperature load, the service life of the heat exchanger according to the invention can likewise be prolonged as a result.

Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Komponenten beziehen.Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Dabei zeigen, jeweils schematisch,

Fig. 1
eine teilweise geschnittene Ansicht durch einen erfindungsgemäßen Wärmeübertrager,
Fig. 2
eine Schnittdarstellung durch einen Rohrboden des erfindungsgemäßen Wärmeübertragers im Bereich eines Durchzuges,
Fig. 3
eine Darstellung wie in Fig. 2, mit flach verlaufenden Lötflanken für ein Flachrohr mit einem Falz und zwei Stegen,
Fig. 4
eine Darstellung wie in Fig. 3, jedoch für ein Flachrohr mit einem Falz,
Fig. 5
eine Darstellung wie in Fig. 3, jedoch mit einem zum Wärmeübertragerblock gerichteten freien Rand des Durchzuges,
Fig. 6
eine Schnittdarstellung durch einen Rohrboden des erfindungsgemäßen Wärmeübertragers im Bereich eines Durchzuges mit einem Plateau an einem Hochpunkt der Lötgrenze.
Show, in each case schematically,
Fig. 1
a partially sectioned view through a heat exchanger according to the invention,
Fig. 2
a sectional view through a tube plate of the heat exchanger according to the invention in the region of a passage,
Fig. 3
a representation like in Fig. 2 , with flat flanks for a flat tube with a fold and two webs,
Fig. 4
a representation like in Fig. 3 but for a flat tube with a fold,
Fig. 5
a representation like in Fig. 3 but with a free edge of the passage facing the heat exchanger block,
Fig. 6
a sectional view through a tube sheet of the heat exchanger according to the invention in the region of a passage with a plateau at a high point of the solder limit.

Entsprechend der Fig. 1, weist ein erfindungsgemäßer Wärmeübertrager 1, der beispielsweise als Kühlmittelkühler in einem Kraftfahrzeug 2 eingesetzt sein kann, einen Wärmeübertragerblock 3 mit Flachrohren 4 auf, die jeweils längsendseitig in einem Durchzug 5 (vgl. auch die Fig. 2 bis 4) eines zugehörigen Rohrbodens 6 gehalten sind. Jeder Durchzug 5 besitzt dabei zwei sich gegenüberliegende und im Wesentlichen gerade Längsseiten 7 sowie zwei sich ebenfalls gegenüberliegende Schmalseiten 8, wobei letztere beispielsweise halbkreisförmig ausgebildet sein können. Jedes der Flachrohre 4 ist dabei über einen Teil seiner Außenfläche mit den Längsseiten 7 und den Schmalseiten 8 eines zugehörigen Durchzuges 5 verlötet. Gemäß einem Aspekt der Erfindung weist zumindest eine der Längsseiten 7 zumindest eines Durchzuges 5 wellenförmige Vertiefungen 11, beispielsweise in Form von Einkerbungen, auf, die bei in dem zugehörigen Durchzug 5 verlötetem Flachrohr 4 eine Lötfläche mit einer wellenförmigen Lötgrenze 12 bzw. einem wellenförmigen Lötrand 12 ergeben (vgl. Fig. 1 bis 4). Alternativ dazu kann die wellenförmige Lötgrenze 12 auch durch entsprechend geformte Laschen 21 (vgl. Fig. 5) gebildet sein. Zur Herstellung der Lötverbindung bzw. einer gefügten Lotfläche oder einer gefügten Lotschicht, kann Lot sowohl am Durchzug 5 als auch auf Enden der Flachrohre 4 als auch auf beiden aufgebracht sein, bspw. durch eine Lotplattierung. Das zumindest ein Flachrohr 4 weist zumindest eine Trennwand 10 aufweist, wobei die Lötgrenze 12 im Bereich der zumindest einen Trennwand 10 einen Hochpunkt 13 und damit eine zu einem freien Rand 15 des Durchzuges 5 reduzierte Breite b aufweist. Sollte der freie Rand 15 keine Linie/Gerade aufweisen, so kann als Bezug auch eine durch zwei gegenüberliegende Nutengründe 19,19' des Rohrbodens 6 verlaufende Linie/Ebene 20 herangezogen werden, so dass in diesem Fall die Lötgrenze 12 im Bereich der zumindest einen Trennwand 10 einen Hochpunkt 13 und damit eine zu einer durch zwei gegenüberliegende Nutengründe 19,19' des Rohrbodens 6 verlaufende Linie/Ebene 20 vergrößerte Breite c aufweist. Selbstverständlich ist auch denkbar, dass beide Längsseiten 7 des zumindest einen Durchzuges 5 die wellenförmigen Lötgrenzen 12 und/oder die wellenförmigen Vertiefungen 11 aufweisen.According to the Fig. 1 , has a heat exchanger 1 according to the invention, which may be used for example as a coolant radiator in a motor vehicle 2, a heat exchanger block 3 with flat tubes 4, each longitudinally in a passage 5 (see also Fig. 2 to 4 ) of an associated tube plate 6 are held. Each passage 5 has two opposite and substantially straight longitudinal sides 7 and two also opposite narrow sides 8, the latter may be formed, for example, semicircular. Each of the flat tubes 4 is soldered over a part of its outer surface with the longitudinal sides 7 and the narrow sides 8 of an associated passage 5. According to one aspect of the invention, at least one of the longitudinal sides 7 of at least one passage 5 wave-shaped depressions 11, for example in the form of notches, which in soldered in the associated passage 5 flat tube 4 has a soldering surface with a wave soldering edge 12 and a wave-shaped soldering edge 12th result (cf. Fig. 1 to 4 ). Alternatively, the wave-shaped solder border 12 can also by correspondingly shaped tabs 21 (see. Fig. 5 ) be formed. To produce the soldered connection or a joined soldering surface or a bonded solder layer, solder can be applied to the passage 5 as well as to the ends of the flat tubes 4 as well as to both be, for example, by a Lotplattierung. The at least one flat tube 4 has at least one partition wall 10, wherein the soldering boundary 12 in the region of the at least one partition wall 10 has a high point 13 and thus a reduced width b to a free edge 15 of the passage 5. If the free edge 15 has no line / straight line, a line / plane 20 running through two opposite groove bottoms 19, 19 'of the tube bottom 6 can be used as reference, so that in this case the soldering boundary 12 in the region of the at least one partition 10 has a high point 13 and thus a to an extending through two opposite groove bases 19,19 'of the tube sheet 6 extending line / plane 20 increased width c. Of course, it is also conceivable that both longitudinal sides 7 of the at least one passage 5 have the wave-shaped soldering boundaries 12 and / or the wave-shaped depressions 11.

Die Lötgrenze 12 ist dabei in den Fig. 2 bis 4 nicht unmittelbar dargestellt, jedoch ihre Position aufgezeigt. Die Trennwand 10 kann dabei als Falz 9 ausgebildet sein, insbesondere sofern das Flachrohr 4 als gefalztes Flachrohr 4 ausgebildet ist. Alternativ kann das Flachrohr 4 als ein geschweißtes Stegrohr oder Strangpressrohr, das heißt extrudiertes Flachrohr 4, ausgebildet sein. Eine Trennwand 10 kann somit auch ein Steg sein oder beim Extrudieren zusammen mit dem Flachrohr 4 durch Extrudieren hergestellt werden. Der wellenförmige Rand der Vertiefungen 11 kann einen sich regelmäßig wiederholenden Verlauf in Bezug auf Amplitude und/oder Wellenlänge aufweisen. Außerdem kann der wellenförmige Rand der Vertiefungen 11 einen mathematisch unstetigen Verlauf haben.The soldering limit 12 is in the Fig. 2 to 4 not immediately presented, but their position indicated. The partition wall 10 may be formed as a fold 9, in particular if the flat tube 4 is formed as a folded flat tube 4. Alternatively, the flat tube 4 may be formed as a welded bar tube or extruded tube, that is to say extruded flat tube 4. A partition wall 10 can thus also be a web or produced by extrusion during extrusion together with the flat tube 4. The wave-shaped edge of the recesses 11 may have a regularly repeating course in terms of amplitude and / or wavelength. In addition, the wavy edge of the recesses 11 may have a mathematically unsteady course.

Die wellenförmige Lötgrenze 12 bzw. die wellenförmigen Vertiefungen 11 sind im Ausführungsbeispiel an einer Einführseite 17 der Längsseite 7 des Durchzuges 5 des Rohrbodens 6 angeordnet. Die jeweiligen Einführseiten 17 der Durchzüge 5 sind einem Sammelkasten 18 des Wärmeübertragers 1 abgewandt (vgl. Fig. 1) und damit einer längsseitigen Rohrmitte des in dem Durchzug 5 angeordneten Flachrohres 4 zugewandt.The wave-shaped soldering edge 12 or the wave-shaped depressions 11 are arranged in the exemplary embodiment on an insertion side 17 of the longitudinal side 7 of the passage 5 of the tube bottom 6. The respective insertion sides 17 of the passages 5 are facing away from a collecting box 18 of the heat exchanger 1 (cf. Fig. 1 ) and thus facing a longitudinal pipe center of the arranged in the passage 5 flat tube 4.

Der wellenförmige Verlauf der Lötgrenze 12 und insbesondere die deckungsgleiche Anordnung der Hochpunkte 13 der Lötgrenze 12 mit den Trennwänden 10 bzw. dem Falz 9 führen zu einer deutlichen Reduzierung der Spannungen in diesem Bereich unter Temperaturbelastung, wodurch eine deutlich erhöhte Temperaturwechselfestigkeit des Wärmeübertragers 1 erzielt werden kann. FEM-Berechnungen haben dabei mit den beschriebenen Geometrien gezeigt, dass eine mittels des erfindungsgemäß ausgebildeten und in Bezug auf den Falz 9 bzw. die Trennwand 10 ausgerichteten Verlaufs der Lötgrenze 12 eine deutliche Spannungsreduzierung und somit eine erhebliche Lebensdauerverlängerung unter Temperaturlast bedeutet. Ein weiterer großer Vorteil der wellenförmigen Lötgrenze 12, gebildet durch beispielsweise die Vertiefungen 11 bzw. Einkerbungen liegt in dem einfachen Einführen der Flachrohre 4 in die Durchzüge 5, ohne dass hierbei die Gefahr des Verkantens besteht. Dabei können die wellenförmigen Vertiefungen 11 zugleich eine Einführschräge bilden, insbesondere auch im Bereich der Tiefpunkte 14, die das Einführen des Flachrohrs 4 in den zugehörigen Durchzug 5 erleichtert.The wave-shaped course of the soldering boundary 12 and in particular the congruent arrangement of the high points 13 of the soldering boundary 12 with the partitions 10 and the fold 9 lead to a significant reduction of the stresses in this area under temperature load, whereby a significantly increased thermal shock resistance of the heat exchanger 1 can be achieved , FEM calculations have shown with the geometries described that a means of the inventively designed and with respect to the fold 9 and the partition 10 aligned course of the solder boundary 12 means a significant reduction in voltage and thus a significant life extension under temperature load. Another great advantage of the wave-shaped solder border 12, formed by, for example, the depressions 11 or indentations, lies in the simple insertion of the flat tubes 4 into the passages 5 without the risk of tilting. In this case, the wave-shaped depressions 11 can also form an insertion bevel, in particular also in the region of the low points 14, which facilitates the insertion of the flat tube 4 into the associated passage 5.

Betrachtet man die Fig. 2 bis 6, so kann man erkennen, dass die wellenförmige Lötgrenze 12 beabstandet zum freien Rand 15 des Durchzuges 5 verläuft. Sie begrenzt somit mit dem freien Rand 15 eine Lötfläche, deren Breite b insbesondere im Bereich des Falzes 9 bzw. der Trennwände 10 reduziert ist. In diesem Bereich weist der Hochpunkt 13 auch eine zu einer durch zwei gegenüberliegende Nutengründe 19,19' des Rohrbodens 6 verlaufende Linie/Ebene 20 vergrößerte Breite c auf (vgl. Fig. 3 bis 6). Dabei ist selbstverständlich klar, dass der freie Rand 15 geradlinig ausgebildet sein kann, oder aber ebenfalls einen leicht geschwungen Verlauf besitzt, wie dies beispielsweise gemäß der Fig. 4 dargestellt ist. Gemäß der Fig. 4 ist dabei der freie Rand 15 im Bereich des Falzes 9 leicht abgesenkt. Der wellenförmige Rand der wellenförmigen Vertiefungen 11 besitzt in diesem ersten Abschnitt einen Hochpunkt 13. Ebenfalls leicht abgesenkt verläuft der freie Rand 15 in einem Eckbereich am Übergang zur Schmalseite 8. In diesem zweiten Abschnitt weist der wellenförmige Rand der wellenförmigen Vertiefungen 11 einen Hochpunkt 13 auf, während sich zwischen diesen beiden Abschnitten ein Verlauf des wellenförmigen Rands der wellenförmigen Vertiefungen 11 mit einem Tiefpunkt 14 befindet. Durch diese Anordnung kann die Spannungsbelastung des Wärmeübertragers 1 reduziert werden.Looking at the Fig. 2 to 6 , it can be seen that the wave-shaped solder border 12 extends at a distance from the free edge 15 of the passage 5. It thus limits with the free edge 15 a soldering surface whose width b is reduced in particular in the region of the fold 9 or the partitions 10. In this area, the high point 13 also has a width c extended to a line / plane 20 running through two opposite groove bottoms 19, 19 'of the tube bottom 6 (cf. Fig. 3 to 6 ). It is understood, of course, that the free edge 15 may be formed in a straight line, or also has a slightly curved course, as for example according to the Fig. 4 is shown. According to the Fig. 4 is the case free edge 15 in the region of the fold 9 slightly lowered. The wavy edge of the wave-shaped depressions 11 also has a high point 13 in this first section. The free edge 15 also extends slightly in a corner region at the transition to the narrow side 8. In this second section, the wave-shaped edge of the wave-shaped depressions 11 has a high point 13. while there is a course of the wave-shaped edge of the wave-shaped depressions 11 with a low point 14 between these two sections. By this arrangement, the stress of the heat exchanger 1 can be reduced.

Betrachtet man die Lötgrenze 12, die entlang des wellenförmigen Randes der wellenförmigen Vertiefungen 11 verläuft, gemäß den Fig. 3 und 4, so kann man erkennen, dass diese im Bereich des Hochpunktes 13 und/oder des Tiefpunktes 14 zwei zur Horizontalen und jeweils um einen Winkel α von 7° ≤ α ≤ 30° abgewinkelte Flanken 16, 16' aufweist. Die Lötgrenze 12 selbst kann bei allen Ausführungsformen zwischen dem Hochpunkt 13 und dem Tiefpunkt 14 eine Höhendifferenz h von 1,5 mm ≤ h ≤ 2,5 mm aufweisen, sowie eine Wellenlänge I von 4,0 ≤ I ≤ 26 mm. Betrachtet man nochmals die Fig. 3 bis 6, so kann man erkennen, dass die wellenförmige Lötgrenze 12 über einen Hochpunkt 13 in die Schmalseite 8 des Durchzuges 5 übergeht. Hierdurch ist auch eine Reduzierung der Spannungsbelastung in dem ausgerundeten Übergangsbereich zwischen Längsseite 7 einerseits und Schmalseite 8 andererseits möglich.Considering the solder limit 12, which runs along the wave-shaped edge of the wave-shaped depressions 11, according to the 3 and 4 , it can be seen that this has in the region of the high point 13 and / or the low point 14 two to the horizontal and in each case by an angle α of 7 ° ≤ α ≤ 30 ° angled flanks 16, 16 '. The soldering limit 12 itself may in all embodiments between the high point 13 and the low point 14 have a height difference h of 1.5 mm ≤ h ≤ 2.5 mm, and a wavelength I of 4.0 ≤ I ≤ 26 mm. Looking again at the Fig. 3 to 6 , it can be seen that the wave-shaped solder border 12 passes over a high point 13 in the narrow side 8 of the passage 5. As a result, a reduction of the stress in the rounded transition region between the longitudinal side 7 on the one hand and the narrow side 8 on the other hand is possible.

Betrachtet man den Wärmeübertrager 1 gemäß der Fig. 5, so kann man erkennen, dass dieser im Wesentlichen dem Wärmeübertrager 1 gemäß der Fig. 2 entspricht, jedoch einen zum Wärmeübertragerblock 3 hin gerichteten Rand aufweist. Die wellenförmige Lötgrenze 12 ist hier der Rand des wellenförmigen Abschnitts der Lötfläche, insbesondere der Laschen 21, jedoch ohne einen über die Lötgrenze 12 bzw. Lötfläche hinaus angrenzenden Flächenbereich, insbesondere ohne angrenzende Vertiefungen.Considering the heat exchanger 1 according to the Fig. 5 , it can be seen that this substantially the heat exchanger 1 according to the Fig. 2 corresponds, but has a heat exchanger block 3 directed towards the edge. In this case, the wave-shaped soldering boundary 12 is the edge of the wave-shaped section of the soldering surface, in particular of the tabs 21, but without an area beyond the soldering border 12 or soldering surface, in particular without adjacent recesses.

In Fig. 6 ist gezeigt, dass im Bereich zumindest eines Hochpunktes 13 der Lötgrenze 12 ein gerader, ein Plateau 22 bildender, Lötgrenzenabschnitt 23 vorgesehen ist. Dieses Plateau 22 hat eine Länge a1. In analoger Weise könnte selbstverständlich auch im Bereich zumindest eines Tiefpunktes 14 der Lötgrenze 12 ein gerader, ein Plateau 22 bildender, Lötgrenzenabschnitt 23 vorgesehen sein, was in Fig. 6 mit unterbrochen gezeichneter Linie dargestellt ist. Die Länge a1 beträgt dabei vorzugsweise zwischen 2 und 3 mm. Die Vorteile ergeben sich mit einem in der Höhe niedrigeren Raumbedarf, wenn die Hochpunkte 13 abgeflacht werden können.In Fig. 6 It is shown that in the region of at least one high point 13 of the soldering boundary 12 a straight, a plateau 22 forming, soldering boundary portion 23 is provided. This plateau 22 has a length a 1 . In an analogous manner, it would of course also be possible in the region of at least one low point 14 of the soldering boundary 12 to provide a straight, a plateau 22-forming, soldering boundary section 23, which is described in US Pat Fig. 6 is shown with broken line drawn. The length a 1 is preferably between 2 and 3 mm. The advantages arise with a lower in height space requirements when the high points 13 can be flattened.

Mit dem erfindungsgemäßen Wärmeübertrager 1 und insbesondere dem erfindungsgemäß ausgebildeten Rohrboden 6 kann eine deutlich reduzierte Spannungsbelastung bei Wärmeübertragern 1 mit Flachrohren 4 erreicht werden.With the heat exchanger 1 according to the invention and in particular the tube plate 6 designed according to the invention, a significantly reduced stress load can be achieved with heat exchangers 1 with flat tubes 4.

Claims (14)

Wärmeübertrager (1) mit einem Wärmeübertragerblock (3) mit Flachrohren (4), die jeweils längsendseitig in einem Durchzug (5) eines zugehörigen Rohrbodens (6) gehalten sind, wobei jeder Durchzug (5) zwei sich gegenüberliegende und im Wesentlichen gerade Längsseiten (7) und zwei sich gegenüberliegende Schmalseiten (8) aufweist, und wobei jedes Flachrohr (4) mit den Längsseiten (7) und den Schmalseiten (8) des Durchzuges (5) verlötet ist, dadurch gekennzeichnet, - dass eine Lötverbindung zwischen zumindest einer der Längsseiten (7) zumindest eines Durchzuges (5) und einem darin angeordneten Flachrohr (4) eine wellenförmige Lötgrenze (12) aufweist, - dass zumindest ein Flachrohr (4) zumindest eine Trennwand (10) aufweist, - dass die Lötgrenze (12) im Bereich der zumindest einen Trennwand (10) einen Hochpunkt (13) und damit eine zu einer durch zwei gegenüberliegende Nutengründe (19,19') des Rohrbodens (6) verlaufende Linie/Ebene (20) vergrößerte Breite c aufweist. Heat exchanger (1) with a heat exchanger block (3) with flat tubes (4), each longitudinally held in a passage (5) of an associated tube plate (6), wherein each passage (5) has two opposite and substantially straight longitudinal sides (7 ) and two opposite narrow sides (8), and wherein each flat tube (4) with the longitudinal sides (7) and the narrow sides (8) of the passage (5) is soldered, characterized - that a soldered connection between at least one of the longitudinal sides (7) comprises at least one of the rim hole (5) and disposed therein a flat tube (4) has a wavy Lötgrenze (12) - That at least one flat tube (4) has at least one partition (10), - That the soldering limit (12) in the region of the at least one partition wall (10) has a high point (13) and thus to a by two opposite grooves bottoms (19,19 ') of the tube sheet (6) extending line / plane (20) increased width c. Wärmeübertrager nach Anspruch 1,
dadurch gekennzeichnet,
dass zumindest eine der Längsseiten (7) zumindest eines Durchzuges (5) wellenförmige Vertiefungen (11) aufweist, wobei deren wellenförmiger Rand die entsprechende wellenförmige Lötgrenze (12) der Lötverbindung zwischen dem zumindest einen Durchzug (5) und dem darin angeordneten Flachrohr (4) bildet.Heat exchanger according to claim 1,
characterized,
in that at least one of the longitudinal sides (7) of at least one passage (5) has wave-shaped recesses (11), the wave-shaped edge of which is the corresponding wave-shaped soldering limit (12) of the solder connection between the at least one passage (5) and the flat tube (4) arranged therein. forms. Wärmeübertrager nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass die wellenförmige Lötgrenze (12) beabstandet zu einem freien Rand (15) des Durchzuges (5) verläuft.Heat exchanger according to claim 1 or 2,
characterized,
in that the wavy soldering limit (12) extends at a distance from a free edge (15) of the passage (5). Wärmeübertrager nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
dass die Lötgrenze (12) im Bereich des Hochpunktes (13) und/oder eines Tiefpunktes (14) zwei zur Horizontalen um einen Winkel α von 7° ≤ α ≤ 30° abgewinkelte Flanken (16,16') aufweist.Heat exchanger according to one of the preceding claims,
characterized,
in that the soldering limit (12) in the region of the high point (13) and / or a low point (14) has two flanks (16, 16 ') angled away from the horizontal at an angle α of 7 ° ≤ α ≤ 30 °. Wärmeübertrager nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, - dass zumindest ein Flachrohr (4) als gefalztes Flachrohr (4) und die zumindest eine Trennwand (10) als Falz (9) ausgebildet sind, oder - dass zumindest ein Flachrohr (4) als geschweißtes Flachrohr (4) ausgebildet ist, oder - dass zumindest ein Flachrohr (4) extrudiertes Flachrohr (4) ausgebildet. Heat exchanger according to one of the preceding claims,
characterized, - That at least one flat tube (4) as a folded flat tube (4) and the at least one partition wall (10) as a fold (9) are formed, or - That at least one flat tube (4) is formed as a welded flat tube (4), or - That at least one flat tube (4) formed extruded flat tube (4). Wärmeübertrager nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
dass die Lötgrenze (12) zwischen dem Hochpunkt (13) und dem Tiefpunkt (14) eine Höhendifferenz h von 1,5 mm ≤ h ≤ 2,5 mm aufweist.Heat exchanger according to one of the preceding claims,
characterized,
that the Lötgrenze (12) between the high point (13) and the low point (14) a difference in height h of 1.5 mm ≤ h ≤ 2.5 mm. Wärmeübertrager nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
dass die wellenförmige Lötgrenze (12) eine Wellenlänge I von 4,0 mm ≤ I ≤ 26,0 mm aufweist.Heat exchanger according to one of the preceding claims,
characterized,
in that the wave soldering limit (12) has a wavelength I of 4.0 mm ≦ I ≦ 26.0 mm. Wärmeübertrager nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
dass die wellenförmige Lötgrenze (12) über einen Hochpunkt (13) in die Schmalseite (8) des Durchzuges (5) übergeht.Heat exchanger according to one of the preceding claims,
characterized,
that the wave-shaped soldering limit (12) passes over a high point (13) in the narrow side (8) of the passage (5). Wärmeübertrager nach einem der Ansprüche 2 bis 8,
dadurch gekennzeichnet,
dass die wellenförmige Lötgrenze (12) oder die wellenförmigen Vertiefungen (11) und die wellenförmige Lötgrenze (12) an einer Einführseite (17) für das Flachrohr (4) an zumindest einer Längsseite (7) des Durchzuges (5) des Rohrbodens (6) angeordnet sind, wobei die jeweilige Einführseite (17) des Durchzuges (5) der längsseitigen Rohrmitte des in dem Durchzug (5) angeordneten Flachrohres (4) zugewandt ist.Heat exchanger according to one of claims 2 to 8,
characterized,
in that the wavy soldering limit (12) or the wave-shaped depressions (11) and the wave-shaped soldering border (12) on an insertion side (17) for the flat tube (4) on at least one longitudinal side (7) of the passage (5) of the tube bottom (6). are arranged, wherein the respective insertion side (17) of the passage (5) of the longitudinal pipe center of the in the passage (5) arranged flat tube (4) faces. Wärmeübertrager nach einem der Ansprüche 2 bis 9,
dadurch gekennzeichnet,
dass beide Längsseiten (7) des zumindest einen Durchzuges (5) die wellenförmigen Lötgrenzen (12) und/oder die wellenförmigen Vertiefungen (11) aufweisen.Heat exchanger according to one of claims 2 to 9,
characterized,
that both longitudinal sides (7) of the at least one passage (5) have the wave-shaped soldering boundaries (12) and / or the wave-shaped depressions (11). Wärmeübertrager nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
dass die wellenförmige Lötgrenze (12) eine der Anzahl der Trennwände (10) entsprechende Anzahl an Hochpunkten (13) aufweist.Heat exchanger according to one of the preceding claims,
characterized,
that the wave-shaped Lötgrenze (12) to the number of partitions (10) having corresponding number of high points (13). Wärmeübertrager nach einem der Ansprüche 2 bis 11,
dadurch gekennzeichnet,
dass die wellenförmigen Vertiefungen (11) eine Einführschräge bilden.Heat exchanger according to one of claims 2 to 11,
characterized,
that the wave-shaped depressions (11) form an insertion bevel. Wärmeübertrager nach einem der Ansprüche 1 bis 12,
dadurch gekennzeichnet,
dass im Bereich zumindest eines Hochpunktes (13) der Lötgrenze (12) ein gerader, ein Plateau (22) bildender, Lötgrenzenabschnitt (23) vorgesehen ist.Heat exchanger according to one of claims 1 to 12,
characterized,
in that in the region of at least one high point (13) of the soldering boundary (12) there is provided a straight, a plateau (22) forming, soldering boundary section (23). Kraftfahrzeug (2) mit zumindest einem Wärmeübertrager (1) nach einem der vorhergehenden Ansprüche.Motor vehicle (2) with at least one heat exchanger (1) according to one of the preceding claims.
EP16168940.1A 2015-05-19 2016-05-10 Heat exchanger Active EP3106823B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015209130.9A DE102015209130A1 (en) 2015-05-19 2015-05-19 Heat exchanger

Publications (2)

Publication Number Publication Date
EP3106823A1 true EP3106823A1 (en) 2016-12-21
EP3106823B1 EP3106823B1 (en) 2018-07-18

Family

ID=55970836

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Country Link
US (1) US11002494B2 (en)
EP (1) EP3106823B1 (en)
DE (1) DE102015209130A1 (en)

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Also Published As

Publication number Publication date
US20160341494A1 (en) 2016-11-24
US11002494B2 (en) 2021-05-11
DE102015209130A1 (en) 2016-11-24
EP3106823B1 (en) 2018-07-18

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