EP1445570B1 - Heat exchanger tube with corrugated insert and manufacturing method therefore - Google Patents

Heat exchanger tube with corrugated insert and manufacturing method therefore Download PDF

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Publication number
EP1445570B1
EP1445570B1 EP04000378.2A EP04000378A EP1445570B1 EP 1445570 B1 EP1445570 B1 EP 1445570B1 EP 04000378 A EP04000378 A EP 04000378A EP 1445570 B1 EP1445570 B1 EP 1445570B1
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EP
European Patent Office
Prior art keywords
wave
heat exchanger
exchanger tube
section
insert
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.)
Revoked
Application number
EP04000378.2A
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German (de)
French (fr)
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EP1445570A2 (en
EP1445570A3 (en
Inventor
Rob J. Dipl.-Ing. Sagasser
Jens Dipl.-Ing. Blütling
Rainer Käsinger
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Modine Manufacturing Co
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Modine Manufacturing Co
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Publication of EP1445570A3 publication Critical patent/EP1445570A3/en
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/04—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
    • F28D9/005—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another the plates having openings therein for both heat-exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/916—Oil cooler

Definitions

  • the invention relates to a heat exchanger tube with a corrugated t having the features of the preamble of claims 1 and 3 respectively. Moreover, the invention relates to a manufacturing method for corrugated use.
  • the object of the invention is to provide a corrugated insert which can be produced with the least possible effort and with which an optimized ratio of the cooling capacity to the pressure loss in a heat exchanger is possible.
  • the troughs have about twice the length of the wave crests.
  • a larger wavelength of the insert leads to a lower pressure loss.
  • the terms "wave troughs” and “wave crests” are interchangeable because they depend on the viewer's point of view.
  • the one-piece insert is formed of different wavelengths. For example, at the beginning of the insert there may be a portion of lesser wavelength followed by a middle portion of longer wavelength, which in turn merges into an end portion of lesser wavelength. This order can also be changed as needed.
  • Each section preferably consists of several waves of equal length.
  • the feed rate or feed of the strip material be changed accordingly to provide portions of greater or lesser wavelength (pitch).
  • a smaller wavelength is realized by a lower feed rate or a smaller feed and a larger wavelength consequently by a higher feed rate or a larger feed. Accordingly, no or at least only minor changes to the punching tool or other expenditures are required for the production of such inserts.
  • Only the speed of the tape feed or alternatively the continuous stroke speed of the press or the size of the feed must be pre-programmed accordingly to obtain the desired formation of the insert. Larger or smaller feeds can be realized by changing the angular positions of the eccentric shaft of the press, between which the feed can take place.
  • the insert is designed in such a way that the optimal or desired ratio of the cooling capacity to the pressure loss is achieved for the respective application.
  • the methods according to the invention consist, in other words, of exploiting the known technical possibilities of the forming machine specifically for the production of inserts for heat exchanger tubes in order to form them with shorter and / or longer wavelengths so that they fulfill certain requirements with regard to the heat exchange can.
  • an insert can be made, for example, has a portion of any length, in which no waves are present, or only a single long drawn wave, which is thus flat.
  • Such a section is preceded by at least one section of waves, and at least one section of waves adjoins the non-waved section.
  • Such configurations of corrugated inserts are desired in some cases because they may, for example, avoid the use of multiple individual inserts.
  • FIGS. 1 and 2 show photographic images of a known insert and an insert according to the invention.
  • FIG. 3 is a schematic representation of a known use and the FIGS. 4 and 5 are inserts, but according to the present invention.
  • the Fig. 6 shows a non-inventive view of the end of a flat tube and the Fig. 7 shows an insert which has been produced by a further method according to the invention.
  • the heat exchanger tube can be designed as desired.
  • the heat exchanger tube of the embodiment is on the EP 742 418 B1 and there especially on the Fig. 7 directed.
  • the heat exchanger tube for example, consists of two tube shells which are nested, being soldered tight at its edge, but their heat exchange surfaces are spaced and limit the space in which the insert is located.
  • the heat exchanger tube has at least one inlet opening 7 and an outlet opening 8, which in the Fig. 5 are designated.
  • the oil flows through the heat exchanger tube and is in heat exchange with the flowed through by the cooling liquid upper and lower heat exchanger tube, as is known from the above Fig. 7 the EP's clearly visible.
  • inventions 1 and 2 Illustrated with "invention" images provided that the wave troughs 2 have a greater length than the wave crests 2.
  • the wavelength 4 often referred to as pitch was increased compared to the prior art.
  • the length of the wave troughs 2 is about twice as long as the length of the wave crests 1. It can be understood that thereby the pressure loss can be reduced, because the oil and / or the cooling liquid on the way from the inlet opening 7 to the outlet opening 8 less waves or breakthroughs 5 has to overcome than in a use according to the prior art.
  • the insert is an insert made on a press in a punching tool.
  • the preparation is made of an "endless" strip material, preferably of aluminum, which is very well known in the prior art and therefore not shown in a figure.
  • the metal strip is down from the so-called coil with a certain low but constant over the entire use feed rate and transported through the punch to a use according to Fig. 3 or to produce according to the prior art.
  • the feed rate is in the production of the in Fig. 4 shown use also constant but higher than in the prior art according to Fig. 3 ,
  • this insert has an approximately twice the wavelength 4 than the one after Fig. 3 ,
  • the feed rate is changed at intervals. First, the initial section A1 is produced at a constant but reduced speed. Then, at a constant but increased feed speed or with increased feed, the center portion A2 is made to immediately reduce the speed or the feed back to the value of the initial portion A1 to produce the end portion A3 .
  • the speed amounts or feeds can be determined by tests. In general, a higher speed or a larger feed leads to longer wavelengths and vice versa, reduced speed to smaller wavelengths.
  • the continuous stroke speed of the press is varied.
  • the section A1 with a Treasurehub horridas of 240 strokes / min. can be made, the following section A2, which has larger wavelengths 4 , can be realized with 200 strokes / min and the end section A3 can again be realized with 240 strokes / min.
  • the variation of the feed rate or the advance of the aluminum strip is preferable because a frequent change of the Treasurehub Anthony is at the expense of the mechanics of the press.
  • a press stroke consists of a 360 ° full circle rotation of the eccentric shaft of the press, the forming operation taking place in the area of the bottom dead center, that is to say in the region of 180 °.
  • the tape feed takes place, for example, within an angular position of the eccentric shaft between 320 ° and 40 °, ie within an 80 ° - Winkelweges, for the passage (above the top dead center) depending on the set Treasurehub Anthony a certain period is assigned, within the same feed can be done.
  • the tape feed takes place, for example, within a 100 ° - Winkelweges, so for example between 310 ° and 50 °, which allows a longer period for the same Mamahub Ukrainian, within the same even at the same feed rate a longer way or a longer Feed is completed, the longer wavelengths 4 results.
  • the limits of the angular positions within which the feed is executable may vary from case to case. These hang among other things from the diameter of the eccentric shaft and from the depth of engagement of the upper tool in the lower tool. If this depth is small and the diameter is large, correspondingly broader limits can be envisaged. However, a larger angular path (radians) than 180 °, ie between 270 ° and 90 °, seems rarely feasible. Maximized feed rates are achievable if, in addition to the extension of the angular travel, the feed rate is simultaneously increased.
  • the heat exchanger tube according to the Fig. 6 is a welded, soldered or drawn flat tube 11, as might occur, for example, in air-cooled intercoolers. Also in such heat exchanger tubes 11 is an insert. It is pure coincidence that there the waveform of the insert from the Fig. 5 has been provided, because the training of the use depends on the specific application. Also the use of the Fig. 6 may have openings 5 , but it can also be formed without openings 5 , for example, the charge air flows perpendicular to the image plane through the flat tube 11. In other words, the direction of flow 10 and lying in the image plane wave direction 9 are perpendicular to each other, which is why Fig. 6 not part of this invention.
  • an insert is shown in principle which has a central section A2 without waves, but which in the present context is regarded as a section A2 with a single elongated shaft.
  • a section A2 is produced in that the Treasurehub congress the eccentric press is interrupted with advancing feed.
  • Such inserts are preferably not intended for mass production due to the mentioned interruption of Treasurehub ceremoniess.
  • the initial section A1 and the end section A3 may consist of a plurality of waves of equal wavelength 4 , it being understood that it is also possible here to vary such that different wavelengths 4 are present within the start section A1 and / or the end section A3 . Therefore, in the end section A3 , waves of different wavelengths 4 were provided merely by way of example.
  • the length of the sections A1, A2, A3 can be chosen freely and depends on the specific application of the use.

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

Description

Die Erfindung betrifft ein Wärmetaucherrohr mit einem gewellten Einsatzt, das die Merkmale des Oberbegriffes der Ansprüche 1 bzw. 3 aufweist. Darüber hinaus betrifft die Erfindung ein Herstellungsverfahren für den gewellten Einsatz.The invention relates to a heat exchanger tube with a corrugated Einsatzt having the features of the preamble of claims 1 and 3 respectively. Moreover, the invention relates to a manufacturing method for corrugated use.

Der Stand der Technik auf dem angesprochenen Gebiet zeichnet sich durch scheinbar grenzenlosen Variantenreichtum aus.The state of the art in the mentioned field is characterized by seemingly limitless variety wealth.

Beschränkt man sich auf einen gewellten Einsatz in ein Wärmetauscherrohr eines Ölkühlers, so kann beispielsweise auf das deutsche Gebrauchsmuster DE 296 22 191 oder auf das europäische Patent EP 742 418 B1 verwiesen werden, aus denen der beschriebene Einsatz hervorgeht. Solche Einsätze haben Durchbrüche in den Wellenflanken. Dort wurde darauf hingewiesen, dass die Einsätze eine für einen geringen Druckverlust des Öles günstige Anströmrichtung haben, die quer zur Wellenlaufrichtung liegt und eine ungünstige, die genau in der Wellenlaufrichtung liegt. Deshalb kann der Einsatz so in das Wärmetauscherrohr eingefügt werden, dass die Wellenlaufrichtung zur Anströmrichtung eine bestimmte Neigung aufweist, wodurch ein optimales Verhältnis der Kühlleistung zum Druckverlust erzielbar ist. Zur Umsetzung dieses Gedankens ist es jedoch notwendig, dass die Einsätze mit dem entsprechenden Neigungswinkel ausgestanzt werden, wodurch möglicherweise ein höherer Materialverschnitt anfällt.Limiting yourself to a corrugated insert in a heat exchanger tube of an oil cooler, so can for example on the German utility model DE 296 22 191 or to the European patent EP 742 418 B1 be referenced, showing the use described. Such inserts have breakthroughs in the corrugation flanks. There it was pointed out that the inserts have a flow direction which is favorable for a low pressure loss of the oil, which is transverse to the direction of shaft travel, and an unfavorable one which lies exactly in the direction of shaft travel. Therefore, the insert can be inserted into the heat exchanger tube so that the shaft running direction to the direction of flow has a certain inclination, whereby an optimal ratio of the cooling capacity to the pressure loss can be achieved. To implement this idea, however, it is necessary that the inserts are punched out with the appropriate angle of inclination, which may result in a higher material waste.

Da so etwas nicht gerne hingenommen wird, behilft man sich bezüglich der Erzielung des optimalen Verhältnisses der Kühlleistung zum Druckverlust oft damit, dass zwischen den Rändern des Wärmetauscherrohres und den Rändern des Einsatzes mehr oder weniger große Bypässe belassen werden. Diese haben jedoch Einfluss auf die gesamte Durchströmungscharakteristik des Wärmetauschers, und sie sind deshalb oft auch nicht die beste Lösung. In der US 2 344 588 hat man die erwähnten Bypässe dadurch geschaffen, dass zwischen den Wellenbergen bzw. Wellentälern und der Wand des Rohres ein Abstand bleibt, durch den ein Gas strömen kann.Since such a thing is not taken with pleasure, it is often made with respect to the achievement of the optimum ratio of cooling capacity to pressure loss so that between the edges of the heat exchanger tube and the edges of the insert more or less large bypasses are left. However, these have an influence on the overall flow characteristic of the heat exchanger, and they are therefore often not the best solution. In the US 2,344,588 one has created the bypasses mentioned by the fact that between the wave crests or troughs and the wall of the tube remains a distance through which a gas can flow.

In der CH 416 698 werden jeweils zwei gewellte Einsätze mit Durchbrüchen in den Wellenflanken in ein Wärmetauscherrohr eingesetzt. Die Wellenlaufrichtung liegt quer zur Anströmrichtung. Letzteres trifft auch auf die Wärmetauscher zu, die mit den Publikationsnummern JP 07-280 084 bzw. JP 09-273 883 veröffentlicht wurden.In the CH 416 698 in each case two corrugated inserts are used with openings in the wave flanks in a heat exchanger tube. The shaft running direction is transverse to the direction of flow. The latter also applies to the heat exchangers, with the publication numbers JP 07-280 084 respectively. JP 09-273 883 were published.

Die Aufgabe der Erfindung besteht darin, einen gewellten Einsatz zur Verfügung zu stellen, der mit geringstem Aufwand herstellbar ist und mit dem ein optimiertes Verhältnis der Kühlleistung zum Druckverlust in einem Wärmetauscher möglich ist.The object of the invention is to provide a corrugated insert which can be produced with the least possible effort and with which an optimized ratio of the cooling capacity to the pressure loss in a heat exchanger is possible.

Es soll ferner ein vorteilhaftes Herstellungsverfahren für den Einsatz angegeben werden.It should also be given an advantageous manufacturing method for use.

Die erfindungsgemäße Lösung wird bezüglich der Ausbildung des gewellten Einsatzes durch das Kennzeichen des Anspruchs 1 oder auch durch das Kennzeichen des Anspruchs 3 erreicht. Zwei erfindungsgemäße Herstellungsverfahren für den gewellten Einsatz sind Gegenstand der Ansprüche 6 und 7.The inventive solution is achieved with respect to the formation of the corrugated insert by the characterizing part of claim 1 or by the characterizing part of claim 3. Two production methods according to the invention for corrugated use are the subject matter of claims 6 and 7.

Es wird bevorzugt eine solche Teilung des wellenförmigen Einsatzes gewählt, dass die Wellentäler etwa die doppelte Länge der Wellenberge aufweisen. Eine größere Wellenlänge des Einsatzes führt zu einem geringeren Druckverlust. Die Begriffe "Wellentäler" und "Wellenberge" sind austauschbar, da sie vom Standpunkt des Betrachters abhängen.It is preferably selected such a division of the wave-shaped insert that the troughs have about twice the length of the wave crests. A larger wavelength of the insert leads to a lower pressure loss. The terms "wave troughs" and "wave crests" are interchangeable because they depend on the viewer's point of view.

Als weitere unabhängige Aufgabenlösung ist vorgesehen, dass der einstückige Einsatz aus unterschiedlichen Wellenlängen gebildet ist. Beispielsweise kann am Anfang des Einsatzes ein Abschnitt mit geringerer Wellenlänge vorhanden sein, an den sich ein Mittelabschnitt mit größerer Wellenlänge anschließt, der wiederum in einen Endabschnitt geringerer Wellenlänge übergeht. Diese Reihenfolge kann je nach Bedarf auch verändert sein. Jeder Abschnitt besteht vorzugsweise aus mehreren Wellen gleicher Länge.As a further independent task solution is provided that the one-piece insert is formed of different wavelengths. For example, at the beginning of the insert there may be a portion of lesser wavelength followed by a middle portion of longer wavelength, which in turn merges into an end portion of lesser wavelength. This order can also be changed as needed. Each section preferably consists of several waves of equal length.

Insbesondere ist bei einem auf einer Presse gestanzten Einsatz vorgesehen, dass die Vorschubgeschwindigkeit oder der Vorschub des Bandmaterials entsprechend verändert wird, um Abschnitte mit größerer bzw. kleinerer Wellenlänge (Teilung) zu schaffen. Eine kleinere Wellenlänge wird durch eine geringere Vorschubgeschwindigkeit oder einen kleineren Vorschub realisiert und eine größere Wellenlänge demzufolge durch eine höhere Vorschubgeschwindigkeit oder einen größeren Vorschub. Zur Herstellung solcher Einsätze sind demzufolge keinerlei oder zumindest lediglich geringfügige Änderungen am Stanzwerkzeug oder sonstige Aufwände erforderlich. Lediglich die Geschwindigkeit des Bandvorschubs oder alternativ die Dauerhubgeschwindigkeit der Presse oder die Größe des Vorschubs müssen entsprechend vorprogrammiert werden, um die gewünschte Ausbildung des Einsatzes zu erhalten. Größere oder kleinere Vorschübe lassen sich durch die Veränderung der Winkelstellungen der Exzenterwelle der Presse, zwischen denen der Vorschub erfolgen kann, realisieren.In particular, in an insert stamped on a press, it is provided that the feed rate or feed of the strip material be changed accordingly to provide portions of greater or lesser wavelength (pitch). A smaller wavelength is realized by a lower feed rate or a smaller feed and a larger wavelength consequently by a higher feed rate or a larger feed. Accordingly, no or at least only minor changes to the punching tool or other expenditures are required for the production of such inserts. Only the speed of the tape feed or alternatively the continuous stroke speed of the press or the size of the feed must be pre-programmed accordingly to obtain the desired formation of the insert. Larger or smaller feeds can be realized by changing the angular positions of the eccentric shaft of the press, between which the feed can take place.

Der Einsatz wird so ausgebildet, dass das für den jeweiligen Einsatzfall optimale bzw. gewünschte Verhältnis der Kühlleistung zum Druckverlust zustande kommt. Wegen weiterer Merkmale wird auf die Ansprüche hingewiesen.The insert is designed in such a way that the optimal or desired ratio of the cooling capacity to the pressure loss is achieved for the respective application. For further features, reference is made to the claims.

Die erfindungsgemäßen Verfahren bestehen, mit anderen Worten ausgedrückt, darin, die an sich bekannten technischen Möglichkeiten der Umformmaschine gezielt für die Herstellung von Einsätzen für Wärmetauscherrohre auszunutzen, um diese derart mit kürzeren und/oder längeren Wellenlängen auszubilden, dass sie bestimmte Anforderungen bezüglich des Wärmetausches erfüllen können.The methods according to the invention consist, in other words, of exploiting the known technical possibilities of the forming machine specifically for the production of inserts for heat exchanger tubes in order to form them with shorter and / or longer wavelengths so that they fulfill certain requirements with regard to the heat exchange can.

Als zusätzlicher Vorteil gegenüber dem Stand der Technik muss unbedingt darauf hingewiesen werden, dass eine nicht unerhebliche Materialeinsparung durch das Vorsehen größerer Wellenlängen im Einsatz auftritt.As an additional advantage over the prior art must necessarily be noted that a significant material savings by providing larger wavelengths in use occurs.

Gemäß dem unabhängigen Anspruch 7 ist vorgesehen, dass der Dauerhubbetrieb der Presse vorübergehend unterbrochen wird, wobei der Vorschub weiter in Betrieb bleibt. Dadurch kann ein Einsatz hergestellt werden, der beispielsweise einen Abschnitt beliebiger Länge aufweist, in dem keine Wellen vorhanden sind, bzw. nur eine einzige lang gezogene Welle, der also eben ausgebildet ist. Einem solchen Abschnitt geht mindestens ein Abschnitt mit Wellen voraus, und es schließt sich auch mindestens ein Abschnitt mit Wellen an den nicht gewellten Abschnitt an. Solche Ausbildungen von gewellten Einsätzen sind in manchen Fällen gewünscht, weil sie beispielsweise die Verwendung von mehreren einzelnen Einsätzen vermeiden können.According to the independent claim 7 it is provided that the Dauerhubbetrieb the press is temporarily interrupted, the feed remains in operation. Thereby, an insert can be made, for example, has a portion of any length, in which no waves are present, or only a single long drawn wave, which is thus flat. Such a section is preceded by at least one section of waves, and at least one section of waves adjoins the non-waved section. Such configurations of corrugated inserts are desired in some cases because they may, for example, avoid the use of multiple individual inserts.

Im Folgenden wird die Erfindung anhand von Ausführungsbeispielen beschrieben, die sich auf den Einsatz in einem Wärmetauscherrohr eines Ölkühlers beziehen.In the following, the invention will be described with reference to exemplary embodiments, which relate to the use in a heat exchanger tube of an oil cooler.

Die Figuren 1 und 2 zeigen fotografische Abbildungen eines bekannten Einsatzes und eines Einsatzes gemäß der Erfindung. Die Figur 3 ist eine prinzipielle Darstellung eines bekannten Einsatzes und die Figuren 4 und 5 sind Einsätze, jedoch gemäß vorliegender Erfindung. Die Fig. 6 zeigt eine nicht erfindungsgemäße Ansicht auf das Ende eines Flachrohres und die Fig. 7 zeigt einen Einsatz, der nach einem weiteren erfindungsgemäßen Verfahren hergestellt wurde.The FIGS. 1 and 2 show photographic images of a known insert and an insert according to the invention. The FIG. 3 is a schematic representation of a known use and the FIGS. 4 and 5 are inserts, but according to the present invention. The Fig. 6 shows a non-inventive view of the end of a flat tube and the Fig. 7 shows an insert which has been produced by a further method according to the invention.

Das Wärmetauscherrohr kann beliebig ausgebildet sein.The heat exchanger tube can be designed as desired.

Wegen des Wärmetauscherrohres des Ausführungsbeispiels wird auf das EP 742 418 B1 und dort insbesondere auf die Fig. 7 verwiesen. Das Wärmetauscherrohr besteht beispielsweise aus zwei Rohrschalen, die ineinandergelegt sind, wobei sie an ihrem Rand dicht verlötet sind, aber ihre Wärmetauschflächen sind beabstandet und begrenzen den Raum, in dem sich der Einsatz befindet. Das Wärmetauscherrohr besitzt mindestens eine Eintrittsöffnung 7 und eine Austrittsöffnung 8, die in der Fig. 5 bezeichnet sind. Beispielsweise das Öl durchströmt das Wärmetauscherrohr und befindet sich im Wärmeaustausch mit dem von der Kühlflüssigkeit durchströmten oberen und unteren Wärmetauscherrohr, wie es aus der erwähnten Fig. 7 des EP's deutlich zu sehen ist.Because of the heat exchanger tube of the embodiment is on the EP 742 418 B1 and there especially on the Fig. 7 directed. The heat exchanger tube, for example, consists of two tube shells which are nested, being soldered tight at its edge, but their heat exchange surfaces are spaced and limit the space in which the insert is located. The heat exchanger tube has at least one inlet opening 7 and an outlet opening 8, which in the Fig. 5 are designated. For example, the oil flows through the heat exchanger tube and is in heat exchange with the flowed through by the cooling liquid upper and lower heat exchanger tube, as is known from the above Fig. 7 the EP's clearly visible.

Der Einsatz gemäß dem Stand der Technik, wie er in den Fig. 1, 2 und 3 gezeigt ist, besitzt Wellenberge 1 und Wellentäler 2 und eine über den gesamten Einsatz reichende einheitliche Wellenlänge 4. In den Flanken 6, die die Wellenberge 1 mit den Wellentälern 2 verbinden, sind an sich bekannte Durchbrüche 5 vorgesehen, um das Öl oder die Kühlflüssigkeit den Durchtritt zu gestatten. Die Wellenlaufrichtung 9 des Einsatzes stimmt etwa mit der Anströmrichtung 10 überein, so dass das Öl oder die Kühlflüssigkeit durch die Durchbrüche 5 strömen muss, um von einer Welle zur nächsten Welle, bzw. von der Eintrittsöffnung 7 zur Austrittsöffnung 8 zu gelangen. Um nun ein gewünschtes Verhältnis der Kühlleistung zum Druckverlust zu erhalten, ist gemäß der Fig. 4 und gemäß der in den Figuren 1 und 2 mit "invention" bezeichneten Abbildungen vorgesehen, dass die Wellentäler 2 eine größere Länge aufweisen als die Wellenberge 2. Mit anderen Worten, die oft als Teilung bezeichnete Wellenlänge 4 wurde im Vergleich zum Stand der Technik vergrößert. Die Länge der Wellentäler 2 ist etwa doppelt so groß wie die Länge der Wellenberge 1. Es kann nachvollzogen werden, dass sich dadurch der Druckverlust reduzieren lässt, weil das Öl und/oder die Kühlflüssigkeit auf dem Weg von der Eintrittsöffnung 7 zur Austrittsöffnung 8 weniger Wellen oder Durchbrüche 5 zu überwinden hat als bei einem Einsatz gemäß dem Stand der Technik.The use according to the prior art, as in the Fig. 1 . 2 and 3 is shown, having corrugation peaks 1 and valleys 2 and over the entire insert reaching uniform wavelength 4. In the flanks 6, which connect the corrugation peaks 1 with the wave valleys 2, known openings 5 are provided to the oil or cooling liquid to the per se Permitting passage. The shaft running direction 9 of the insert coincides approximately with the direction of flow 10 , so that the oil or the cooling liquid has to flow through the openings 5 in order to pass from one shaft to the next shaft, or from the inlet opening 7 to the outlet opening 8 . In order to obtain a desired ratio of the cooling capacity to the pressure loss, according to the Fig. 4 and according to the in the FIGS. 1 and 2 Illustrated with "invention" images provided that the wave troughs 2 have a greater length than the wave crests 2. In other words, the wavelength 4 often referred to as pitch was increased compared to the prior art. The length of the wave troughs 2 is about twice as long as the length of the wave crests 1. It can be understood that thereby the pressure loss can be reduced, because the oil and / or the cooling liquid on the way from the inlet opening 7 to the outlet opening 8 less waves or breakthroughs 5 has to overcome than in a use according to the prior art.

Es handelt sich bei dem Einsatz um einen auf einer Presse in einem Stanzwerkzeug hergestellten Einsatz. Die Herstellung erfolgt von einem "endlosen" Bandmaterial, vorzugsweise aus Aluminium, was aus dem Stand der Technik sehr gut bekannt ist und deshalb nicht in einer Figur dargestellt wurde. Das Metallband wird mit einer bestimmten niedrigen aber über den gesamten Einsatz konstanten Vorschubgeschwindigkeit vom sogenannten Coil herunter und durch das Stanzwerkzeug transportiert, um einen Einsatz gemäß Fig. 3 bzw. gemäß dem Stand der Technik herzustellen.The insert is an insert made on a press in a punching tool. The preparation is made of an "endless" strip material, preferably of aluminum, which is very well known in the prior art and therefore not shown in a figure. The metal strip is down from the so-called coil with a certain low but constant over the entire use feed rate and transported through the punch to a use according to Fig. 3 or to produce according to the prior art.

Die Vorschubgeschwindigkeit ist bei der Herstellung des in Fig. 4 gezeigten Einsatzes ebenfalls konstant jedoch höher als beim Stand der Technik gemäß Fig. 3.The feed rate is in the production of the in Fig. 4 shown use also constant but higher than in the prior art according to Fig. 3 ,

Dadurch weist dieser Einsatz eine etwa doppelt so große Wellenlänge 4 auf als derjenige nach Fig. 3.As a result, this insert has an approximately twice the wavelength 4 than the one after Fig. 3 ,

Bei der Herstellung des Einsatzes gemäß Figur 5 wird die Vorschubgeschwindigkeit intervallartig verändert. Zunächst wird mit einer konstanten aber reduzierten Geschwindigkeit der Anfangsabschnitt A1 hergestellt. Dann wird mit einer konstanten aber erhöhten Vorschubgeschwindigkeit oder mit erhöhtem Vorschub der Mittelabschnitt A2 gefertigt, um unmittelbar anschließend die Geschwindigkeit oder den Vorschub wieder auf den Wert des Anfangsabschnittes A1 zu reduzieren, um den Endabschnitt A3 herzustellen. Die Geschwindigkeitsbeträge oder Vorschübe können durch Versuche ermittelt werden. Allgemein gilt, dass eine höhere Geschwindigkeit oder ein größerer Vorschub zu größeren Wellenlängen führt und umgekehrt, reduzierte Geschwindigkeit zu kleineren Wellenlängen.In the preparation of the insert according to FIG. 5 The feed rate is changed at intervals. First, the initial section A1 is produced at a constant but reduced speed. Then, at a constant but increased feed speed or with increased feed, the center portion A2 is made to immediately reduce the speed or the feed back to the value of the initial portion A1 to produce the end portion A3 . The speed amounts or feeds can be determined by tests. In general, a higher speed or a larger feed leads to longer wavelengths and vice versa, reduced speed to smaller wavelengths.

Das gleiche Ergebnis wird erreicht, wenn anstelle der Vorschubgeschwindigkeit die Dauerhubgeschwindigkeit der Presse variiert wird. Beispielsweise kann gemäß der Fig. 5 der Abschnitt A1 mit einer Dauerhubgeschwindigkeit von 240 Hüben / min. hergestellt werden, der folgende Abschnitt A2, der größere Wellenlängen 4 aufweist, kann mit 200 Hüben / min und der Endabschnitt A3 kann wieder mit 240 Hüben / min realisiert werden. Es ist jedoch klar, dass die Variation der Vorschubgeschwindigkeit oder des Vorschubs des Aluminiumbandes zu bevorzugen ist, weil ein oftmaliger Wechsel der Dauerhubgeschwindigkeit zu Lasten der Mechanik der Presse geht.The same result is achieved if, instead of the feed rate, the continuous stroke speed of the press is varied. For example, according to the Fig. 5 the section A1 with a Dauerhubgeschwindigkeit of 240 strokes / min. can be made, the following section A2, which has larger wavelengths 4 , can be realized with 200 strokes / min and the end section A3 can again be realized with 240 strokes / min. However, it is clear that the variation of the feed rate or the advance of the aluminum strip is preferable because a frequent change of the Dauerhubgeschwindigkeit is at the expense of the mechanics of the press.

Ein Pressenhub besteht bekanntlich aus einer 360 °- Vollkreis - Drehung der Exzenterwelle der Presse, wobei die Umformoperation im Bereich des unteren Totpunktes, also im Bereich von 180°, erfolgt. Der Bandvorschub erfolgt beispielsweise innerhalb einer Winkelstellung der Exzenterwelle zwischen 320° und 40°, also innerhalb eines 80°- Winkelweges, für dessen Durchlauf (über den oberen Totpunkt) je nach eingestellter Dauerhubgeschwindigkeit ein bestimmter Zeitraum zugeordnet ist, innerhalb desselben der Vorschub erfolgen kann. Durch entsprechende Programmierung wird nun erreicht, dass der Bandvorschub beispielsweise innerhalb eines 100°- Winkelweges erfolgt, also beispielsweise zwischen 310 ° und 50°, der bei gleicher Dauerhubgeschwindigkeit einen längeren Zeitraum zulässt, innerhalb desselben selbst bei gleicher Vorschubgeschwindigkeit eine größerer Weg bzw. ein längerer Vorschub absolviert wird, der längere Wellenlängen 4 ergibt. Die Grenzen der Winkelstellungen, innerhalb derer der Vorschub ausführbar ist, können von Fall zu Fall verschieden sein. Diese hängen unter anderem von dem Durchmesser der Exzenterwelle und von der Tiefe des Eingriffs des Oberwerkzeugs in das Unterwerkzeug ab. Ist diese Tiefe klein und der Durchmesser groß, können entsprechend breitere Grenzen ins Auge gefasst werden. Ein größerer Winkelweg (Bogenmaß) als 180°, also zwischen 270 ° und 90°, scheint jedoch selten realisierbar zu sein. Maximierte Vorschübe sind erreichbar, wenn neben der Verlängerung des Winkelweges gleichzeitig die Vorschubgeschwindigkeit erhöht wird.As is generally known, a press stroke consists of a 360 ° full circle rotation of the eccentric shaft of the press, the forming operation taking place in the area of the bottom dead center, that is to say in the region of 180 °. The tape feed takes place, for example, within an angular position of the eccentric shaft between 320 ° and 40 °, ie within an 80 ° - Winkelweges, for the passage (above the top dead center) depending on the set Dauerhubgeschwindigkeit a certain period is assigned, within the same feed can be done. By appropriate programming is now achieved that the tape feed takes place, for example, within a 100 ° - Winkelweges, so for example between 310 ° and 50 °, which allows a longer period for the same Dauerhubgeschwindigkeit, within the same even at the same feed rate a longer way or a longer Feed is completed, the longer wavelengths 4 results. The limits of the angular positions within which the feed is executable may vary from case to case. These hang among other things from the diameter of the eccentric shaft and from the depth of engagement of the upper tool in the lower tool. If this depth is small and the diameter is large, correspondingly broader limits can be envisaged. However, a larger angular path (radians) than 180 °, ie between 270 ° and 90 °, seems rarely feasible. Maximized feed rates are achievable if, in addition to the extension of the angular travel, the feed rate is simultaneously increased.

Das Wärmetauscherrohr gemäß der Fig. 6 ist ein geschweißtes, gelötetes oder gezogenes Flachrohr 11, wie es beispielsweise in luftgekühlten Ladeluftkühlern vorkommen könnte. Auch in solchen Wärmetauscherrohren 11 befindet sich ein Einsatz. Es ist reiner Zufall, dass dort die Wellenform des Einsatzes aus der Fig. 5 vorgesehen worden ist, denn die Ausbildung des Einsatzes hängt vom konkreten Anwendungsfalls ab. Auch der Einsatz aus der Fig. 6 kann Durchbrüche 5 besitzen, er kann aber auch ohne Durchbrüche 5 ausgebildet sein, denn beispielsweise die Ladeluft strömt senkrecht zur Bildebene durch das Flachrohr 11. Mit anderen Worten, die Anströmrichtung 10 und die in der Bildebene liegende Wellenlaufrichtung 9 stehen senkrecht zueinander, weshalb die Fig. 6 nicht Teil dieser Erfindung ist.The heat exchanger tube according to the Fig. 6 is a welded, soldered or drawn flat tube 11, as might occur, for example, in air-cooled intercoolers. Also in such heat exchanger tubes 11 is an insert. It is pure coincidence that there the waveform of the insert from the Fig. 5 has been provided, because the training of the use depends on the specific application. Also the use of the Fig. 6 may have openings 5 , but it can also be formed without openings 5 , for example, the charge air flows perpendicular to the image plane through the flat tube 11. In other words, the direction of flow 10 and lying in the image plane wave direction 9 are perpendicular to each other, which is why Fig. 6 not part of this invention.

In der Fig. 7 ist ein Einsatz prinzipiell abgebildet, der einen Mittelabschnitt A2 ohne Wellen aufweist, der jedoch im vorliegenden Zusammenhang als ein Abschnitt A2 mit einer einzigen lang gezogenen Welle angesehen wird. Ein solcher Abschnitt A2 wird dadurch hergestellt, dass der Dauerhubbetrieb der Exzenterpresse bei weiter laufendem Vorschub unterbrochen wird. Solche Einsätze sind wegen der erwähnten Unterbrechung des Dauerhubbetriebs vorzugsweise nicht für die Großserienfertigung vorgesehen. Der Anfangsabschnitt A1 und der Endabschnitt A3 kann aus mehreren Wellen gleich großer Wellenlänge 4 bestehen, wobei selbstverständlich auch hier derart variiert werden kann, dass innerhalb des Anfangsabschnitts A1 und/oder des Endabschnitts A3 unterschiedliche Wellenlängen 4 vorhanden sind. Im Endabschnitt A3 wurden deshalb, lediglich exemplarisch, Wellen unterschiedlicher Wellenlänge 4 vorgesehen. Die Länge der Abschnitte A1, A2, A3 kann frei gewählt werden und hängt vom konkreten Anwendungsfall des Einsatzes ab.In the Fig. 7 For example, an insert is shown in principle which has a central section A2 without waves, but which in the present context is regarded as a section A2 with a single elongated shaft. Such a section A2 is produced in that the Dauerhubbetrieb the eccentric press is interrupted with advancing feed. Such inserts are preferably not intended for mass production due to the mentioned interruption of Dauerhubbetriebs. The initial section A1 and the end section A3 may consist of a plurality of waves of equal wavelength 4 , it being understood that it is also possible here to vary such that different wavelengths 4 are present within the start section A1 and / or the end section A3 . Therefore, in the end section A3 , waves of different wavelengths 4 were provided merely by way of example. The length of the sections A1, A2, A3 can be chosen freely and depends on the specific application of the use.

Claims (8)

  1. Heat exchanger tube having a corrugated insert, the corrugated insert being inserted into the heat exchanger tube and being joined to the walls of the heat exchanger tube, preferably metallically, the corrugated insert having alternating wave peaks (1) and wave valleys (2), a specific wave height (3), a wave length (4) (pitch) and apertures (5) in the wave flanks (6), the wave running direction (9) corresponding approximately to the inward flow direction (10),
    characterized in that the wave valleys (2) have a greater length (7) than the wave peaks (1) - or vice versa.
  2. Heat exchanger tube according to Claim 2, characterized in that the wave valleys (2) are preferably twice as long as the wave peaks (2) - or vice versa.
  3. Heat exchanger tube having a corrugated insert, the corrugated insert being inserted into the heat exchanger tube and being joined to the walls of the heat exchanger tube, preferably metallically, the corrugated insert having alternating wave peaks (1) and wave valleys (2), a specific wave height (3), a wave length (4) (pitch) and apertures (5) in the wave flanks (6), the wave running direction (9) corresponding approximately to the inward flow direction (10),
    characterized in that
    the one-piece insert is formed from sections (A1, A3) having smaller wave lengths (4) and from sections (A2) having greater wave lengths (4), wherein a section (A1, A2, A3) is composed either of multiple waves of the same wave length (4) or at least of a wave of which the wave length (4) is greater than the wave length (4) in an adjacent section.
  4. Heat exchanger tube according to Claim 3, characterized in that the insert preferably has an initial section (A1) with a smaller wave length (4), a middle section (A2) with a greater wave length (4) and an end section (A3) with a smaller wave length (4).
  5. Heat exchanger tube according to Claim 4, having an inlet opening and an outlet opening for the medium flowing through the heat exchanger tube, characterized in that the wave length (4) in the initial section (A1) is preferably of the same size as in the end section (A3), wherein these sections (A1, A3) are those in which the inlet opening (7) of the medium into the heat exchanger tube and, respectively, the outlet opening (8) for the medium from the heat exchanger tube are located.
  6. Method for manufacturing corrugated inserts for a heat exchanger tube according to one of the preceding Claims 1 - 5, which are produced from a sheet metal strip, which are transported at a specific feed rate and with a specific feed length through a shaping tool on an eccentric press which operates in continuous stroke mode,
    characterized in that, with a constant continuous stroke rate, the feed rate is increased or reduced, wherein a section (A1, A3) of the insert having a smaller wave length (4) is produced with a reduced feed rate, and a section (A2) of the insert having a greater wave length (4) is produced with an increased feed rate,
    or in that, with a constant feed rate, the continuous stroke rate is increased or reduced, a section (A2) having a greater wave length (4) is formed with a reduced continuous stroke rate and a section (A1, A3) having a shorter wave length (4) is formed with an increased continuous stroke rate,
    or in that the angular positions of the eccentric shaft of the press between which the feed is implemented are changed within permissible limits, as a result of which the feed length is increased or reduced.
  7. Method for manufacturing corrugated inserts for a heat exchanger tube according to one of Claims 1 - 5, which are produced from a sheet metal strip, which is transported at a specific feed rate and with a specific feed length through a shaping tool on an eccentric press which operates in continuous stroke mode,
    characterized in that the continuous stroke mode is interrupted with the feed running, so that a corrugated insert having a section without waves or having a section with a single long drawn-out wave is produced.
  8. Method according to Claim 6 or 7, characterized in that the desired variations in the continuous stroke, the feed length and/or the feed rate are pre-programmed in a programming unit assigned to the press.
EP04000378.2A 2003-02-06 2004-01-10 Heat exchanger tube with corrugated insert and manufacturing method therefore Revoked EP1445570B1 (en)

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DE10304692A DE10304692A1 (en) 2003-02-06 2003-02-06 Corrugated insert for a heat exchanger tube
DE10304692 2003-02-06

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EP1445570A2 EP1445570A2 (en) 2004-08-11
EP1445570A3 EP1445570A3 (en) 2007-01-24
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DE10304692A1 (en) 2004-08-19
EP1445570A2 (en) 2004-08-11
US7255159B2 (en) 2007-08-14
EP1445570A3 (en) 2007-01-24
US20040177668A1 (en) 2004-09-16

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