EP1668303A1 - Soldered heat exchanger network - Google Patents

Soldered heat exchanger network

Info

Publication number
EP1668303A1
EP1668303A1 EP04786924A EP04786924A EP1668303A1 EP 1668303 A1 EP1668303 A1 EP 1668303A1 EP 04786924 A EP04786924 A EP 04786924A EP 04786924 A EP04786924 A EP 04786924A EP 1668303 A1 EP1668303 A1 EP 1668303A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
chamber
exchanger network
webs
soldered
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
EP04786924A
Other languages
German (de)
French (fr)
Other versions
EP1668303B1 (en
Inventor
Werner Helms
Jürgen Hägele
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 Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
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 Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Publication of EP1668303A1 publication Critical patent/EP1668303A1/en
Application granted granted Critical
Publication of EP1668303B1 publication Critical patent/EP1668303B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • 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
    • F28D1/03—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 plate-like or laminated conduits
    • F28D1/0391—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 plate-like or laminated conduits a single plate being bent to form one or more 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
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
    • F28F1/128—Fins with openings, e.g. louvered fins

Definitions

  • the invention relates to a soldered heat exchanger network according to the preamble of claim 1.
  • Heat exchanger e.g. B. coolant cooler or refrigerant condensers for motor vehicles have a heat exchanger network, which consists of tubes and fins, the tubes z. B. flows through of coolant or refrigerant and the fins of cooling air, in particular ambient air overflow.
  • the tubes are designed as flat tubes and the fins as corrugated fins, which are soldered to the flat longitudinal sides of the flat tubes with their corrugated ridges.
  • Flat tubes with greater depth, d. H. measured in the direction of the air flow are often designed as so-called multi-chamber tubes, d. H.
  • Such heat exchanger networks are manufactured in such a way that flat tubes and corrugated fins are cut to length and then “cassetteed” in a suitable device, that is to say corrugated fins are arranged next to the flat tube and joined to form a block, which is then braced and placed in a soldering furnace (optionally with the associated tube sheets or
  • a modified tube shape also shows two beads (webs) folded from the tube material, which are soldered to the opposite side of the tube and form a total of four chambers.
  • Folded multi-chamber flat tubes are known from EP-A 457 470, in which folded webs are alternately formed from opposite tube sides and in each case soldered to an opposite inner tube wall.
  • multi-chamber tubes with opposing folded webs are known, which only extend to the middle of the clear tube width and are soldered together there.
  • the multi-chamber tubes can be formed in one piece, ie provided with a welded longitudinal seam or also in two parts, ie with folded and soldered longitudinal seams arranged on the narrow sides.
  • Another form of a folded multi-chamber flat tube has become known from the applicant's DE-A 102 12 300, in which a manufacturing method is also described.
  • corrugated fins are arranged between the flat tubes and have gills or gill fields to improve the heat transfer.
  • Such gill fields such as. b. EP-B 547 309 shows being arranged continuously in the air flow direction or - as shown in US-A 4,693,307 - in individual gill fields, between which smooth, i. H. uncombed corrugated fin areas.
  • the object of the present invention is therefore to improve a brazed heat exchanger network of the type mentioned at the outset by suitable measures such that perfect brazing takes place both on the outside and on the inside of the multi-chamber flat tubes.
  • the corrugated ribs are smooth in the area of the webs, i. H. are not gilled.
  • In the area of the webs means: in the extension of the webs across the flat sides of the multi-chamber flat tube.
  • Gills or gill fields are arranged in the areas between the webs, so that gill fields are assigned to the chambers of the multi-chamber flat tube at approximately the same depth.
  • a "keeled" corrugated fin does not have a uniform fin height, but that in the areas of the individual gill fields there is a lower fin height, the minimum height, than in the smooth, ie ungilled areas, where a greater fin height, the maximum height, occurs
  • This unevenness in the height of the ribs can be attributed to the fact that by cutting and then “unscrewing” the gills, the corrugated fin is “drawn in” in the area of the gills, ie “waist”.
  • the inventors took advantage of this knowledge and adapted the corrugated fin with its gill arrangement to the multi-chamber flat tubes.
  • the multi-chamber flat tubes have longitudinal seams which are either soldered or welded and are preferably arranged on one or both narrow sides of the multi-chamber flat tube. This avoids asymmetries on the flat sides of the tubes that could affect the soldering process.
  • the corrugated ribs also have smooth areas on the inflow and outflow sides. In particular, straight leading and trailing edges and a laminar start-up section for the air flow are achieved.
  • the smooth areas of the corrugated fin each have the same and maximum fin height. This ensures that the same contact pressure is exerted on all webs and that the solder gaps between the web back and the inner pipe wall are evenly minimized. Uniform soldering with sufficient strength for a tie rod effect is thus achieved.
  • the areas covered with gills have a minimal rib height. This means that the tensioning force when tensioning the net does not act as a surface load on the shaft crests, but rather directly on the webs in a punctiform manner, thereby compressing the flat tubes in the area of the webs up to the stop.
  • the multi-chamber tube has two identical chambers, which are separated by a central web, in the area of which the corrugated fin is smooth.
  • This is the simplest form of the multi-chamber pipe, which is used for relatively small system depths.
  • the number of chambers or webs can be increased as desired, two webs with three chambers being a preferred solution for motor vehicle heat exchangers.
  • the corrugated fin of FIG. 1 in a side view Fig. 2 is a multi-chamber tube with lateral corrugated fins.
  • Fig. 1 shows a corrugated fin 1 in a view from above
  • Fig. 1a shows the corrugated fin 1 in a side view.
  • the corrugated fin 1 serves as a secondary heat exchange surface in air-cooled flat tube systems or heat exchanger networks.
  • the air ambient air
  • the rib height corresponds to the amplitude of the corrugation (cf. FIG. 1a) and is marked with H.
  • the corrugated fin 1 is preferably made of a thin aluminum sheet, into which gills 2 are cut to improve the heat transfer on the air side, which are arranged in the form of gill panels 3, 4 on the fin surface.
  • the gills 2 are - which is not shown here, but emerges from the aforementioned prior art (EP-B 547 309 or US-A 4,693,307) - inclined to the rib surface and form a so-called gill angle.
  • the incision and the subsequent twisting of the rib material results in a constriction in the area of the gill panels 3, 4, which are represented by dashed lines 5.
  • These constrictions lead to a reduction in the rib height H.
  • the reduced rib height is marked with h and represents the minimum rib height.
  • the maximum rib height is marked with H and occurs outside the gill fields 3, 4, i. H.
  • the corrugated fin 1 has corrugated ridges 1a, 1b with which the corrugated fin 1 rests on the pipes, not shown here. Because of the constrictions 5, the wave crests 1a, 1b thus do not form a continuous straight line. The gills 2 protrude into the air flow.
  • FIG. 2 shows a folded multi-chamber tube 6 which has two flat longitudinal sides 6a, 6b and two rounded narrow sides 6c, 6d. From the above Ren long side 6a, two webs 7, 8 are formed by folding, which are soldered to the opposite long side 6b and thus form tie rods.
  • the multi-chamber tube 6 is made of a sheet metal, which is closed on the narrow side 6d by a welded longitudinal seam 9.
  • the multi-chamber tube 6 thus has three chambers 10, 11, 12, in which a coolant or refrigerant flows. Outside the multi-chamber tube 6, corrugated fins 13, 14 are arranged on the longitudinal sides 6a, 6b thereof, which are soldered to the multi-chamber tube 6.
  • Corrugated fins 13, 14 and multi-chamber tube 6 thus represent a section of a heat exchanger network, not shown, which is constructed according to this pattern and can be used in coolant coolers or refrigerant condensers for motor vehicles.
  • the corrugated ribs 13, 14 each have three gill arrays 15a, 15b, 15c and 16a, 16b, 16c, between which non-keeled, ie smooth areas 17a, 17b and 18a, 18b are left.
  • the arrangement of the gill panels 15a, 15b, 15c, 16a, 16b, 16c is selected such that they are located in the area of the chambers 10, 11, 12 and the smooth areas 17a, 17b and 18a, 18b in the area of the webs 7, 8 are arranged.
  • these corrugated ribs also have reduced rib heights h due to the gill panels 15a to c and 16as to c and maximum rib heights H in the smooth regions 17a, 17b, 18a, 18b. Due to the selected arrangement, the maximum fin heights H, seen in the depth direction, are at the level of the webs 7, 8 and on the inflow and outflow sides of the corrugated fins 13, 14. As explained at the beginning, corrugated fins 13, 14 and multi-chamber tubes 6 are cassetted to form a heat exchanger network and then - to prepare for the soldering process - clamped using suitable clamping devices.

Landscapes

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

Abstract

The invention relates to a soldered heat exchanger network comprising folded flat multichamber tubes and wave-like ribs that are provided with fins. The multichamber tubes encompass at least two chambers, each of which is formed by folded webs that are soldered in the interior of the multichamber tube. According to the invention, the wave-like ribs (13, 14) are provided with fin-free fields (17a, 17b; 18a, 18b) in the area of the web or webs (7, 8).

Description

Gelötetes Wärmeübertragernetz Brazed heat exchanger network
Die Erfindung betrifft ein gelötetes Wärmeübertragernetz nach dem Oberbegriff des Patentanspruches 1.The invention relates to a soldered heat exchanger network according to the preamble of claim 1.
Wärmeübertrager, z. B. Kühlmittelkühler oder Kältemittelkondensatoren für Kraftfahrzeuge weisen ein Wärmeübertragernetz auf, welches aus Rohren und Rippen besteht, wobei die Rohre z. B. von Kühlmittel oder Kältemittel durchströmt und die Rippen von Kühlluft, insbesondere Umgebungsluft überströmt werden. Bei gelöteten Kühlsystemen sind die Rohre als Flachrohre und die Rippen als Wellrippen ausgebildet, die mit ihren Wellenkämmen mit den flachen Längsseiten der Flachrohre verlötet werden. Flachrohre mit größerer Tiefe, d. h. in Richtung der Luftströmung gemessen, werden vielfach als so genannte Mehrkammerrohre ausgebildet, d. h. sie weisen zur Abteilung einzelner Kammern Stege auf, die als Zuganker wirken und damit ein Aufblähen oder Aufblasen der Flachrohre infolge des Innendruckes verhindern. Bei gefalzten Mehrkammerrohren ist es daher wichtig, dass alle Stege gleichmäßig verlötet werden, damit das Flachrohr die erforderliche Innendruckstabilität erhält.Heat exchanger, e.g. B. coolant cooler or refrigerant condensers for motor vehicles have a heat exchanger network, which consists of tubes and fins, the tubes z. B. flows through of coolant or refrigerant and the fins of cooling air, in particular ambient air overflow. In the case of soldered cooling systems, the tubes are designed as flat tubes and the fins as corrugated fins, which are soldered to the flat longitudinal sides of the flat tubes with their corrugated ridges. Flat tubes with greater depth, d. H. measured in the direction of the air flow are often designed as so-called multi-chamber tubes, d. H. to the division of individual chambers they have webs which act as tie rods and thus prevent the flat tubes from being inflated or inflated as a result of the internal pressure. For folded multi-chamber pipes, it is therefore important that all webs are soldered evenly so that the flat pipe receives the required internal pressure stability.
Die Fertigung derartiger Wärmeübertragernetze erfolgt in der Weise, dass Flachrohre und Wellrippen auf Länge geschnitten und dann in einer geeigneten Vorrichtung „kassettiert" werden, d. h. Wellrippe neben Flachrohr angeordnet und zu einem Block gefügt werden, der anschließend verspannt und in einem Lötofen (gegebenenfalls mit den zugehörigen Rohrböden oderSuch heat exchanger networks are manufactured in such a way that flat tubes and corrugated fins are cut to length and then “cassetteed” in a suitable device, that is to say corrugated fins are arranged next to the flat tube and joined to form a block, which is then braced and placed in a soldering furnace (optionally with the associated tube sheets or
BESTATIGUNGSKOPIE Sammelrohren) verlötet wird. Die Verspannung drückt einerseits die Wellnppen mit ihren Kämmen gegen die Flachrohre und andererseits die gefalzten Stege gegen die Innenwand der Flachrohre. Dieser Anpressdruck muss, um eine möglichst gleichmäßige und vollständige Lötung zu gewährleisten gleichmäßig erfolgen. Gefalzte Mehrkammerflachrohre, kurz Mehrkammerrohre sind in verschiedenen Formen aus dem Stand der Technik bekannt, z. B. durch die EP-A 302 232 der Anmelderin. Das bekannte Flachrohr weist z. B. einen mittleren Steg auf, der mit der Gegenseite des Flachrohres verlötet ist und somit zwei Kammern bildet. Eine abgewandelte Rohrform zeigt zu- sätzlich zwei aus dem Rohrmaterial gefalzte Sicken (Stege), die mit der Gegenseite des Rohres verlötet sind und insgesamt vier Kammern bilden. Durch die EP-A 457 470 wurden gefalzte Mehrkammerflachrohre bekannt, bei welchen gefalzte Stege abwechselnd aus gegenüberliegenden Rohrseiten geformt und jeweils mit einer gegenüberliegenden Rohrinnenwand ver- lötet sind. Darüber hinaus sind auch Mehrkammerrohre mit sich gegenüber liegenden gefalzten Stegen bekannt, die nur bis zur Mitte der lichten Rohrweite reichen und dort miteinander verlötet sind. Die Mehrkammerrohre können einstückig ausgebildet, d. h. mit einer geschweißten Längsnaht versehen sein oder auch zweiteilig, d. h. mit an den Schmalseiten angeordneten gefalzten und gelöteten Längsnähten. Eine weitere Form eines gefalzten Mehrkammerflachrohres wurde durch die DE-A 102 12 300 der Anmelderin bekannt, in welcher auch ein Herstellungsverfahren beschrieben ist.BESTATIGUNGSKOPIE Manifolds) is soldered. The bracing presses the crests with their combs on the one hand against the flat tubes and on the other hand the folded webs against the inner wall of the flat tubes. This contact pressure must be even to ensure that the soldering is as uniform and complete as possible. Folded multi-chamber flat tubes, short multi-chamber tubes, are known in various forms from the prior art, for. B. by the applicant's EP-A 302 232. The known flat tube has z. B. on a central web, which is soldered to the opposite side of the flat tube and thus forms two chambers. A modified tube shape also shows two beads (webs) folded from the tube material, which are soldered to the opposite side of the tube and form a total of four chambers. Folded multi-chamber flat tubes are known from EP-A 457 470, in which folded webs are alternately formed from opposite tube sides and in each case soldered to an opposite inner tube wall. In addition, multi-chamber tubes with opposing folded webs are known, which only extend to the middle of the clear tube width and are soldered together there. The multi-chamber tubes can be formed in one piece, ie provided with a welded longitudinal seam or also in two parts, ie with folded and soldered longitudinal seams arranged on the narrow sides. Another form of a folded multi-chamber flat tube has become known from the applicant's DE-A 102 12 300, in which a manufacturing method is also described.
Wie bereits erwähnt, sind zwischen den Flachrohren Wellrippen angeordnet, welche zur Verbesserung der Wärmeübertragung Kiemen bzw. Kiemenfelder aufweisen. Solche Kiemenfelder können, wie z. b. die EP-B 547 309 zeigt, in Luftströmungsrichtung durchgehend oder - wie in der US-A 4,693,307 dargestellt - in einzelnen Kiemenfeldern angeordnet sein, zwischen denen sich glatte, d. h. ungekiemte Wellrippenbereiche befinden.As already mentioned, corrugated fins are arranged between the flat tubes and have gills or gill fields to improve the heat transfer. Such gill fields, such as. b. EP-B 547 309 shows being arranged continuously in the air flow direction or - as shown in US-A 4,693,307 - in individual gill fields, between which smooth, i. H. uncombed corrugated fin areas.
Die Anmelderin hat festgestellt, dass bei der Verlötung von gefalzten Mehrkammerflachrohren mit Wellrippen zu einem Wärmeübertragernetz Fehler auftreten, die zu einem „Aufblasen" der Flachrohre führten, was auf eine unzureichende Verlötung von einzelnen Stegen mit der gegenüberliegenden Rohrinnenwand zurückzuführen ist. Aufgabe der vorliegenden Erfindung ist daher, ein gelötetes Wärmeübertragernetz der eingangs genannten Art durch geeignete Maßnahmen so zu verbessern, dass eine einwandfreie Verlötung sowohl auf der Außen- als auch auf der Innenseite der Mehrkammerflachrohre stattfindet.The applicant has found that when soldering folded multi-chamber flat tubes with corrugated fins to a heat exchanger network, errors occur which lead to "inflation" of the flat tubes, which is due to inadequate soldering of individual webs to the opposite tube inner wall. The object of the present invention is therefore to improve a brazed heat exchanger network of the type mentioned at the outset by suitable measures such that perfect brazing takes place both on the outside and on the inside of the multi-chamber flat tubes.
Diese Aufgabe wird durch die Merkmale des Patenanspruches 1 gelöst. Erfindungsgemäß ist vorgesehen, dass die Wellrippen im Bereich der Stege glatt ausgebildet, d. h. nicht mit Kiemen besetzt sind. Im Bereich der Stege soll heißen: in Verlängerung der Stege quer zu den flachen Seiten des Mehrkammerflachrohres. In den Bereichen zwischen den Stegen sind Kiemen bzw. Kiemenfelder angeordnet, sodass den Kammern des Mehrkammerflachrohres jeweils Kiemenfelder in etwa gleicher Tiefe zugeordnet sind. Die Erfinder haben festgestellt, dass eine „gekiemte" Wellrippe keine gleichmäßige Rippenhöhe aufweist, sondern dass in den Bereichen der einzelnen Kiemenfelder eine geringere Rippenhöhe, die Minimalhöhe, vorliegt als in den glatten, d. h. ungekiemten Bereichen, wo eine größere Rippenhöhe, die Maximalhöhe, auftritt. Diese Ungleich äßigkeit der Rippenhöhe ist darauf zurückzuführen, dass durch das Einschneiden und anschließende „Herausdrehen" der Kiemen ein „Einziehen" der Wellrippe im Bereich der Kiemen, d. h. eine „Taillierung" erfolgt. Die Erfinder haben sich diese Erkenntnis zu Nutze gemacht und die Wellrippe mit ihrer Kiemenanordnung an die Mehrkammerflachrohre angepasst. Damit wird der Vorteil erreicht, dass beim Spannen des Wärmeübertragernetzes nach dem Kassettieren ein gleichmäßiger Anpressdruck auf alle Stege über die Wellrippen ausgeübt wird. Dies führt anschließend zu einer gleichmäßigen festen Verlötung aller Stege, sodass diese ihre Zugankerfunktion in vollem Umfang ausüben können und somit ein „Aufblasen" der Rohre verhindern.This object is achieved by the features of patent claim 1. According to the invention it is provided that the corrugated ribs are smooth in the area of the webs, i. H. are not gilled. In the area of the webs means: in the extension of the webs across the flat sides of the multi-chamber flat tube. Gills or gill fields are arranged in the areas between the webs, so that gill fields are assigned to the chambers of the multi-chamber flat tube at approximately the same depth. The inventors have found that a "keeled" corrugated fin does not have a uniform fin height, but that in the areas of the individual gill fields there is a lower fin height, the minimum height, than in the smooth, ie ungilled areas, where a greater fin height, the maximum height, occurs This unevenness in the height of the ribs can be attributed to the fact that by cutting and then “unscrewing” the gills, the corrugated fin is “drawn in” in the area of the gills, ie “waist”. The inventors took advantage of this knowledge and adapted the corrugated fin with its gill arrangement to the multi-chamber flat tubes. This has the advantage that when the heat exchanger network is tensioned after the cassette, a uniform contact pressure is exerted on all webs via the corrugated fins. This then leads to a uniform, firm soldering of all the webs, so that they can fully perform their tie rod function and thus prevent the pipes from "inflating".
In vorteilhafter Ausgestaltung der Erfindung weisen die Mehrkammerflachrohre Längsnähte auf, die entweder gelötet oder geschweißt und vorzugsweise auf einer oder beiden Schmalseiten des Mehrkammerflachrohres angeordnet sind. Damit werden Asymmetrien auf den flachen Seiten der Rohre vermieden, die den Lötprozess beeinträchtigen könnten. In weiterer vorteilhafter Ausgestaltung der Erfindung weisen die Wellrippen auch auf der An- und Abströmseite glatte Bereiche auf. Damit werden vor allem gerade An- und Abströmkanten und eine laminare Anlaufstrecke für die Luftströmung erreicht.In an advantageous embodiment of the invention, the multi-chamber flat tubes have longitudinal seams which are either soldered or welded and are preferably arranged on one or both narrow sides of the multi-chamber flat tube. This avoids asymmetries on the flat sides of the tubes that could affect the soldering process. In a further advantageous embodiment of the invention, the corrugated ribs also have smooth areas on the inflow and outflow sides. In particular, straight leading and trailing edges and a laminar start-up section for the air flow are achieved.
In weiterer vorteilhafter Ausgestaltung der Erfindung weisen die glatten Bereiche der Wellrippe jeweils eine gleiche und maximale Rippenhöhe auf. Dadurch wird sichergestellt, dass auf sämtliche Stege derselbe Anpressdruck ausgeübt und die Lotspalte zwischen Stegrücken und Rohrinnenwand gleichmäßig minimiert werden. Damit ist eine gleichmäßige Verlötung mit hinreichender Festigkeit für eine Zugankerwirkung erreicht.In a further advantageous embodiment of the invention, the smooth areas of the corrugated fin each have the same and maximum fin height. This ensures that the same contact pressure is exerted on all webs and that the solder gaps between the web back and the inner pipe wall are evenly minimized. Uniform soldering with sufficient strength for a tie rod effect is thus achieved.
In weiterer Ausgestaltung der Erfindung weisen die mit Kiemen besetzten Bereiche eine minimale Rippenhöhe auf. Damit wirkt die Spannkraft beim Spannen des Netzes nicht als Flächenlast auf die Wellenkämme, sondern etwa punktförmig direkt auf die Stege, dadurch werden die Flachrohre im Bereich der Stege bis zum Anschlag zusammengedrückt.In a further embodiment of the invention, the areas covered with gills have a minimal rib height. This means that the tensioning force when tensioning the net does not act as a surface load on the shaft crests, but rather directly on the webs in a punctiform manner, thereby compressing the flat tubes in the area of the webs up to the stop.
In weiterer Ausgestaltung der Erfindung weist das Mehrkammerrohr zwei gleiche Kammern auf, die durch einen mittleren Steg getrennt sind, in dessen Bereich die Wellrippe glatt ausgebildet ist. Dieses ist die einfachste Form des Mehrkammerrohres, die bei relativ geringen Systemtiefen Anwendung findet.In a further embodiment of the invention, the multi-chamber tube has two identical chambers, which are separated by a central web, in the area of which the corrugated fin is smooth. This is the simplest form of the multi-chamber pipe, which is used for relatively small system depths.
In weiterer vorteilhafter Ausgestaltung der Erfindung kann die Zahl der Kammern bzw. der Stege beliebig erhöht werden, wobei zwei Stege mit drei Kammern eine bevorzugte Lösung für Kraftfahrzeugwärmeübertrager darstellen.In a further advantageous embodiment of the invention, the number of chambers or webs can be increased as desired, two webs with three chambers being a preferred solution for motor vehicle heat exchangers.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im Folgenden näher beschreiben. Es zeigenAn embodiment of the invention is shown in the drawing and will be described in more detail below. Show it
Fig. 1 eine Wellrippe in einer Ansicht von oben,1 is a corrugated fin in a view from above,
Fig. 1a die Wellrippe gemäß Fig. 1 in einer Seitenansicht und Fig. 2 ein Mehrkammerrohr mit seitlichen Wellrippen.Fig. 1a, the corrugated fin of FIG. 1 in a side view Fig. 2 is a multi-chamber tube with lateral corrugated fins.
Fig. 1 zeigt eine Wellrippe 1 in einer Ansicht von oben, Fig. 1a zeigt die Wellrippe 1 in einer Seitenansicht. Die Wellrippe 1 dient als sekundäre Wärmeaustauschfläche bei luftgekühlten Flachrohrsystemen bzw. Wärmeübertragernetzen. Die Wellrippe 1 wird in Richtung des Pfeils L von Luft (Umgebungsluft) angeströmt und weist in Luftströmungsrichtung L eine Tiefe T auf. Die Rippenhöhe entspricht der Amplitude der Wellung (vgl. Fig. 1a) und ist mit H gekennzeichnet. Die Wellrippe 1 wird vorzugsweise aus einem dünnen Aluminiumblech hergestellt, in welches zur Verbesserung der Wärmeübertragung auf der Luftseite Kiemen 2 eingeschnitten sind, die in Form von Kiemenfeldern 3, 4 auf der Rippenoberfläche angeordnet sind. Die Kiemen 2 sind - was hier nicht dargestellt ist, jedoch aus dem eingangs genannten Stand der Technik (EP-B 547 309 oder US-A 4,693,307) hervorgeht - gegenüber der Rippenfläche geneigt und bilden einen so genannten Kiemenwinkel. Durch diesen Herstell ungsprozess der Kiemen 2, d. h. das Einschneiden und das anschließende Verdrehen des Rippenmaterials ergibt sich im Bereich der Kiemenfelder 3, 4 eine Einschnürung, die durch gestrichelte Linien 5 dargestellt sind. Diese Einschnürungen führen zu einer Re- duzierung der Rippenhöhe H. Die reduzierte Rippenhöhe ist mit h gekennzeichnet und stellt die minimale Rippenhöhe dar. Die maximale Rippenhöhe ist mit H gekennzeichnet und tritt außerhalb der Kiemenfelder 3, 4 auf, d. h. in Fig. 1 auf der An- und Abströmseite sowie in der Mitte der Wellrippe 1. Wie in Fig. 1a dargestellt, weist die Wellrippe 1 Wellenkämme 1a, 1b auf, mit denen die Wellrippe 1 an den hier nicht dargestellten Rohren anliegt. Aufgrund der Einschnürungen 5 bilden die Wellenkämme 1a, 1 b somit keine durchgehende gerade Linie. Die Kiemen 2 ragen in die Luftströmung hinein.Fig. 1 shows a corrugated fin 1 in a view from above, Fig. 1a shows the corrugated fin 1 in a side view. The corrugated fin 1 serves as a secondary heat exchange surface in air-cooled flat tube systems or heat exchanger networks. The air (ambient air) flows against the corrugated fin 1 in the direction of the arrow L and has a depth T in the air flow direction L. The rib height corresponds to the amplitude of the corrugation (cf. FIG. 1a) and is marked with H. The corrugated fin 1 is preferably made of a thin aluminum sheet, into which gills 2 are cut to improve the heat transfer on the air side, which are arranged in the form of gill panels 3, 4 on the fin surface. The gills 2 are - which is not shown here, but emerges from the aforementioned prior art (EP-B 547 309 or US-A 4,693,307) - inclined to the rib surface and form a so-called gill angle. Through this manufacturing process of the gills 2, d. H. the incision and the subsequent twisting of the rib material results in a constriction in the area of the gill panels 3, 4, which are represented by dashed lines 5. These constrictions lead to a reduction in the rib height H. The reduced rib height is marked with h and represents the minimum rib height. The maximum rib height is marked with H and occurs outside the gill fields 3, 4, i. H. 1 on the inflow and outflow side and in the center of the corrugated fin 1. As shown in FIG. 1a, the corrugated fin 1 has corrugated ridges 1a, 1b with which the corrugated fin 1 rests on the pipes, not shown here. Because of the constrictions 5, the wave crests 1a, 1b thus do not form a continuous straight line. The gills 2 protrude into the air flow.
Fig. 2 zeigt ein gefalztes Mehrkammerrohr 6, welches zwei flache Längs- seite 6a, 6b und zwei gerundete Schmalseiten 6c, 6d aufweist. Aus der obe- ren Längsseite 6a sind zwei Stege 7, 8 durch Falzen ausgeformt, die mit der gegenüberliegenden Längsseite 6b verlötet sind und somit Zuganker bilden. Das Mehrkammerrohr 6 ist aus einem Blech hergestellt, welches an der Schmalseite 6d durch eine geschweißte Längsnaht 9 geschlossen ist. Das Mehrkammerrohr 6 weist somit drei Kammern 10, 11 , 12 auf, in welchen ein Kühl- oder Kältemittel strömt. Außerhalb des Mehrkammerrohres 6 sind auf dessen Längsseiten 6a, 6b Wellrippen 13, 14 angeordnet, die mit dem Mehrkammerrohr 6 verlötet werden. Wellrippen 13, 14 und Mehrkammerrohr 6 stellen somit einen Ausschnitt eines nicht dargestellten Wärmeübertrager- netzes dar, welches nach diesem Muster aufgebaut ist und bei Kühlmittelkühlern oder Kältemittelkondensatoren für Kraftfahrzeuge Verwendung finden kann. Die Wellrippen 13, 14 weisen jeweils drei Kiemenfelder 15a, 15b, 15c und 16a, 16b, 16c auf, zwischen denen ungekiemte, d. h. glatte Bereiche 17a, 17b und 18a, 18b belassen sind. Die Anordnung der Kiemenfelder 15a, 15b, 15c, 16a, 16b, 16c ist so gewählt, dass sich diese im Bereich der Kammern 10, 11 , 12 befinden und die glatten Bereiche 17a, 17b und 18a, 18b im Bereich der Stege 7, 8 angeordnet sind. Wie oben erläutert, weisen auch diese Wellrippen aufgrund der Kiemenfelder 15a bis c und 16as bis c reduzierte Rippenhöhen h und in den glatten Bereichen 17a, 17b, 18a, 18b maximale Rippenhöhen H auf. Aufgrund der gewählten Anordnung liegen die maximalen Rippenhöhen H, in Tiefenrichtung gesehen, auf Höhe der Stege 7, 8 sowie auf den An- und Abströmseiten der Wellrippen 13, 14. Wie eingangs erläutert, werden Wellrippen 13, 14 und Mehrkammerrohre 6 zu einem Wärmeübertragernetz kassettiert und anschließend - zur Vorberei- tung auf den Lötprozess - durch geeignete Spannmittel gespannt. Dabei treten Spannkräfte zwischen den Wellrippen 13, 14 und den Mehrkammerrohren 6 auf, die hier durch Pfeile F, jeweils in Richtung der Stege 7, 8 zeigend, dargestellt sind. Beim diesem Spannprozess werden die Stege 7, 8 somit gegen die Rohrinnenwand der Längsseite 6b gedrückt, sodass sich an den Kontaktstellen ein minimaler Lötspalt einstellt. Dies gewährleistet eine vollständige Verlötung und verleiht dem Mehrkammerrohr 6 somit die erforderliche Innendruckstabilität.2 shows a folded multi-chamber tube 6 which has two flat longitudinal sides 6a, 6b and two rounded narrow sides 6c, 6d. From the above Ren long side 6a, two webs 7, 8 are formed by folding, which are soldered to the opposite long side 6b and thus form tie rods. The multi-chamber tube 6 is made of a sheet metal, which is closed on the narrow side 6d by a welded longitudinal seam 9. The multi-chamber tube 6 thus has three chambers 10, 11, 12, in which a coolant or refrigerant flows. Outside the multi-chamber tube 6, corrugated fins 13, 14 are arranged on the longitudinal sides 6a, 6b thereof, which are soldered to the multi-chamber tube 6. Corrugated fins 13, 14 and multi-chamber tube 6 thus represent a section of a heat exchanger network, not shown, which is constructed according to this pattern and can be used in coolant coolers or refrigerant condensers for motor vehicles. The corrugated ribs 13, 14 each have three gill arrays 15a, 15b, 15c and 16a, 16b, 16c, between which non-keeled, ie smooth areas 17a, 17b and 18a, 18b are left. The arrangement of the gill panels 15a, 15b, 15c, 16a, 16b, 16c is selected such that they are located in the area of the chambers 10, 11, 12 and the smooth areas 17a, 17b and 18a, 18b in the area of the webs 7, 8 are arranged. As explained above, these corrugated ribs also have reduced rib heights h due to the gill panels 15a to c and 16as to c and maximum rib heights H in the smooth regions 17a, 17b, 18a, 18b. Due to the selected arrangement, the maximum fin heights H, seen in the depth direction, are at the level of the webs 7, 8 and on the inflow and outflow sides of the corrugated fins 13, 14. As explained at the beginning, corrugated fins 13, 14 and multi-chamber tubes 6 are cassetted to form a heat exchanger network and then - to prepare for the soldering process - clamped using suitable clamping devices. Here, clamping forces occur between the corrugated fins 13, 14 and the multi-chamber tubes 6, which are shown here by arrows F, each pointing in the direction of the webs 7, 8. In this tensioning process, the webs 7, 8 are thus pressed against the inner tube wall of the long side 6b, so that a minimal soldering gap is established at the contact points. This ensures a complete soldering and thus gives the multi-chamber tube 6 the required internal pressure stability.
Die Erfindung ist anhand des obigen Ausführungsbeispieles beschrieben, d. h. für ein Mehrkammerohr mit zwei Stegen und drei Kammern. Abwandlungen sowohl in der Form als auch in der Anzahl der Stege und somit in der Anzahl der Kammern liegen ebenfalls im Bereich der Erfindung. Wesentlich bei allen Ausführungsformen ist, dass die von den Wellrippen auf das Mehrklammerrohr ausgeübten Spannkräfte stets auf die Stege gerichtet sind und dort die erforderliche Pressung bewirken. The invention is described with reference to the above embodiment, i. H. for a multi-chamber pipe with two webs and three chambers. Modifications both in the form and in the number of webs and thus in the number of chambers are also within the scope of the invention. It is essential in all embodiments that the clamping forces exerted by the corrugated fins on the multi-clamp tube are always directed at the webs and cause the required pressure there.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Gelötetes Wärmeübertragernetz, bestehend aus gefalzten Mehrkammerflachrohren und mit Kiemen besetzten Wellrippen, wobei die Mehrkammerrohre mindestens zwei Kammern aufweisen, die jeweils durch gefalzte, im Inneren des Mehrkammerrohres verlötete Stege gebildet werden, dadurch gekennzeichnet, dass die Wellrippen (13, 14) im Bereich des Steges bzw. der Stege (7, 8) kiemenfreie Felder (17a, 17b; 18a, 18b) aufweisen.1.Soldered heat exchanger network, consisting of folded multi-chamber flat tubes and corrugated fins with gills, the multi-chamber tubes having at least two chambers, which are each formed by folded webs soldered inside the multi-chamber tube, characterized in that the corrugated fins (13, 14) in the area of the web or webs (7, 8) have gill-free fields (17a, 17b; 18a, 18b).
2. Wärmeübertragernetz nach Anspruch 1 , dadurch gekennzeichnet, dass das Mehrkammerohr (6) eine gelötete Längsnaht aufweist.2. Heat exchanger network according to claim 1, characterized in that the multi-chamber pipe (6) has a soldered longitudinal seam.
3. Wärmeübertragernetz nach Anspruch 1 , dadurch gekennzeichnet, dass das Mehrkammerrohr (6) eine geschweißte Längsnaht (9), vorzugsweise auf der Schmalseite (6d) aufweist.3. Heat exchanger network according to claim 1, characterized in that the multi-chamber tube (6) has a welded longitudinal seam (9), preferably on the narrow side (6d).
4. Wärmeübertragernetz nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass die Wellrippen (13, 14) jeweils einen glatten Anström- und Abströmbereich aufweisen.4. Heat exchanger network according to claim 1, 2 or 3, characterized in that the corrugated fins (13, 14) each have a smooth inflow and outflow area.
5. Wärmeübertragernetz nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die kiemenfreien Felder (17a, 17b; 18a, 18b) eine gleiche und maximale Rippenhöhe H aufweisen.5. Heat exchanger network according to one of claims 1 to 4, characterized in that the gill-free fields (17a, 17b; 18a, 18b) have the same and maximum fin height H.
6. . Wärmeübertragernetz nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die mit Kiemen besetzten Bereiche, so ge- nannte Kiemenfelder, (15a, 15b, 15c; 16a, 16d, 16c) eine minimale Rippenhöhe h aufweisen. 6. Heat exchanger network according to one of claims 1 to 5, characterized in that the areas covered with gills, so- called gill panels (15a, 15b, 15c; 16a, 16d, 16c) have a minimal rib height h.
7. Wärmeübertragernetz nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Mehrkammerrohr (6) einen gelöteten Steg auf halber Rohrtiefe T und die Wellrippen (1 ) zwei Kiemenfelder (3, 4) aufweisen.7. Heat exchanger network according to one of the preceding claims, characterized in that the multi-chamber tube (6) has a soldered web at half the tube depth T and the corrugated fins (1) have two gill panels (3, 4).
8. Wärmeübertragernetz nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Mehrkammerrohr (6) zwei (n) Stege (7, 8) und die Wellrippen (13, 14) drei (n+1 ) Kiemenfelder (15a, 15b, 15c; 16a, 16b, 16c) aufweisen. 8. Heat exchanger network according to one of claims 1 to 6, characterized in that the multi-chamber tube (6) two (n) webs (7, 8) and the corrugated fins (13, 14) three (n + 1) gill panels (15a, 15b, 15c; 16a, 16b, 16c).
EP04786924.3A 2003-09-19 2004-09-09 Soldered heat exchanger network Not-in-force EP1668303B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10343905A DE10343905A1 (en) 2003-09-19 2003-09-19 Soldered heat transfer network
PCT/EP2004/010068 WO2005028986A1 (en) 2003-09-19 2004-09-09 Soldered heat exchanger network

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EP1668303A1 true EP1668303A1 (en) 2006-06-14
EP1668303B1 EP1668303B1 (en) 2018-04-04

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EP (1) EP1668303B1 (en)
CN (1) CN1853082A (en)
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WO2005028986A1 (en) 2005-03-31
DE10343905A1 (en) 2005-06-09
US20070029074A1 (en) 2007-02-08
EP1668303B1 (en) 2018-04-04
CN1853082A (en) 2006-10-25
US20090266527A1 (en) 2009-10-29

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