EP2867602B1 - Flat tube and heat exchanger having a flat tube of said type - Google Patents

Flat tube and heat exchanger having a flat tube of said type Download PDF

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Publication number
EP2867602B1
EP2867602B1 EP13732913.2A EP13732913A EP2867602B1 EP 2867602 B1 EP2867602 B1 EP 2867602B1 EP 13732913 A EP13732913 A EP 13732913A EP 2867602 B1 EP2867602 B1 EP 2867602B1
Authority
EP
European Patent Office
Prior art keywords
side wall
material strip
flat tube
tube
region
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.)
Active
Application number
EP13732913.2A
Other languages
German (de)
French (fr)
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EP2867602A1 (en
Inventor
Christoph Kästle
Steffen Marx
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
Mahle Behr GmbH and Co KG
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Application filed by Mahle Behr GmbH and Co KG filed Critical Mahle Behr GmbH and Co KG
Publication of EP2867602A1 publication Critical patent/EP2867602A1/en
Application granted granted Critical
Publication of EP2867602B1 publication Critical patent/EP2867602B1/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
    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • 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
    • 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
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements

Definitions

  • the invention relates to a flat tube, in particular for a heat exchanger, of a flat strip of material with two opposing first and second side walls, which are interconnected by means of third and fourth side walls.
  • the invention also relates to a heat exchanger with such a flat tube.
  • Flat tubes for heat exchangers are known in many configurations in the prior art.
  • extruded flat tubes with a plurality of webs for the formation of individual fluid channels for capacitors or evaporators are well known.
  • straw tubes are known in which a metal strip is folded by folding, for example, to a single or multi-chamber tube, such as B-tube.
  • These folding tubes are typically first sealed by the soldering process for soldering the entire heat exchanger and have at least one or two fluid chambers, through which a medium can flow.
  • the DE 102006054814 A1 discloses a soldered flat tube for capacitors or evaporators, in which the tube is formed of two half-shells, which overlap on the short sides and are soldered there, wherein in the interior a rib is arranged such that this rib also in the overlapping tube portion is present and there is soldered to the pipe wall.
  • this embodiment presents problems in terms of rather complex manufacturability and in terms of costs caused thereby, since the production of the multi-part tube with inner fin means increased manufacturing costs, both during manufacture and during assembly of at least three parts connected to a pipe become.
  • the DE 102006050319 A1 discloses a flat tube formed from a sheet metal strip, wherein the sheet metal strip is bent such that the closure of the sheet metal strip is arranged on a short side of the tube. Inside the tube, a rib is also arranged, which is received in the region of the connection of the sheet side edges between these side edges.
  • the EP 1243884 A2 discloses a flat tube, which is formed from a metal strip, wherein a central web is formed, which is formed by a hook-like deformation of the edge regions of the metal strip, wherein a corrugated fin is arranged in the interior of the tube.
  • the tube design of the EP 1243884 A2 has the disadvantage that the internal pressure stability is not optimally pronounced, in particular in the central region of the web, and in particular in the area of the solder joint, leaks may occur in applications under higher pressures.
  • the DE 10 2006 035 210 discloses a flat tube formed from a folded sheet of material. On one of the narrow sides of the material strip is double-layered together. An inner rib arranged in the interior of the flat tube abuts against the inner wall of the narrow sides at the end.
  • the object is to provide such a heat exchanger, which has an increased pressure stability, in particular in the region of its flat tubes.
  • An embodiment of the flat tube according to the invention provides a flat tube, in particular for a heat exchanger, of a flat strip of material with two opposing first and second side walls, which are interconnected by third and fourth side walls, wherein the third side wall by two portions of Material strip is formed which are applied to each other in a double-ply, wherein an inner fin is disposed in the interior of the flat tube, and the end against the third side wall and the fourth side wall and between the third side wall and the fourth side wall alternately on the first side wall and the second Sidewall supported.
  • the third side wall has an angled or arcuate contour.
  • the fourth side wall has an angled or arcuate contour.
  • the inner rib is formed at its one end portion arcuate or angular and rests against the third side wall and is formed at its other end portion arcuate or angled and rests against the fourth side wall.
  • the third side wall is formed with an inner portion and an outer portion of the material strip.
  • a bevel is provided in the transition region from the first side wall to the third side wall at the inner portion of the material strip, wherein the outer portion of the material strip is attached to the inner portion of the strip of material and ends in the region of the slope of the inner portion of the material strip.
  • the end of the outer portion of the strip of material conforms to the contour of the inner portion of the strip of material in the area of the slope and terminates substantially flush.
  • the flat tube with a tube width between 9 mm and 60 mm, and / or with a tube height between 1.5 mm and 30 mm, and / or with a wall thickness s of the material strip between 160 .mu.m and 500 .mu.m, and a Wall thickness of the inner fin is formed between 60 and 200 microns.
  • the dimensions of the inner rib before insertion into the strip of material are greater than the inner dimensions of the strip of material, so that the inner rib can be inserted under bias in the strip of material.
  • the dimensions of the inner rib before insertion into the strip of material are smaller than or equal to the inner dimensions of the strip of material, so that the inner rib can be inserted without bias in the strip of material.
  • the FIG. 1 shows a heat exchanger 1, in particular an evaporator, in a perspective view.
  • the evaporator 1 has a tube-fin block 2 with flat tubes 3 and arranged between the flat tubes ribs 4.
  • the flat tubes 3 are fluidly connected at its two opposite ends with the manifolds 5 and 6, wherein the upper header box 5 consists of two chambers 7.8 , wherein the chamber 7 is the inlet-side chamber, which is connected to an inlet connection pipe 9, wherein the chamber 8 is the outlet chamber, which is connected to an outlet connection pipe 10.
  • the lower collection box 6 advantageously has at least one chamber which effects a deflection in the depth.
  • the inlet port is preferably located laterally on the short side of the header tank and preferably on the leeward side of the heat exchanger.
  • the outlet port is preferably at a frontal arranged long side of the header tank and preferably on the windward side of the heat exchanger.
  • FIG. 2 shows a section through the tube block 2 of the FIG. 1 , wherein the flat tubes 3 and the corrugated fins 4 are arranged alternately side by side.
  • the flat tubes 3 are shown in section, so that the fluid flowing through the flat tubes 3, flows quasi perpendicular to the plane through the tubes.
  • the corrugated fins are shown only schematically, wherein the corrugated fins are traversed quasi-parallel to the plane of air.
  • FIG. 3a shows a flat tube 20 in section, wherein the flat tube of two opposing first and second side walls 21, 22 and two opposing third and fourth side walls 23, 24, wherein the third and fourth side walls 23, 24, the first and second side walls 21, 22 connect together.
  • the side 24 connects as a fourth side
  • the third side wall 23 connects the two first and second side walls 21 and 22 in the embodiment on the right side.
  • the flat tube can be recognized as such, which means that the third and fourth side walls 23, 24 are significantly shorter in their extension than the extension of the first and second side walls 21, 22.
  • the first, the second and the fourth side wall 21, 22, 24 each formed a single layer, wherein the third side wall 23 is formed by two portions 25, 26 of the material strip 27 of the flat tube, which adjacent to each other a kind of double wall in form two-ply copy.
  • the third and fourth side walls 23, 24 are designed arcuate. Arched may preferably be semi-circular or otherwise bent mean.
  • the third side wall 23 in this case has an inner wall and an outer wall, wherein the inner wall, starting from the first side wall 21 merges with a step in the arcuate contour, so that the outer side wall rests in the region of this stage with its end.
  • the inner axial length B V is shown by the arrow.
  • the tube width ie the outer extent in the lateral direction, ie B v plus the wall thicknesses of the respective third and fourth side wall 23, 24, is preferably between 9 mm and 60 mm, particularly advantageously between 10 mm and 30 mm.
  • the tube width is referred to as B R.
  • the tube height H is advantageously between 1.5 mm and 30 mm.
  • the wall thickness s of the outer contour is between 160 ⁇ m and 500 ⁇ m, preferably 180 ⁇ m to 250 ⁇ m.
  • the FIG. 3b shows the inner rib, which is provided for insertion into the flat tube 20.
  • the inner rib 30 is formed in a length B U , which is longer than the inner length B V of the flat tube.
  • the wall thickness of the inner fin is preferably in the range of 60 to 200 microns.
  • the number of lands is preferably about 2 to 20.
  • the inner rib 30 rests only on a tube radius 33.
  • the region 34 lies in particular in the overlapping region of the fold and may possibly be set up slightly, so that a gap is created between region 34 and 33.
  • the FIG. 4 shows flat tube 20 with the inner rib 30 in the assembled state.
  • the arcuate region 33 or the arcuate region 34 of the inner rib 30 is located on the arcuate region of the third and fourth side walls 23, 24 of the flat tube 20 inside flat.
  • the sheets 36 abut on the substantially flat inner side of the first and second side surfaces 21, 22 of the flat tube 20 inside.
  • the FIG. 5 shows in an enlarged detail the end portion with the third side wall 23, which is formed double-layered.
  • the inner band edge or the inner portion 26 of the material strip 27 is formed by a step or by an angled portion such that it deviates from this level or this bend from the plane or straight line of the first side wall 21 and merges into the arcuate end portion 28 ,
  • the outer band edge or the outer portion 25 of the material strip 27 is chamfered in the region of its band edge such that in the contact region between the first and the second band edge or in the contact region of the end of the first section with the step of the second section, a chamfering or rounding, so that an adjustment of the slope is found in this area.
  • the adaptation of the end of the tape is carried out with the aid of a shaping roller, so that the end of the tape can be adapted to the step of the band edge or of the first section in order to be able to minimize the delta diameter 37 as well.
  • the area of the delta diameter can be after the Soldering preferably be at least partially filled by solder, so that a substantially smooth transition region is to be found outside the tube.
  • FIG. 6 shows the embodiment of the FIG. 5 again in another illustration, wherein the delta diameter 37 can be seen.
  • the darkened, reinforced lines indicate the solder cladding 38 on the tape as tubing, which is preferably provided on both sides of the strip of material.
  • FIG. 7 shows in a further embodiment, a flat tube 40 which is formed on the third side wall 41 at an angle or angled, while the tube is formed on the fourth side wall 42 with an arcuate course.
  • the region of the third side wall 41 is formed in such a way that it consists of two partial regions 43, 44 which are substantially at an acute angle, the region 43 being the double-walled region which is formed from two sections of the material strip in double-layered form, the end of the strip of material are placed on each other.
  • a first end region 45 and a second end region 46 of the material strip are angled in such a way that the two material strips are aligned parallel to one another.
  • the material strip 45 is angled ⁇ of the first side wall 47 at an angle of about 135 °, the region 48 angled from the second side wall 49 by the angle ⁇ and the region 46 angled from the region 48 in the angle ⁇ , such that the two areas 45 and 46 of the third side wall parallel to each other and double-layered side by side.
  • the end face of the area 45 either comes into contact with the area 48 or keeps a small distance thereto.
  • the inner rib 50 has at its one end an arcuate profile 51, which applies to the arcuate course of the fourth side wall of the flat tube.
  • the inner rib 50 has an angled profile 52, which is formed from two angularly mutually standing regions, wherein a region 53 rests against the region 48 of the flat tube and a region 54 bears against the region 45 of the flat tube. Between the two lateral end regions, the inner rib 50 is arranged in the region of the arches 55 such that it bears against the first or second side wall on the inside.
  • FIGS. 8 and 9 show the two end portions of the flat tube once again in an enlarged view.
  • the region 51 is substantially semicircular, arc-shaped and lays against the second side wall 56. From the semicircular, the inner rib takes a meandering course, with the resulting sheets 55 abutting each other on the first and second side wall opposite.
  • the third side wall which, as described above, is formed angled, wherein in one region of the angle, the side wall is formed in one layer and in another area of the side wall of the angle is double-layered, the inner rib angled applies to these two areas.
  • the FIG. 10 shows an end portion of a flat tube, the alternative to the embodiment of the FIGS. 7, 8 and 9 is formed at an end portion.
  • the region of the third side wall 70 is formed angled, wherein the double-layered design is carried out over both legs of the angled side wall.
  • the side wall 70 in this case has a first leg 71 and second leg 72, which are each formed from a layer 73 and 74 or 75 and 76. Starting from the first side wall 77 of the leg 76 is angled at the angle alpha and the leg 74 of Leg 76 angled away from the angle beta. Starting from the second side wall 78, the leg 73 is at the angle gamma angled whereby the leg 75 is angled away from the leg 73 again by the angle beta.
  • FIG. 11 shows a further embodiment in alternative to FIG. 10 , wherein the third side wall is again formed at least partially double-layered.
  • the leg 91 of the side wall 90 is formed double-layered and the leg 92 at least partially double-layered.
  • the leg 91 is formed by the leg 93 and the leg 94 of the material strip, wherein the leg 92 is formed by the leg 95 and the leg 96 of the material strip.
  • the leg 96 has only about half a length, preferably a partial length of the leg 95, so that the leg 96 only applies to a portion of the leg 95 at this. Furthermore, it can be seen that the rib 97 engages in the region of the leg 95 to the latter, wherein the leg 98 of the rib 97 in the region abuts the leg 95, which releases the reduced length leg 96. The legs 96 and 98 are therefore adjacent to each other on the leg 95.
  • FIG. 12 shows a further embodiment for a design of a side wall of a flat tube, wherein the side wall 100 is again formed double-layered by the legs 101 and 102, wherein the leg 101 is formed by the leg 103 and the leg 104, which is angled parallel to the first side wall 105 double-layered are arranged side by side.
  • the leg 102 is formed by the leg 106 and the leg 107, which are arranged angled relative to the second side wall 108, wherein in this embodiment, the two legs 107 and 108 not lie flat against each other, but have a distance which forms a gap, so that in this gap 109 of the end portion 110 of the rib 111 can engage.
  • FIG. 13 shows a further embodiment alternative to the embodiment of FIG. 12 ,
  • the third side wall 120 is formed by the side wall 121 and the side wall 122.
  • the side wall 121 is analogous to the side wall 101 of FIG. 12 double-layered.
  • the leg 122 of the side wall 120 is formed by the leg 123 and the leg 124, wherein the leg 124 is applied over a part of its extension to the leg 123 and spaced in another part of its extension from the latter by a gap, wherein in the Gap 125 of the legs 126 of the rib 127 extends, so that in this partial region between the leg 124 and the leg 123 of the leg 126 of the rib is arranged and soldered.
  • the FIG. 14 shows a further embodiment of a flat tube 140 in a partial view.
  • the third side wall 141 is formed by two overlapping regions 142, 143, which are each formed as an arcuate region.
  • the region 143 transitions from the straight region of the first side wall 144 with an S-shaped profile 145 into the arcuate region 143, which describes a circular arc.
  • the region 142 is likewise circular-arc-shaped and lies on the outside against the circular arc of the region 143.
  • the arc of the area 142 ends with a bevel, so that the gap 146 between the two areas 142, 143 and 145 formed as low as possible and preferably wedge-shaped with a small angle of less than 30 °.
  • the distance d between the regions is also as small as possible, in particular smaller than the material thickness D.
  • FIG. 15 shows an embodiment of a flat tube 150 in section, wherein the flat tube 150 of two opposing first and second side walls 151, 152 and two opposing third and fourth side walls 153, 154, wherein the third and fourth side walls 153, 154, the first and second Side walls 151, 152 connect together.
  • the side 154 connects as the fourth side
  • the third side wall 153 connects the two first and second side walls 2151 and 152 in the embodiment on the left side.
  • the flat tube 150 can be seen as such, which means that the third and fourth side walls 153, 154 are significantly shorter in their extension than the extent of the first and second side walls 151, 152.
  • the first, the second and the fourth side wall 151, 152, 154 each formed in one layer, wherein the third side wall 153 is formed by two portions 155, 166 of the material strip 157 of the flat tube, which adjacent to each other a kind of double wall in form two-ply copy.
  • the third and fourth side walls 153, 154 are designed arcuate. Arcuate may preferably mean semi-circular or otherwise curved.
  • the third side wall 153 in this case has an inner wall and an outer wall, wherein the inner wall, starting from the first side wall 151 merges with a step in the arcuate contour, so that the outer side wall rests in the region of this stage with its end.
  • the FIG. 15 shows the inner fin 160, which is inserted into the flat tube 150.
  • the shape of the inner rib 160 is such that an arcuate contour is provided at one of the two end portions 164, while at the other end portion 163, the inner rib just ends. Between End regions 163, 164, a meander-shaped contour 165 is provided with webs and bows. This causes the inner fin 160 to abut one of the arcuate contours of the flat tube with its one arcuate contour in the region 164, while the straight region 163 laterally abuts the region 155.

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  • 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)
  • Rigid Pipes And Flexible Pipes (AREA)

Description

Technisches GebietTechnical area

Die Erfindung betrifft ein Flachrohr, insbesondere für einen Wärmeübertrager, aus einem flächigen Materialstreifen mit zwei sich gegenüberliegenden ersten und zweiten Seitenwänden, die mittels dritten und vierten Seitenwänden miteinander verbunden sind. Auch betrifft die Erfindung einen Wärmeübertrager mit einem solchen Flachrohr.The invention relates to a flat tube, in particular for a heat exchanger, of a flat strip of material with two opposing first and second side walls, which are interconnected by means of third and fourth side walls. The invention also relates to a heat exchanger with such a flat tube.

Stand der TechnikState of the art

Flachrohre für Wärmeübertrager sind in vielerlei Konfigurationen im Stand der Technik bekannt. So sind beispielsweise extrudierte Flachrohre mit einer Vielzahl von Stegen zur Bildung einzelner Fluidkanäle für Kondensatoren oder Verdampfer hinlänglich bekannt.Flat tubes for heat exchangers are known in many configurations in the prior art. For example, extruded flat tubes with a plurality of webs for the formation of individual fluid channels for capacitors or evaporators are well known.

Auch sind sogenannte Stegrohre bekannt, bei welchen ein Metallstreifen durch Falzung beispielsweise zu einem Ein- oder Mehrkammerrohr, wie beispielsweise B-Rohr, umgefalzt wird. Diese Falzrohre werden dabei typischerweise erst durch den Lötprozess zur Lötung des gesamten Wärmeübertragers abgedichtet und weisen zumindest ein oder zwei Fluidkammern auf, durch welche ein Medium strömen kann.Also, so-called straw tubes are known in which a metal strip is folded by folding, for example, to a single or multi-chamber tube, such as B-tube. These folding tubes are typically first sealed by the soldering process for soldering the entire heat exchanger and have at least one or two fluid chambers, through which a medium can flow.

Die DE 102006054814 A1 offenbart ein gelötetes Flachrohr für Kondensatoren oder Verdampfer, bei welchen das Rohr aus zwei Halbschalen gebildet wird, die an den kurzen Seiten überlappen und dort verlötet sind, wobei im Innenraum eine Rippe derart angeordnet ist, dass diese Rippe ebenfalls im sich überlappenden Rohrbereich anliegt und dort mit der Rohrwand verlötet ist.The DE 102006054814 A1 discloses a soldered flat tube for capacitors or evaporators, in which the tube is formed of two half-shells, which overlap on the short sides and are soldered there, wherein in the interior a rib is arranged such that this rib also in the overlapping tube portion is present and there is soldered to the pipe wall.

Diese Ausgestaltung zeigt jedoch Probleme bezüglich der doch eher komplexen Herstellbarkeit und hinsichtlich der dadurch hervorgerufenen Kosten, da die Fertigung des mehrteiligen Rohrs mit Innenrippe einen erhöhten Fertigungsaufwand bedeutet, sowohl bei der Herstellung als auch bei der Montage der zumindest drei Teile, die zu einem Rohr verbunden werden.However, this embodiment presents problems in terms of rather complex manufacturability and in terms of costs caused thereby, since the production of the multi-part tube with inner fin means increased manufacturing costs, both during manufacture and during assembly of at least three parts connected to a pipe become.

Die DE 102006050319 A1 offenbart ein Flachrohr, das aus einem Blechstreifen gebildet ist, wobei der Blechstreifen derart umgebogen wird, dass der Verschluss des Blechstreifens an einer kurzen Seite des Rohres angeordnet ist. Im Inneren des Rohres ist ebenso eine Rippe angeordnet, die im Bereich der Verbindung der Blechseitenkanten zwischen diese Seitenkanten aufgenommen ist.The DE 102006050319 A1 discloses a flat tube formed from a sheet metal strip, wherein the sheet metal strip is bent such that the closure of the sheet metal strip is arranged on a short side of the tube. Inside the tube, a rib is also arranged, which is received in the region of the connection of the sheet side edges between these side edges.

Diese Rohrgestaltung hat Nachteile hinsichtlich des ausgenutzten Platzbedarfes, da durch den seitlichen Verschluss des Rohres der Raumbereich, der für den Innenraum des Rohres zur Verfügung steht, beschränkt ist.
Die EP 1243884 A2 offenbart ein Flachrohr, das aus einem Blechstreifen gebildet ist, wobei ein mittlerer Steg ausgebildet ist, der durch eine hakenartige Umformung der Randbereiche des Blechstreifens gebildet ist, wobei im Innenraum des Rohres eine Wellrippe angeordnet ist.
Die Rohrgestaltung der EP 1243884 A2 weist den Nachteil auf, dass die Innendruckstabilität insbesondere im zentralen Bereich des Steges nicht optimal ausgeprägt ist und insbesondere im Bereich der Lötstelle es zu Undichtigkeiten bei Anwendungen unter höheren Drücken kommen kann.This tube design has disadvantages in terms of the space required, since the lateral closure of the tube of the Space, which is available for the interior of the pipe is limited.
The EP 1243884 A2 discloses a flat tube, which is formed from a metal strip, wherein a central web is formed, which is formed by a hook-like deformation of the edge regions of the metal strip, wherein a corrugated fin is arranged in the interior of the tube.
The tube design of the EP 1243884 A2 has the disadvantage that the internal pressure stability is not optimally pronounced, in particular in the central region of the web, and in particular in the area of the solder joint, leaks may occur in applications under higher pressures.

Die DE 10 2006 035 210 offenbart ein Flachrohr, das aus einem gefalteten flächigen Materialstreifen gebildet ist. An einer der Schmalseiten ist der Materialstreifen doppellagig aneinander angelegt. Eine im Innenraum des Flachrohrs angeordnete Innenrippe legt sich endseitig an der Innenwand der Schmalseiten an.The DE 10 2006 035 210 discloses a flat tube formed from a folded sheet of material. On one of the narrow sides of the material strip is double-layered together. An inner rib arranged in the interior of the flat tube abuts against the inner wall of the narrow sides at the end.

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

Es ist die Aufgabe der Erfindung, ein Flachrohr und einen Wärmeübertrager mit einem Flachrohr zu schaffen, wobei das Flachrohr einfach herstellbar und dennoch mit einer erhöhten Druckstabilität ausgestattet ist. Hinsichtlich des Wärmeübertragers ist es die Aufgabe, einen solchen Wärmeübertrager zu schaffen, der eine erhöhte Druckstabilität aufweist, insbesondere auch im Bereich seiner Flachrohre.It is the object of the invention to provide a flat tube and a heat exchanger with a flat tube, wherein the flat tube is easy to produce and yet equipped with increased pressure stability. With regard to the heat exchanger, the object is to provide such a heat exchanger, which has an increased pressure stability, in particular in the region of its flat tubes.

Dies wird hinsichtlich des Flachrohrs erreicht mit den Merkmalen von Anspruch 1.This is achieved with regard to the flat tube with the features of claim 1.

Ein Ausführungsbeispiel des erfindungsgemäßen Flachrohrs sieht ein Flachrohr vor, insbesondere für einen Wärmeübertrager, aus einem flächigen Materialstreifen mit zwei sich gegenüberliegenden ersten und zweiten Seitenwänden, die mittels dritten und vierten Seitenwänden miteinander verbunden sind, wobei die dritte Seitenwand durch zwei Abschnitte des Materialstreifens gebildet ist, die doppellagig aneinander angelegt sind, wobei eine Innenrippe im Innenraum des Flachrohrs angeordnet ist, und sich an der dritten Seitenwand und an der vierten Seitenwand endseitig anlegt und zwischen der dritten Seitenwand und der vierten Seitenwand abwechselnd an der ersten Seitenwand und der zweiten Seitenwand abstützt. Dadurch kann ein hochstabiles Flachrohr erzeugt werden, welches den Anforderungen an die Stabilität und Korrosionsfestigkeit bei gleichzeitig guter Herstellbarkeit genügt.An embodiment of the flat tube according to the invention provides a flat tube, in particular for a heat exchanger, of a flat strip of material with two opposing first and second side walls, which are interconnected by third and fourth side walls, wherein the third side wall by two portions of Material strip is formed which are applied to each other in a double-ply, wherein an inner fin is disposed in the interior of the flat tube, and the end against the third side wall and the fourth side wall and between the third side wall and the fourth side wall alternately on the first side wall and the second Sidewall supported. As a result, a highly stable flat tube can be produced, which meets the requirements of stability and corrosion resistance with good manufacturability.

Dabei ist besonders bevorzugt, wenn die dritte Seitenwand eine abgewinkelte oder bogenförmige Kontur aufweist.It is particularly preferred if the third side wall has an angled or arcuate contour.

Auch ist es zweckmäßig, wenn die vierte Seitenwand eine abgewinkelte oder bogenförmige Kontur aufweist.It is also expedient if the fourth side wall has an angled or arcuate contour.

Vorteilhaft ist es, wenn die Innenrippe an ihrem einen Endbereich bogenförmig oder winkelig ausgebildet ist und an der dritten Seitenwand anliegt und an ihrem anderen Endbereich bogenförmig oder winkelig ausgebildet ist und an der vierten Seitenwand anliegt. Erfindungsgemäß ist die dritte Seitenwand mit einem inneren Abschnitt und einem äußeren Abschnitt des Materialstreifens gebildet. Erfindungsgemäß ist im Übergangsbereich von der ersten Seitenwand zu der dritten Seitenwand am inneren Abschnitt des Materialstreifens eine Schräge vorgesehen, wobei der äußere Abschnitt des Materialstreifens sich an den inneren Abschnitt des Materialstreifens anlegt und im Bereich der Schräge des inneren Abschnitts des Materialstreifens endet. Auch passt sich das Ende des äußeren Abschnitts des Materialstreifens der Kontur des inneren Abschnitts des Materialstreifens im Bereich der Schräge an und schließt im Wesentlichen bündig ab. Vorteilhaft ist es, wenn das Flachrohr mit einer Rohrbreite zwischen 9 mm und 60 mm, und/oder mit einer Rohrhöhe zwischen 1,5 mm und 30 mm, und/oder mit einer Wandstärke s des Materialstreifens zwischen 160 µm und 500 µm, und einer Wandstärke der Innenrippe zwischen 60 und 200 µm ausgebildet ist.It is advantageous if the inner rib is formed at its one end portion arcuate or angular and rests against the third side wall and is formed at its other end portion arcuate or angled and rests against the fourth side wall. According to the invention, the third side wall is formed with an inner portion and an outer portion of the material strip. According to the invention, a bevel is provided in the transition region from the first side wall to the third side wall at the inner portion of the material strip, wherein the outer portion of the material strip is attached to the inner portion of the strip of material and ends in the region of the slope of the inner portion of the material strip. Also, the end of the outer portion of the strip of material conforms to the contour of the inner portion of the strip of material in the area of the slope and terminates substantially flush. It is advantageous if the flat tube with a tube width between 9 mm and 60 mm, and / or with a tube height between 1.5 mm and 30 mm, and / or with a wall thickness s of the material strip between 160 .mu.m and 500 .mu.m, and a Wall thickness of the inner fin is formed between 60 and 200 microns.

Auch ist es vorteilhaft, wenn die Abmessungen der Innenrippe vor dem Einführen in den Materialstreifen größer sind als die Innenabmessungen des Materialstreifens, so dass die Innenrippe unter Vorspannung in den Materialstreifen einsetzbar ist.It is also advantageous if the dimensions of the inner rib before insertion into the strip of material are greater than the inner dimensions of the strip of material, so that the inner rib can be inserted under bias in the strip of material.

Weiterhin ist es zweckmäßig, wenn die Abmessungen der Innenrippe vor dem Einführen in den Materialstreifen kleiner oder gleich sind als die Innenabmessungen des Materialstreifens, so dass die Innenrippe ohne Vorspannung in den Materialstreifen einsetzbar ist.Furthermore, it is expedient if the dimensions of the inner rib before insertion into the strip of material are smaller than or equal to the inner dimensions of the strip of material, so that the inner rib can be inserted without bias in the strip of material.

Die Aufgabe zum Wärmeübertrager wird gelöst mit den Merkmalen von Anspruch 8. Weitere vorteilhafte Ausgestaltungen sind durch die nachfolgende Figurenbeschreibung und durch die Unteransprüche beschrieben.The object of the heat exchanger is achieved with the features of claim 8. Further advantageous embodiments are described by the following description of the figures and by the subclaims.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

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

Figur 1
eine Ansicht eines Wärmeübertragers, wie insbesondere eines Verdampfers, mit erfindungsgemäßen Flachrohren.
Figur 2
eine Ansicht eines Schnitts durch einen Teilbereich eines Verdampfers, bei dem erfindungsgemäße Flachrohre und benachbart dazu angeordnete Wellrippen zu erkennen sind,
Figur 3a
einen Schnitt durch ein erfindungsgemäßes Flachrohr ohne Innenrippe,
Figur 3b
einen Schnitt durch eine Innenrippe eines Flachrohrs,
Figur 4
einen Schnitt durch ein Flachrohr gemäß Figur 3a mit Innenrippe gemäß Figur 3b,
Figur 5
ein Detail gemäß Figur 4,
Figur 6
ein Detail gemäß Figur 4,
Figur 7
einen Schnitt durch ein nicht erfindungsgemäßes Ausführungsbeispiel eines Flachrohrs,
Figur 8
ein Detail gemäß Figur 7,
Figur 9
ein Detail gemäß Figur 7,
Figur 10
einen Schnitt durch einen Teilbereich eines nicht erfindungsgemäßen Ausführungsbeispiels eines Flachrohrs,
Figur 11
einen Schnitt durch einen Teilbereich eines nicht erfindungsgemäßen Ausführungsbeispiels eines Flachrohrs,
Figur 12
einen Schnitt durch einen Teilbereich eines nicht erfindungsgemäßen Ausführungsbeispiels eines Flachrohrs,
Figur 13
einen Schnitt durch einen Teilbereich eines nicht erfindungsgemäßen Ausführungsbeispiels eines Flachrohrs,
Figur 14
einen Schnitt durch einen Teilbereich eines nicht erfindungsgemäßen Ausführungsbeispiels eines Flachrohrs, und
Figur 15
einen Schnitt durch ein nicht erfindungsgemäßes Ausführungsbeispiel eines Flachrohrs.
The invention will be explained in more detail on the basis of at least one embodiment with reference to the drawings. Show it:
FIG. 1
a view of a heat exchanger, in particular an evaporator, with flat tubes according to the invention.
FIG. 2
3 a view of a section through a partial region of an evaporator, in which flat tubes according to the invention and corrugated ribs arranged adjacent thereto can be seen,
FIG. 3a
a section through an inventive flat tube without inner rib,
FIG. 3b
a section through an inner rib of a flat tube,
FIG. 4
a section through a flat tube according to FIG. 3a with inner rib according to FIG. 3b .
FIG. 5
a detail according to FIG. 4 .
FIG. 6
a detail according to FIG. 4 .
FIG. 7
a section through a non-inventive embodiment of a flat tube,
FIG. 8
a detail according to FIG. 7 .
FIG. 9
a detail according to FIG. 7 .
FIG. 10
a section through a portion of a non-inventive embodiment of a flat tube,
FIG. 11
a section through a portion of a non-inventive embodiment of a flat tube,
FIG. 12
a section through a portion of a non-inventive embodiment of a flat tube,
FIG. 13
a section through a portion of a non-inventive embodiment of a flat tube,
FIG. 14
a section through a portion of a non-inventive embodiment of a flat tube, and
FIG. 15
a section through a non-inventive embodiment of a flat tube.

Bevorzugte Ausführung der ErfindungPreferred embodiment of the invention

Die Figur 1 zeigt einen Wärmeübertrager 1, wie insbesondere einen Verdampfer, in einer perspektivischen Ansicht. Der Verdampfer 1 weist einen Rohr-Rippenblock 2 auf mit Flachrohren 3 und zwischen den Flachrohren angeordneten Rippen 4. Die Flachrohre 3 sind an ihren beiden gegenüberliegenden Enden mit den Sammelkästen 5 und 6 fluidverbunden, wobei der obere Sammelkasten 5 aus zwei Kammern 7,8 besteht, wobei die Kammer 7 die eintrittsseitige Kammer ist, die mit einem Eintrittsanschlussrohr 9 verbunden ist, wobei die Kammer 8 die Austrittskammer ist, die mit einem Auslassanschlussrohr 10 verbunden ist. Der untere Sammelkasten 6 weist vorteilhaft zumindest eine Kammer auf, die eine Umlenkung in der Tiefe bewirkt. Der Einlassanschluss ist vorzugsweise seitlich an der kurzen Seite des Sammelkastens angeordnet und bevorzugt an der Leeseite des Wärmeübertragers. Der Auslassanschluss ist vorzugsweise frontal an einer langen Seite des Sammelkastens angeordnet und bevorzugt an der Luvseite des Wärmeübertragers.The FIG. 1 shows a heat exchanger 1, in particular an evaporator, in a perspective view. The evaporator 1 has a tube-fin block 2 with flat tubes 3 and arranged between the flat tubes ribs 4. The flat tubes 3 are fluidly connected at its two opposite ends with the manifolds 5 and 6, wherein the upper header box 5 consists of two chambers 7.8 , wherein the chamber 7 is the inlet-side chamber, which is connected to an inlet connection pipe 9, wherein the chamber 8 is the outlet chamber, which is connected to an outlet connection pipe 10. The lower collection box 6 advantageously has at least one chamber which effects a deflection in the depth. The inlet port is preferably located laterally on the short side of the header tank and preferably on the leeward side of the heat exchanger. The outlet port is preferably at a frontal arranged long side of the header tank and preferably on the windward side of the heat exchanger.

Die Figur 2 zeigt einen Schnitt durch den Rohrippenblock 2 der Figur 1, wobei die Flachrohre 3 und die Wellrippen 4 abwechselnd nebeneinander angeordnet sind. Die Flachrohre 3 sind dabei im Schnitt dargestellt, so dass das Fluid, welches durch die Flachrohre 3 strömt, quasi senkrecht zur Zeichenebene durch die Rohre strömt. Die Wellrippen sind nur schematisch dargestellt, wobei die Wellrippen quasi parallel zur Zeichenebene von Luft durchströmt werden.The FIG. 2 shows a section through the tube block 2 of the FIG. 1 , wherein the flat tubes 3 and the corrugated fins 4 are arranged alternately side by side. The flat tubes 3 are shown in section, so that the fluid flowing through the flat tubes 3, flows quasi perpendicular to the plane through the tubes. The corrugated fins are shown only schematically, wherein the corrugated fins are traversed quasi-parallel to the plane of air.

Die Figur 3a zeigt ein Flachrohr 20 im Schnitt, wobei das Flachrohr aus zwei sich gegenüberliegenden ersten und zweiten Seitenwänden 21, 22 sowie zwei sich gegenüberliegenden dritten und vierten Seitenwänden 23, 24 besteht, wobei die dritten und vierten Seitenwände 23, 24 die ersten und zweiten Seitenwände 21, 22 miteinander verbinden. So verbindet die Seite 24 als vierte Seite die beiden ersten und zweiten Seitenwände 21 und 22 im Ausführungsbeispiel der Figur 3a auf der linken Seite und die dritte Seitenwand 23 verbindet die beiden ersten und zweiten Seitenwände 21 und 22 im Ausführungsbeispiel auf der rechten Seite. Das Flachrohr ist als solches zu erkennen, was bedeutet, dass die dritten und vierten Seitenwände 23, 24 in ihrer Erstreckung deutlich kürzer sind als die Erstreckung der ersten und zweiten Seitenwände 21, 22.The FIG. 3a shows a flat tube 20 in section, wherein the flat tube of two opposing first and second side walls 21, 22 and two opposing third and fourth side walls 23, 24, wherein the third and fourth side walls 23, 24, the first and second side walls 21, 22 connect together. Thus, the side 24 connects as a fourth side, the two first and second side walls 21 and 22 in the embodiment of FIG. 3a on the left side and the third side wall 23 connects the two first and second side walls 21 and 22 in the embodiment on the right side. The flat tube can be recognized as such, which means that the third and fourth side walls 23, 24 are significantly shorter in their extension than the extension of the first and second side walls 21, 22.

Wie zu erkennen ist, ist die erste, die zweite und die vierte Seitenwand 21, 22, 24 jeweils einlagig ausgebildet, wobei die dritte Seitenwand 23 durch zwei Abschnitte 25, 26 des Materialstreifens 27 des Flachrohres gebildet ist, die aneinander anliegend eine Art Doppelwandung in doppellagiger Ausfertigung bilden. Dabei ist es im Ausführungsbeispiel der Figur 3a vorteilhaft, dass die dritten und vierten Seitenwände 23, 24 bogenförmig gestaltet sind. Bogenförmig kann vorzugsweise halbkreisförmig oder anderweitig gebogen bedeuten. Die dritte Seitenwand 23 weist dabei eine innere Wandung und eine äußere Wandung auf, wobei die innere Wandung ausgehend von der ersten Seitenwand 21 mit einer Stufe in die bogenförmige Kontur übergeht, so dass die äußere Seitenwand im Bereich dieser Stufe mit ihrem Endbereich anliegt. Die innere axiale Länge BV ist durch den Pfeil dargestellt.As can be seen, the first, the second and the fourth side wall 21, 22, 24 each formed a single layer, wherein the third side wall 23 is formed by two portions 25, 26 of the material strip 27 of the flat tube, which adjacent to each other a kind of double wall in form two-ply copy. It is in the embodiment of FIG. 3a advantageous that the third and fourth side walls 23, 24 are designed arcuate. Arched may preferably be semi-circular or otherwise bent mean. The third side wall 23 in this case has an inner wall and an outer wall, wherein the inner wall, starting from the first side wall 21 merges with a step in the arcuate contour, so that the outer side wall rests in the region of this stage with its end. The inner axial length B V is shown by the arrow.

Die Rohrbreite, also die äußere Ausdehnung in lateraler Richtung, also Bv plus die Wandstärken der jeweiligen dritten und vierten Seitenwand 23, 24 beträgt bevorzugt zwischen 9 mm und 60 mm, besonders vorteilhaft zwischen 10 mm und 30 mm. Dabei ist die Rohrbreite als BR bezeichnet. Die Rohrhöhe H beträgt vorteilhaft zwischen 1,5 mm und 30 mm. Die Wandstärke s der Außenkontur beträgt zwischen 160 µm und 500 µm, bevorzugt 180 µm bis 250 µm.The tube width, ie the outer extent in the lateral direction, ie B v plus the wall thicknesses of the respective third and fourth side wall 23, 24, is preferably between 9 mm and 60 mm, particularly advantageously between 10 mm and 30 mm. The tube width is referred to as B R. The tube height H is advantageously between 1.5 mm and 30 mm. The wall thickness s of the outer contour is between 160 μm and 500 μm, preferably 180 μm to 250 μm.

Die Figur 3b zeigt die Innenrippe, welche zur Einführung in das Flachrohr 20 vorgesehen ist. Dabei ist die Innenrippe 30 in einer Länge BU ausgebildet, die länger ist als die Innenlänge BV des Flachrohres. Wird nun die Innenrippe 30 in das Flachrohr 20 eingeschoben, so wird diese gemäß den Pfeilen 31, 32 zuerst in lateraler Richtung gestaucht, so dass die Innenrippe 30 unter Vorspannung in dem Flachrohr 20 angeordnet wird. Die Gestalt der Innenrippe 30 ist derart, dass an den beiden Endbereichen 33, 34 eine bogenförmige Kontur vorgesehen ist, die in eine mäanderförmige Kontur 35 mit Stegen und Bögen übergeht. Dies bewirkt, dass die Innenrippe 30 an den bogenförmigen Konturen des Flachrohres mit seinen bogenförmigen Konturen in dem Bereich 33, 34 anliegt und die Bögen 36 der mäanderförmigen Struktur 35 sich an die ersten und zweiten Seitenwände des Flachrohres innen anlegen. Dadurch entsteht ein Flachrohr, das nach einer Verlötung eine sehr stabile Konfiguration aufweist. Die Wandstärke der Innenrippe ist bevorzugt im Bereich von 60 bis 200 µm. Die Anzahl der Stege ist bevorzugt etwa 2 bis 20.The FIG. 3b shows the inner rib, which is provided for insertion into the flat tube 20. In this case, the inner rib 30 is formed in a length B U , which is longer than the inner length B V of the flat tube. Now, if the inner rib 30 is inserted into the flat tube 20, it is first compressed in the lateral direction according to the arrows 31, 32, so that the inner rib 30 is arranged under pretension in the flat tube 20. The shape of the inner rib 30 is such that at the two end portions 33, 34 an arcuate contour is provided, which merges into a meandering contour 35 with webs and bends. This causes the inner rib 30 abuts the arcuate contours of the flat tube with its arcuate contours in the region 33, 34 and the arcs 36 of the meandering structure 35 to create the first and second side walls of the flat tube inside. This creates a flat tube that has a very stable configuration after soldering. The wall thickness of the inner fin is preferably in the range of 60 to 200 microns. The number of lands is preferably about 2 to 20.

Bei einem weiteren Ausführungsbeispiel ist es vorteilhaft, wenn die Innenrippe 30 nur an einem Rohrradius 33 anliegt. Der Bereich 34 liegt insbesondere im Überlappungsbereich des Falzes auf und ist evtl. leicht aufgestellt, so dass ein Spalt zwischen Bereich 34 und 33 entsteht.
Die Figur 4 zeigt Flachrohr 20 mit der Innenrippe 30 im montierten Zustand. Dabei liegt der bogenförmige Bereich 33 beziehungsweise der bogenförmige Bereich 34 der Innenrippe 30 am bogenförmigen Bereich der dritten und vierten Seitenwände 23, 24 des Flachrohres 20 innen flächig an. Die Bögen 36 liegen an der im Wesentlichen ebenen Innenseite der ersten und zweiten Seitenflächen 21, 22 des Flachrohres 20 innen an.
Die Figur 5 zeigt in einem vergrößerten Detail den Endbereich mit der dritten Seitenwand 23, die doppellagig ausgebildet ist. Dabei ist die innere Bandkante beziehungsweise der innere Abschnitt 26 des Materialstreifens 27 durch eine Stufe oder durch einen abgewinkelten Abschnitt derart ausgebildet, dass er ab dieser Stufe beziehungsweise dieser Abwinkelung von der Ebene bzw. Geraden der ersten Seitenwand 21 abweicht und in den bogenförmigen Endbereich 28 übergeht. Die äußere Bandkante beziehungsweise der äußere Abschnitt 25 des Materialstreifens 27 ist im Bereich seiner Bandkante derart abgeschrägt, dass im Berührbereich zwischen der ersten und der zweiten Bandkante beziehungsweise im Berührbereich des Endes des ersten Abschnitts mit der Stufe des zweiten Abschnitts eine Abschrägung oder Abrundung erfolgt, so dass eine Anpassung der Schräge in diesem Bereich vorzufinden ist.
Die Anpassung des Endes des Bandes erfolgt mit Hilfe einer Formrolle, so dass das Ende des Bandes an die Stufe der Bandkante beziehungsweise des ersten Abschnitts angepasst werden kann, um auch den Deltadurchmesser 37 minimieren zu können. Der Bereich des Deltadurchmessers kann nach dem Lötprozess bevorzugt zumindest teilweise durch Lot ausgefüllt sein, so dass ein im Wesentlichen glatter Übergangsbereich außen am Rohr vorzufinden ist.In a further embodiment, it is advantageous if the inner rib 30 rests only on a tube radius 33. The region 34 lies in particular in the overlapping region of the fold and may possibly be set up slightly, so that a gap is created between region 34 and 33.
The FIG. 4 shows flat tube 20 with the inner rib 30 in the assembled state. In this case, the arcuate region 33 or the arcuate region 34 of the inner rib 30 is located on the arcuate region of the third and fourth side walls 23, 24 of the flat tube 20 inside flat. The sheets 36 abut on the substantially flat inner side of the first and second side surfaces 21, 22 of the flat tube 20 inside.
The FIG. 5 shows in an enlarged detail the end portion with the third side wall 23, which is formed double-layered. In this case, the inner band edge or the inner portion 26 of the material strip 27 is formed by a step or by an angled portion such that it deviates from this level or this bend from the plane or straight line of the first side wall 21 and merges into the arcuate end portion 28 , The outer band edge or the outer portion 25 of the material strip 27 is chamfered in the region of its band edge such that in the contact region between the first and the second band edge or in the contact region of the end of the first section with the step of the second section, a chamfering or rounding, so that an adjustment of the slope is found in this area.
The adaptation of the end of the tape is carried out with the aid of a shaping roller, so that the end of the tape can be adapted to the step of the band edge or of the first section in order to be able to minimize the delta diameter 37 as well. The area of the delta diameter can be after the Soldering preferably be at least partially filled by solder, so that a substantially smooth transition region is to be found outside the tube.

Die Figur 6 zeigt das Ausführungsbeispiel der Figur 5 noch einmal in einer weiteren Darstellung, wobei der Deltadurchmesser 37 zu erkennen ist. Die dunkel ausgeführten, verstärkten Linien deuten die Lotplattierung 38 auf dem Band als Rohrmaterial an, die bevorzugt auf beiden Seiten des Materialstreifens vorgesehen ist. Dadurch kann eine optimierte Verlötung des doppellagigen Wandbereichs stattfinden, wobei auch eine Verlötung mit der Innenrippe, die bevorzugt nicht mit einer Lotplattierung versehen ist, erfolgen kann.The FIG. 6 shows the embodiment of the FIG. 5 again in another illustration, wherein the delta diameter 37 can be seen. The darkened, reinforced lines indicate the solder cladding 38 on the tape as tubing, which is preferably provided on both sides of the strip of material. As a result, an optimized soldering of the double-layered wall region can take place, whereby a soldering with the inner rib, which is preferably not provided with a solder plating, can take place.

Die Figur 7 zeigt in einem weiteren Ausführungsbeispiel ein Flachrohr 40, welches an der dritten Seitenwand 41 winklig oder abgewinkelt ausgebildet ist, während das Rohr an der vierten Seitenwand 42 mit einem bogenförmigen Verlauf ausgebildet ist. Der Bereich der dritten Seitenwand 41 ist derart ausgebildet, dass er aus zwei im Wesentlichen in einem spitzen Winkel zueinander stehenden Teilbereichen 43, 44 besteht, wobei der Bereich 43 der doppelwandig beziehungsweise doppellagig gebildete Bereich ist, der aus zwei Abschnitten des Materialstreifens doppellagig gebildet wird, die endseitig des Materialstreifens aufeinander gelegt sind. Dazu ist ein erster Endbereich 45 und ein zweiter Endbereich 46 des Materialstreifens derart abgewinkelt, dass die beiden Materialstreifen parallel zueinander ausgerichtet sind. Hierzu ist der Materialstreifen 45 von der ersten Seitenwand 47 in einem Winkel α von etwa 135° abgewinkelt, der Bereich 48 von der zweiten Seitenwand 49 um den Winkel β abgewinkelt und der Bereich 46 vom Bereich 48 in den Winkel γ abgewinkelt, derart, dass die beiden Bereiche 45 und 46 der dritten Seitenwand parallel zueinander und doppellagig nebeneinander liegen. Die Stirnfläche des Bereichs 45 kommt dabei entweder in Anlage an den Bereich 48 oder behält einen geringen Abstand dazu.The FIG. 7 shows in a further embodiment, a flat tube 40 which is formed on the third side wall 41 at an angle or angled, while the tube is formed on the fourth side wall 42 with an arcuate course. The region of the third side wall 41 is formed in such a way that it consists of two partial regions 43, 44 which are substantially at an acute angle, the region 43 being the double-walled region which is formed from two sections of the material strip in double-layered form, the end of the strip of material are placed on each other. For this purpose, a first end region 45 and a second end region 46 of the material strip are angled in such a way that the two material strips are aligned parallel to one another. For this purpose, the material strip 45 is angled α of the first side wall 47 at an angle of about 135 °, the region 48 angled from the second side wall 49 by the angle β and the region 46 angled from the region 48 in the angle γ, such that the two areas 45 and 46 of the third side wall parallel to each other and double-layered side by side. The end face of the area 45 either comes into contact with the area 48 or keeps a small distance thereto.

Die Innenrippe 50 weist an ihrem einen Ende einen bogenförmigen Verlauf 51 auf, der sich an dem bogenförmigen Verlauf der vierten Seitenwand des Flachrohres anlegt. Am gegenüber liegenden Ende weist die Innenrippe 50 einen abgewinkelten Verlauf 52, der aus zwei winklig zueinander stehenden Bereichen gebildet ist, wobei ein Bereich 53 an dem Bereich 48 des Flachrohrs anliegt und ein Bereich 54 an dem Bereich 45 des Flachrohres anliegt. Zwischen den beiden lateralen Endbereichen ist die Innenrippe 50 im Bereich der Bögen 55 so angeordnet, dass diese sich innen an der ersten beziehungsweise zweiten Seitenwand anlegt.The inner rib 50 has at its one end an arcuate profile 51, which applies to the arcuate course of the fourth side wall of the flat tube. At the opposite end, the inner rib 50 has an angled profile 52, which is formed from two angularly mutually standing regions, wherein a region 53 rests against the region 48 of the flat tube and a region 54 bears against the region 45 of the flat tube. Between the two lateral end regions, the inner rib 50 is arranged in the region of the arches 55 such that it bears against the first or second side wall on the inside.

Die Figuren 8 und 9 zeigen die beiden Endbereiche des Flachrohres noch einmal in einer vergrößerten Darstellung. Der Bereich 51 ist dabei im Wesentlichen halbkreisförmig, bogenförmig ausgebildet und legt sich an die zweite Seitenwand 56 an. Ab dem halbkreisförmigen nimmt die Innenrippe einen mäanderförmigen Verlauf, wobei die sich daraus ergebenden Bögen 55 jeweils an der ersten und zweiten Seitenwand gegenüberliegend anliegen. Im Bereich der dritten Seitenwand, die, wie oben geschildert, winklig ausgebildet ist, wobei in einem Bereich des Winkels die Seitenwand einlagig ausgebildet ist und in einem anderen Bereich der Seitenwand der Winkel doppellagig ausgebildet ist, sich die Innenrippe winklig an diese beiden Bereiche anlegt.The FIGS. 8 and 9 show the two end portions of the flat tube once again in an enlarged view. The region 51 is substantially semicircular, arc-shaped and lays against the second side wall 56. From the semicircular, the inner rib takes a meandering course, with the resulting sheets 55 abutting each other on the first and second side wall opposite. In the region of the third side wall, which, as described above, is formed angled, wherein in one region of the angle, the side wall is formed in one layer and in another area of the side wall of the angle is double-layered, the inner rib angled applies to these two areas.

Die Figur 10 zeigt einen Endbereich eines Flachrohres, das alternativ zu dem Ausführungsbeispiel der Figuren 7, 8 und 9 an einem Endbereich ausgebildet ist. Dabei ist der Bereich der dritten Seitenwand 70 abgewinkelt ausgebildet, wobei die doppellagige Ausgestaltung über beide Schenkel der winkligen Seitenwand ausgeführt ist. Die Seitenwand 70 weist dabei einen ersten Schenkel 71 und zweiten Schenkel 72 auf, die jeweils gebildet sind aus einer Lage 73 und 74 beziehungsweise 75 und 76. Ausgehend von der ersten Seitenwand 77 ist der Schenkel 76 um den Winkel Alpha abgewinkelt und der Schenkel 74 vom Schenkel 76 um den Winkel Beta abgewinkelt. Ausgehend von der zweiten Seitenwand 78 ist der Schenkel 73 um den Winkel Gamma abgewinkelt wobei der Schenkel 75 von dem Schenkel 73 wiederum um den Winkel Beta abgewinkelt ist. Das bewirkt, dass die Schenkel 73 und 74 flächig aneinander anliegen und die Schenkel 75 und 76 ebenso flächig aneinander anliegen. Die Innenrippe 79 liegt mit ihrem Endbereich 80 im Bereich des Schenkels 76 flächig an.
Die Figur 11 zeigt eine weitere Ausführungsform in Alternative zu Figur 10, wobei die dritte Seitenwand wiederum zumindest teilweise doppellagig ausgebildet ist. Dazu ist der Schenkel 91 der Seitenwand 90 doppellagig ausgebildet und der Schenkel 92 zumindest teilweise doppellagig. Der Schenkel 91 wird gebildet durch den Schenkel 93 und den Schenkel 94 des Materialstreifens, wobei der Schenkel 92 gebildet wird durch den Schenkel 95 und den Schenkel 96 des Materialstreifens. Es ist zu erkennen, dass der Schenkel 96 nur etwa eine halbe Länge, bevorzugt eine Teillänge des Schenkels 95 aufweist, so dass der Schenkel 96 sich nur über einen Teilbereich des Schenkels 95 an diesen anlegt. Weiterhin ist zu erkennen, dass die Rippe 97 sich im Bereich des Schenkels 95 an diesen anlegt, wobei der Schenkel 98 der Rippe 97 in dem Bereich an den Schenkel 95 anliegt, den der in der Länge reduzierte Schenkel 96 freigibt. Die Schenkel 96 und 98 liegen daher nebeneinander am Schenkel 95 an.
Die Figur 12 zeigt ein weiteres Ausführungsbeispiel für eine Gestaltung einer Seitenwand eines Flachrohres, wobei die Seitenwand 100 wiederum doppellagig gebildet ist durch die Schenkel 101 und 102, wobei der Schenkel 101 gebildet ist durch den Schenkel 103 und den Schenkel 104, die abgewinkelt zur ersten Seitenwand 105 doppellagig parallel nebeneinander liegend angeordnet sind.
Der Schenkel 102 wird gebildet durch den Schenkel 106 und den Schenkel 107, die gegenüber der zweiten Seitenwand 108 abgewinkelt angeordnet sind, wobei in diesem Ausführungsbeispiel die beiden Schenkel 107 und 108 nicht flächig aneinander anliegen, sondern einen Abstand aufweisen, der einen Spalt bildet, so dass in diesen Spalt 109 der Endbereich 110 der Rippe 111 eingreifen kann. Dies bewirkt, dass zwischen dem Schenkel 106 und dem Schenkel 107 der Seitenwand der Schenkel 110 der Rippe eingefügt und verlötet werden kann.
Die Figur 13 zeigt ein weiteres Ausführungsbeispiel alternativ zum Ausführungsbeispiel der Figur 12, wobei in diesem Ausführungsbeispiel die dritte Seitenwand 120 gebildet wird durch die Seitenwand 121 und die Seitenwand 122. Die Seitenwand 121 ist analog zur Seitenwand 101 der Figur 12 doppellagig ausgebildet. Der Schenkel 122 der Seitenwand 120 wird gebildet durch den Schenkel 123 und den Schenkel 124, wobei der Schenkel 124 sich über einen Teil seiner Erstreckung an den Schenkel 123 anlegt und in einem anderen Teil seiner Erstreckung von diesem durch einen Spalt beabstandet ist, wobei in den Spalt 125 der Schenkel 126 der Rippe 127 sich erstreckt, so dass in diesem Teilbereich zwischen dem Schenkel 124 und dem Schenkel 123 der Schenkel 126 der Rippe angeordnet und verlötet ist.The FIG. 10 shows an end portion of a flat tube, the alternative to the embodiment of the FIGS. 7, 8 and 9 is formed at an end portion. In this case, the region of the third side wall 70 is formed angled, wherein the double-layered design is carried out over both legs of the angled side wall. The side wall 70 in this case has a first leg 71 and second leg 72, which are each formed from a layer 73 and 74 or 75 and 76. Starting from the first side wall 77 of the leg 76 is angled at the angle alpha and the leg 74 of Leg 76 angled away from the angle beta. Starting from the second side wall 78, the leg 73 is at the angle gamma angled whereby the leg 75 is angled away from the leg 73 again by the angle beta. This causes the legs 73 and 74 abut flat against each other and the legs 75 and 76 also lie flat against each other. The inner rib 79 lies flat with its end region 80 in the region of the leg 76.
The FIG. 11 shows a further embodiment in alternative to FIG. 10 , wherein the third side wall is again formed at least partially double-layered. For this purpose, the leg 91 of the side wall 90 is formed double-layered and the leg 92 at least partially double-layered. The leg 91 is formed by the leg 93 and the leg 94 of the material strip, wherein the leg 92 is formed by the leg 95 and the leg 96 of the material strip. It can be seen that the leg 96 has only about half a length, preferably a partial length of the leg 95, so that the leg 96 only applies to a portion of the leg 95 at this. Furthermore, it can be seen that the rib 97 engages in the region of the leg 95 to the latter, wherein the leg 98 of the rib 97 in the region abuts the leg 95, which releases the reduced length leg 96. The legs 96 and 98 are therefore adjacent to each other on the leg 95.
The FIG. 12 shows a further embodiment for a design of a side wall of a flat tube, wherein the side wall 100 is again formed double-layered by the legs 101 and 102, wherein the leg 101 is formed by the leg 103 and the leg 104, which is angled parallel to the first side wall 105 double-layered are arranged side by side.
The leg 102 is formed by the leg 106 and the leg 107, which are arranged angled relative to the second side wall 108, wherein in this embodiment, the two legs 107 and 108 not lie flat against each other, but have a distance which forms a gap, so that in this gap 109 of the end portion 110 of the rib 111 can engage. This causes between the leg 106 and the leg 107 of the side wall of the legs 110 of the rib can be inserted and soldered.
The FIG. 13 shows a further embodiment alternative to the embodiment of FIG. 12 , In this embodiment, the third side wall 120 is formed by the side wall 121 and the side wall 122. The side wall 121 is analogous to the side wall 101 of FIG. 12 double-layered. The leg 122 of the side wall 120 is formed by the leg 123 and the leg 124, wherein the leg 124 is applied over a part of its extension to the leg 123 and spaced in another part of its extension from the latter by a gap, wherein in the Gap 125 of the legs 126 of the rib 127 extends, so that in this partial region between the leg 124 and the leg 123 of the leg 126 of the rib is arranged and soldered.

Die Figur 14 zeigt ein weiteres Ausführungsbeispiel eines Flachrohrs 140 in einer Teilansicht. Die dritte Seitenwand 141 wird gebildet durch zwei überlappende Bereiche 142, 143, die jeweils als bogenförmiger Bereich ausgebildet sind. Der Bereich 143 geht von dem geraden Bereich der ersten Seitenwand 144 mit einem s-förmigen Verlauf 145 in den bogenförmigen Bereich 143 über, der einen Kreisbogen beschreibt. Der Bereich 142 ist ebenso kreisbogenförmig ausgebildet und legt sich außen an den Kreisbogen des Bereichs 143 an. Dabei endet der Kreisbogen des Bereichs 142 mit einer Abschrägung, so dass der Spalt 146 zwischen den beiden Bereichen 142, 143 bzw. 145 möglichst gering ausgebildet und bevorzugt keilförmig mit einem geringen Winkel von unter 30° ausgebildet ist. Auch ist der Abstand d zwischen den Bereichen möglichst gering, wie insbesondere kleiner als die Materialstärke D.The FIG. 14 shows a further embodiment of a flat tube 140 in a partial view. The third side wall 141 is formed by two overlapping regions 142, 143, which are each formed as an arcuate region. The region 143 transitions from the straight region of the first side wall 144 with an S-shaped profile 145 into the arcuate region 143, which describes a circular arc. The region 142 is likewise circular-arc-shaped and lies on the outside against the circular arc of the region 143. In this case, the arc of the area 142 ends with a bevel, so that the gap 146 between the two areas 142, 143 and 145 formed as low as possible and preferably wedge-shaped with a small angle of less than 30 °. The distance d between the regions is also as small as possible, in particular smaller than the material thickness D.

Die Figur 15 zeigt ein Ausführungsbeispiel eines Flachrohrs 150 im Schnitt, wobei das Flachrohr 150 aus zwei sich gegenüberliegenden ersten und zweiten Seitenwänden 151, 152 sowie zwei sich gegenüberliegenden dritten und vierten Seitenwänden 153, 154 besteht, wobei die dritten und vierten Seitenwände 153, 154 die ersten und zweiten Seitenwände 151, 152 miteinander verbinden. So verbindet die Seite 154 als vierte Seite die beiden ersten und zweiten Seitenwände 151 und 152 im Ausführungsbeispiel der Figur 15 auf der rechten Seite und die dritte Seitenwand 153 verbindet die beiden ersten und zweiten Seitenwände 2151 und 152 im Ausführungsbeispiel auf der linken Seite. Das Flachrohr 150 ist als solches zu erkennen, was bedeutet, dass die dritten und vierten Seitenwände 153, 154 in ihrer Erstreckung deutlich kürzer sind als die Erstreckung der ersten und zweiten Seitenwände 151, 152.The FIG. 15 shows an embodiment of a flat tube 150 in section, wherein the flat tube 150 of two opposing first and second side walls 151, 152 and two opposing third and fourth side walls 153, 154, wherein the third and fourth side walls 153, 154, the first and second Side walls 151, 152 connect together. Thus, the side 154 connects as the fourth side, the two first and second side walls 151 and 152 in the embodiment of FIG. 15 on the right side and the third side wall 153 connects the two first and second side walls 2151 and 152 in the embodiment on the left side. The flat tube 150 can be seen as such, which means that the third and fourth side walls 153, 154 are significantly shorter in their extension than the extent of the first and second side walls 151, 152.

Wie zu erkennen ist, ist die erste, die zweite und die vierte Seitenwand 151, 152, 154 jeweils einlagig ausgebildet, wobei die dritte Seitenwand 153 durch zwei Abschnitte 155, 166 des Materialstreifens 157 des Flachrohres gebildet ist, die aneinander anliegend eine Art Doppelwandung in doppellagiger Ausfertigung bilden. Dabei ist es im Ausführungsbeispiel der Figur 15 vorteilhaft, dass die dritten und vierten Seitenwände 153, 154 bogenförmig gestaltet sind. Bogenförmig kann vorzugsweise halbkreisförmig oder anderweitig gebogen bedeuten. Die dritte Seitenwand 153 weist dabei eine innere Wandung und eine äußere Wandung auf, wobei die innere Wandung ausgehend von der ersten Seitenwand 151 mit einer Stufe in die bogenförmige Kontur übergeht, so dass die äußere Seitenwand im Bereich dieser Stufe mit ihrem Endbereich anliegt.As can be seen, the first, the second and the fourth side wall 151, 152, 154 each formed in one layer, wherein the third side wall 153 is formed by two portions 155, 166 of the material strip 157 of the flat tube, which adjacent to each other a kind of double wall in form two-ply copy. It is in the embodiment of FIG. 15 advantageous that the third and fourth side walls 153, 154 are designed arcuate. Arcuate may preferably mean semi-circular or otherwise curved. The third side wall 153 in this case has an inner wall and an outer wall, wherein the inner wall, starting from the first side wall 151 merges with a step in the arcuate contour, so that the outer side wall rests in the region of this stage with its end.

Die Figur 15 zeigt die Innenrippe 160, welche in das Flachrohr 150 eingeführt ist. Die Gestalt der Innenrippe 160 ist derart, dass an einem der beiden Endbereiche 164 eine bogenförmige Kontur vorgesehen ist, während an dem anderen Endbereich 163 die Innenrippe gerade endet. Zwischen den Endbereichen 163, 164 ist eine mäanderförmige Kontur 165 mit Stegen und Bögen vorgesehen. Dies bewirkt, dass die Innenrippe 160 sich an einer der bogenförmigen Konturen des Flachrohrs mit seiner einen bogenförmigen Kontur in dem Bereich 164 anlegt, während sich der gerade Bereich 163 sich an dem Bereich 155 seitlich anlegt.The FIG. 15 shows the inner fin 160, which is inserted into the flat tube 150. The shape of the inner rib 160 is such that an arcuate contour is provided at one of the two end portions 164, while at the other end portion 163, the inner rib just ends. Between End regions 163, 164, a meander-shaped contour 165 is provided with webs and bows. This causes the inner fin 160 to abut one of the arcuate contours of the flat tube with its one arcuate contour in the region 164, while the straight region 163 laterally abuts the region 155.

Claims (8)

  1. A flat tube (3), in particular for a heat exchanger (1), composed of a flat material strip (27) having two mutually opposing first and second side walls (21, 22) that are connected to one another by means of third and fourth side walls (23, 24), wherein the third side wall (23) is formed by two sections (25, 26) of the material strip (27) that are positioned one against the other in a double-layer, wherein an internal fin (30) is arranged in the interior of the flat tube (20) and at its end sides is positioned against the third side wall (23) and/or against the fourth side wall (24) and, between the third side wall (23) and the fourth side wall (24), is supported alternately against the first side wall (21) and the second side wall (22), wherein in the transition region from the first side wall (21) to the third side wall (23), an incline is provided on the inner section (26) of the material strip (27), wherein the outer section (25) of the material strip (27) is positioned against the inner section (26) of the material strip (27) and terminates in the region of the incline of the inner section (26) of the material strip (27), characterised in that the end of the outer section (25) of the material strip (27) is inclined and fits the contour of the inner section (26) of the material strip (27) in the region of the incline and essentially forms a flush closure.
  2. The flat tube (20) in accordance with claim 1, characterised in that the third side wall (23) has an angled or curved contour.
  3. The flat tube (20) in accordance with claim 1 or 2, characterised in that the fourth side wall (24) has an angled or curved contour.
  4. The flat tube (20) in accordance with claim 1 or 2, characterised in that the internal fin (30) at its one end region is curved or angled and is positioned against the third side wall (23) and/or at its other end region is curved or angled and is positioned against the fourth side wall (24).
  5. The flat tube (20) in accordance with one of the preceding claims, with a tube width between 9 mm and 60 mm, and/or with a tube height between 1.5 mm and 30 mm, and/or with a wall thickness s for the material strip (27) between 160 µm and 500 µm, and a wall thickness for the inner fin (30) between 60 and 200 µm.
  6. The flat tube (20) in accordance with one of the preceding claims, characterised in that prior to insertion into the material strip (27), the dimensions of the inner fin (30) are larger than the inner dimensions of the material strip (27), such that the inner fin (30) can be inserted into the material strip (27) under pre-stress.
  7. The flat tube (20) in accordance with one of claims 1-5, characterised in that prior to insertion into the material strip (27), the dimensions of the inner fin (30) are smaller than or equal to the inner dimensions of the material strip (27), such that the inner fin (30) can be inserted into the material strip (27) without pre-stress.
  8. A heat exchanger (1) with a tube fin block (2) having a plurality of flat tubes that are arranged between collecting spaces (5, 6) and are in fluid communication therewith, wherein preferably corrugated fins (4) are arranged between the flat tubes of the tube rib block (2), characterised by flat tubes (20) in accordance with one of the preceding claims.
EP13732913.2A 2012-06-29 2013-06-28 Flat tube and heat exchanger having a flat tube of said type Active EP2867602B1 (en)

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DE201210211350 DE102012211350A1 (en) 2012-06-29 2012-06-29 Flat tube and heat exchanger with such a flat tube
PCT/EP2013/063618 WO2014001498A1 (en) 2012-06-29 2013-06-28 Flat tube and heat exchanger having a flat tube of said type

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US (1) US10267572B2 (en)
EP (1) EP2867602B1 (en)
KR (1) KR20150037948A (en)
CN (1) CN104583703B (en)
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BR112014031231A2 (en) 2017-06-27
CN104583703A (en) 2015-04-29
US10267572B2 (en) 2019-04-23
DE112013003181A5 (en) 2015-03-12
CN104583703B (en) 2017-01-18
US20150107811A1 (en) 2015-04-23
WO2014001498A1 (en) 2014-01-03
EP2867602A1 (en) 2015-05-06
DE102012211350A1 (en) 2014-01-02
KR20150037948A (en) 2015-04-08

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