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
  • F28F1/02—Tubular elements of cross-section which is non-circular
  • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/08—Making tubes with welded or soldered seams
  • B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/08—Making tubes with welded or soldered seams
  • B21C37/083—Supply, or operations combined with supply, of strip material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/15—Making tubes of special shape; Making tube fittings
  • B21C37/151—Making tubes with multiple passages
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D53/00—Making other particular articles
  • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
  • B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/4935—Heat exchanger or boiler making

Definitions

• the present invention relates to a flat tube for a heat exchanger, in particular for a motor vehicle.
• Heat exchangers in motor vehicles such as, for example, in motor vehicle air conditioning systems, have in the prior art, in addition to collecting devices for a refrigerant, flat tubes which are provided for the forwarding of the refrigerant or other fluids.
• the flat tubes known from the state of the art have ridges or projections in their interior which cause the flat tube to be multi-channeled overall.
• EP 0 854 343 shows such Fiachrohre, which have on its outer side considerable external cavities, which are reduced drive by a complex Ver ⁇ .
• the present invention is therefore based on the object to provide a flat tube, which has projections in its interior and at the same time largely avoids recesses or Aus ⁇ savings on its outer side in the region of the projections.
• the multichannel flat tube according to the invention for a heat exchanger, in particular for a motor vehicle has a first longitudinal wall, a second longitudinal wall, which lies substantially parallel to the first longitudinal wall, and at least one curved end section.
• at least one longitudinal wall on an inner side of the material of the longitudinal wall facing the fluid flow in the interior of the flat tube is provided with a projection. trained.
• the longitudinal wall is substantially flat on its outer side facing away from the fluid in the region of the projection.
• a multi-channel tube is understood to mean that a plurality of essentially separate channels are formed in the interior of the tube.
• a flat tube is understood to mean a tube that is configured in cross-section such that it far exceeds a further expansion direction in an expansion direction.
• a longitudinal wall of the flat tube is understood to mean that wall which runs along one of the longitudinal sides. Under a formed from the material of the longitudinal wall projection is understood such a projection which is not subsequently applied to the wall, but - in particular, but not exclusively - is formed by a molding process from the wall itself.
• the region of the projection is understood to mean that geometric region of the corresponding longitudinal wall in which the projection is formed. In essence, it is understood that the outer profile in the region of the projections has no recesses or only recesses with a small cross-sectional area.
• the projection is in contact with the other longitudinal wall, that is, the projection is formed on a longitudinal wall and contacts the opposite longitudinal wall. In this way, substantially separate channels can be created within the flat tube from each other.
• the flat tube has two curved end sections. Preferably, at least one end portion is bent through substantially 180 degrees to cause the two - A -
• the second end section can also be bent in an anterior fashion for closing off the flat tube, because, for example, in the course of the production process, the respective end regions of the base material can be partially bent by a predetermined angle, in order then to be joined together at this point.
• a plurality of projections are formed on a longitudinal wall of the material of the longitudinal wall.
• projections are formed on both longitudinal walls of the material of the longitudinal walls. In this case, in a further preferred embodiment, all projections contact the respectively opposite longitudinal wall. In this way it can be achieved that, in the manufactured state, the flat tube is formed with a plurality of chambers which are substantially separated from each other.
• the distances between the projections can be chosen such that the finished flat tube has channels with a substantially constant cross-sectional area.
• the projections in such a way that they do not contact the opposite longitudinal wall, but rather a further projection arranged on the opposite longitudinal wall.
• At least one projection preferably has a plurality, particularly preferably all projections, a substantially symmetrical profile. This means that the protrusion has a symmetry which is essentially perpendicular to the plane of the longitudinal wall. with respect to which the projection is formed substantially axially symmetrical.
• the flat tubes have a depth of between 0.5 mm and 5 mm, preferably between 0.8 mm and 4 mm and particularly preferably between 1 mm and 3 mm. These respective depths depend on the actual applications in the heat exchangers to be manufactured.
• At least one wall has a wall thickness between 0.05 mm and 0.8 mm, preferably between 0.07 mm and 0.6 mm, and more preferably between 0.1 mm and 0.5 mm.
• the corresponding protrusions are preferably adapted, wherein, in particular, procedural conditions must also be taken into account.
• the present invention is further directed to a method of manufacturing a multi-channel flat tube for a heat exchanger.
• a projection having a predetermined profile is produced from a material strip by means of a first shaping unit and a second shaping unit interacting with the first shaping unit.
• the profile of the projection is changed by means of a third shaping unit and a fourth shaping unit interacting with the third shaping unit.
• a change in the profile is understood to mean that predetermined geometric changes are made to the projection or its cross section.
• a shaping unit is understood to mean a device which acts on the material to be processed in such a way that its shape is changed at least locally.
• the shaping units are preferably rollers that rotate relative to one another.
• the first and the second shaping unit are designed as mutually rotating upper and lower rollers, between which the material to be processed is arranged.
• Also in the third and fourth shaping unit are corresponding roles, between which the material to be processed is arranged.
• the rollers are preferably designed in such a way that one roller is bounded by lateral ends of the other roller in order to prevent a broadening of the material strip to be processed in the course of the deformation process.
• the rollers have a substantially cylindrical profile.
• the change of the profile in at least one procedural step preferably consists in its height and / or width being reduced.
• both the height and the width of the projection are reduced during this method step. In this way it can be achieved that the outer side of the flat tube is leveled in the region of the projection, that is, a recess is reduced in this area.
• the profile of the projection is further changed.
• the height is preferred and / or reduces the width of the profile.
• a plurality of method steps are provided in succession, in which the profile of the projection is changed continuously, wherein this change in each case at least in the reduction of the width or the height of the profile.
• Each of these method steps serves - as stated above - to achieve as much as possible an outer surface of the flat tube profile in the region of the projection.
• the profile of the projection is changed in at least four, more preferably in at least six process steps.
• the number of process steps is limited by the efficiency offered both in terms of manufacturing costs, as well as in terms of time.
• pre-centering of the projection is carried out in a further procedural step. This is preferred over a preference.
• the rotatable rollers, through which the material is carried out, preferably have a substantially constant distance from each other. In this way it is achieved that the material to be processed has a substantially constant wall thickness or thickness.
• the material of the roller is preferably matched to the material to be processed such that a diffusion of material particles is prevented.
• the width of the material strip is preferably reduced.
• the material is fed to the rolls in the form of strips of predetermined dimensions.
• Below the width of the material stripe Fens is understood to mean the expansion in the direction of the roller axis.
• a plurality of projections are formed from the strip of material.
• the required amount of additional material can preferably be obtained in a first method step by reducing the length of the strip.
• the projections are preferably formed at predetermined intervals relative to one another.
• the projections are chosen such that the flat tube produced in this way substantially has a plurality of channels with substantially the same cross-section.
• different projections are preferably subjected to different shaping stages. This means that a certain projection is already adapted in its shape, while another projection is first formed or a projection is already given its final shape, while another projection is still adapted in an intermediate step in its shape.
• a plurality of projections are produced with a few forming steps in such a way that protrusions which are already pre-formed or fully formed are no longer changed in their shape.
• a curved section is preferably produced.
• a curvature of 180 degrees is created so as to arrange the longitudinal walls substantially parallel to each other.
• FIG. 1 shows an illustration of the method according to the invention for producing a projection
• Figure 2a is an illustration of the shaping units according to the invention for producing a projection.
• Fig. 2b is an illustration of the shaping units for changing the profile of the projection
• FIG. 2c a representation of the shaping units for further modification of the profile of the projection
• Fig. 3 is an illustration for illustrating the manufacturing process for producing an even number of protrusions
• FIG. 4 shows a flat tube finished by the method illustrated in FIG. 3;
• FIG. 5 is a figure for illustrating the production of a flat tube having an odd number of protrusions
• FIG. 6 shows a flat tube produced by a method according to FIG. 5
• FIG. 6 shows a flat tube produced by a method according to FIG. 5;
• FIG. 7 shows a flat tube according to the invention in a first embodiment
• FIG. 8 shows a flat tube according to the invention in a second embodiment
• FIG. 11 shows a flat tube according to the invention for illustrating the geometric conditions.
• FIG. 1 shows the individual method steps of a method according to the invention for producing a projection.
• the individual process steps are marked with the Arabic numbers 1 to 6.
• the respective lower case letters a) to f) denote the width of the material, that is the material strip, during the manufacturing process.
• the capital letters A to F mark the end points of the material strip.
• FIG. 1 merely represents a possible variant of the method according to the invention. According to the invention, further method steps can also be provided or individual method steps can be omitted.
• the reference symbol L denotes the center line, preferably the axis of symmetry of the protrusion 9a to 9f produced.
• a pre-centering of the projection 9a is made by a preference. This is particularly advantageous if the projections or webs with large heights HA to HF to be generated.
• the strip of material or the strip 7 is reshaped in the area Z shown.
• the respective shaping units that is to say preferably the rollers, have a bead-like shape.
• the generation of the protrusion 9b in procedural step 2 produces the total width b of the strip 7, the total width b being less than the total width a, or the total width a 'in the method steps 1 and 1a.
• the height HB generated in method step 2 represents the maximum height H ma of the projection 9b, which is at least partially reduced in the course of further method steps.
• stages 2 to 6 the unwinding of the neutral fiber in zone Z remains almost constant. This means that in the region Z, essentially the same amount of material is always supplied to the shaping units or the rollers. This is achieved by appropriate design of the respective shaping stages in steps 2 to 6 by maintaining the respective total strip widths.
• the widths of the strip b to f thus remain substantially constant in the process steps 2 to 6.
• the material strip 7 is preferably held with suitable tools at the respective end points B to F.
• both the height H and the width of the projection 9 decrease, and the respective flanks 25 are steeper. Also, the radius of curvature at the tip of the respective projection 9a to 9f decreases in the course of the process. This means that the material which, by reducing the height and width, te is saved, is essentially added by the fact that the surface of the recess 11 is continuously reduced below the projection.
• the width of the strip between the starting point 33 and the end point 34 preferably remains substantially constant during the method steps 2 to 6.
• a closure of the projection or the recess 11 below the projection 11 must be achieved, that is, the respective flanks 29 of the projection are pressed against each other.
• the material 7 in the region of the projection is substantially completely covered by the corresponding regions of the shaping units.
• the projection which is still open in method step 4 can also be folded, gathered or squeezed by folding.
• the height H 0 or H E is substantially reduced, but theylonstMail ⁇ width.
• the risk of burr formation between the squeezing tools would have to be counteracted, and in addition, no ideally reduced ridge outer cavity 11 is achieved.
• a final height H F is achieved which is less than the height H U in method step 5.
• the region 11 which is still present in method step 5 is essentially closed, and therefore the smooth outer profile according to the invention achieved.
• the bandwidth or overall width of the strip e is likewise not reduced further, that is, the bandwidth f and the bandwidth e are essentially the same.
• FIG. 2 a shows the shaping units for carrying out the method according to the invention, in which it is an upper roller 21 and a lower roller 22. Between these rollers, the Flachrohrmate ⁇ rial or the material strip 7 is arranged, which is pulled in this way from the rollers through the rollers.
• the lower roller 22 has a machining projection 25 and the upper roller 21 a with respect to their shape to the machining projection 25 adapted recess. It would also be possible, conversely, to provide the upper roller with a projection and the lower roller with a recess.
• FIG. 2a shows the roller pair 21, 22 in the processing step 2 of FIG. 1, which means that the machining projection 25 and the recess 26 are adapted so that the resulting projection has the height H B.
• gaps 13a and 13b are provided. During the first process step material of the strip is still drawn into the area of the upper roll.
• FIG. 2b shows the roller pair for method step 4.
• the recess 26 is designed such that the projection reaches the illustrated height HD.
• the lower roller 22 has here no longer density of the upper roller 21 and the lower roller 22 are meanwhile reduced in width relative to the device shown in FIG. 2a.
• the lower roller 22 is designed, for example, according to the strip width b of the processing step 4 of FIG.
• the widths of the strip must be substantially constant, so that no area of the strip flows from the area of the projection into the flat area 7b of the strip ,
• Fig. 2c the apparatus for the process step 6 shown in Fig. 1 is shown.
• the lower roller 22 likewise no longer has a machining projection, and only the upper roller 21 has a recess 26. This recess is adapted so that the final height H F of the projection 9 results.
• the gap widths 13a and 13b are selected to be minimal, that is to say the material or the band must be completely covered by the two rollers 21 and 22, so that the projection 9 can be reshaped such that the region 11 below the projection 9 can be substantially completely closed and in this way also in the region of the projection 9 a smooth Outside (here underside) of the material 7 results.
• Fig. 3 shows the method in the case where a plurality of projections - more precisely, an even number of projections - to be generated.
• the individual method steps were identified here by the reference symbols I to VIII.
• a clip 31 is produced by suitably adapted upper and lower rollers, that is, rollers which have a machining projection and a recess, as shown in FIG.
• the generation of this depression is advantageous in particular when the projections to be produced are to have a comparatively large initial height HB.
• two projections 9a and 9b are produced.
• an upper roller with a corresponding recess and a lower roller with a correspondingly adapted machining projection are preferably used.
• the bandwidth is reduced from method step I with a stripe width a to method step II to a stripe width b and in step III to a stripe width c.
• two further projections 9c and 9d are produced by suitably adapted upper and lower rollers.
• the strip width c in method step III is reduced to strip width d in method step IV.
• the lower roller preferably has machining projections in the region of the projections to be newly produced.
• the further inside and then the further outward protrusions are generated.
• This is advantageous, since in this way it is possible to use material from the respective outer regions of the material strip to produce the new projections and to prevent material from being drawn in from the regions of other already produced projections.
• the method steps shown in FIG. 3 are also only examples. It would also be possible to provide significantly more process steps, as well as several forming processes.
• the method step IV can also be supplemented by further method steps in order to produce additional projections or webs.
• FIG. 4 shows a flat tube which can be produced by the method outlined in FIG.
• the flat tube 1 results in a cross section through a deformation of the strip shown in Fig. 3 at VIII. there the strip is bent 180 degrees in an area between the projections 9a and 9b, and further at the respective end portions so as to achieve the curved portions 18 and 19;
• the reference numerals 14 and 15 refer to the resulting longitudinal walls, which are arranged substantially parallel to each other.
• the projections 9a to 9d can be arranged to contact the respective opposite wall (in the case of the projections 9b and 9d the wall 15, and in the case of the projections 9a and 9c the wall 14).
• the projections 9a to 9d or their Endbe ⁇ rich soldered to the respective opposite longitudinal wall are soldered together.
• the four projections 9a to 9d shown here a flat tube with a total of five channels is realized.
• Reference numeral 41 also refers here to a substantially flat or smooth strip of material, that is a smooth belt, which has the width a.
• a projection 9a is produced.
• This projection is um ⁇ shaped in step III, wherein in this process step, the strip width a first to the width b, and this in turn to the width c, is reduced, that is, the width c is less than the width b and the width b less than the width a.
• two further projections 9b and 9c are produced.
• the generations of the individual projections 9a and 9b and 9c are offset, that is to say, whereas in the case of the projection 9a the first deformation has already taken place, the sections 9b and 9c have only been produced.
• the strip width d is further reduced with respect to the strip width c.
• the inner and then the outer projections are preferably formed first.
• the three projections 9a, 9b and 9c are further formed.
• the strip width remains essentially constant, that is, the bandwidth e substantially corresponds to the bandwidth d.
• step VI a further deformation process of the type described above takes place, that is, the height of the individual projections 9a, 9b and 9c is reduced, as well as their width; instead, the flanks are made steeper and thus the radii of curvature at the tip of the projection are lower.
• step VII the projections are narrowed even further in order finally to be closed in method step VIII.
• the individual strip widths e, f, g and h remain substantially constant.
• corner folds 42a and 42b are bent. These two corner folds lead to the production of a further projection, wherein corner folds can also be produced in a plurality of method steps.
• a flat tube is shown, which results from the lowest strip shown in Fig. 5.
• the end sections are not in the area of the bends 17 or 16
• the individual projections 9a to 9c as well as the projection resulting from the end folds 42a and 42b contact the respectively opposite longitudinal wall of the flat tube.
• a flat tube with five channels in this embodiment, a flat tube with five channels.
• the method shown in Fig. 5 (step I-VIII) can be generally used for flat tubes with an odd number of protrusions, while the method shown in Fig. 3 is preferably used for flat tubes with an even number of protrusions.
• the formation of the end folds 42a, 42b according to FIG. 6 or the end folds 18, 19 according to FIG. 4, on the other hand, is largely possible independently of the number of protrusions, in particular in a known manner.
• FIG. 7 shows a flat tube according to the invention, the individual dimensions serving for illustration.
• the illustration of the smooth or planar outer surface of the flat tube according to the invention that is, the representation of the miniaturized surface 11 under the projection 9, has been dispensed with. Also, the flanges of the projection were not shown compressed.
• the reference a refers to the distance of the webs along a longitudinal wall.
• the reference symbol K denotes the distance between two adjacent bars, which under certain circumstances form a chamber.
• Reference T denotes the thickness of the flat tube.
• the thickness T is preferably between 1 mm and 3 mm.
• the chamber or channel size is chosen here in about half as large as the web distance (distance of the projections) a.
• the minimum web spacing is at least twice as large as the width T. Therefore, the minimum chamber size or channel size is at least as great or larger than the thickness T.
• the web distance a is substantially identical to the chamber or channel size K. Also in this embodiment, the minimum web distance a is greater than the thickness T, which is also due here by the manufacturing process. Since the web distance a coincides with the channel size K, the channel size is at least twice as large as the thickness T of the flat tube.
• the individual protrusions 9 do not contact the respectively opposite longitudinal wall 14 or 15, but contact projections 9 attached to the opposite longitudinal wall. This means that the ends of the protrusions are approximately in Contact the center of the flat tube.
• the channel size K is substantially equal to the land distance a. However, in this case the minimum web spacing is greater than or equal to the thickness T of the flat tube. This also applies to the chamber size or channel size K.
• rf denotes the upper radius of curvature
• X the width of the projection at its tip
• Y the width of the projection 9 at its base
• RF the radius of curvature at the base of the projection
• R D the radius of curvature of the recess 11.
• the upper radius of curvature rf in this embodiment lies between 0 and the wall thickness t, ie is smaller than the wall thickness t.
• the lower radius of curvature RF is less than twice the wall thickness t.
• the upper width X of the projection is between one and a half times and twice the wall thickness t.
• the lower width Y of the projection is between two and two and a half times the wall thickness t, that is, the upper width X is smaller than the lower width Y, which results from the Ausformungsprozes.
• the height of the projection H F is between the wall thickness t and ten times this wall thickness t.
• the lower radius of the recess r D is smaller than the wall thickness t.
• the wall thickness t is between 0.05 mm, 0.8 mm, preferably between 0.1 mm and 0.7 mm and, more preferably, between 0.1 mm and 0.5 mm.
• a substantially smooth outer profile is understood as meaning a profile which is caused by radii of curvature fo which are smaller than the wall thickness t.
• Fig. 11 shows a plan view of the flat tube according to the invention. This has only a single projection or web 9, and is therefore divided into two channels.
• the ratio of the tube width b to the tube height H is between 10 and 30, preferably between 10 and 24.
• the chamber or the channel size is between one third of the pipe width and half the pipe width.
• the height of the projection hp is preferably between three times the wall thickness and eight times the wall thickness.
• the lower radius of curvature rd is such that it is less than 0.75 times, preferably less than or equal to 0.5 times the wall thickness t.
• the wall thickness is between 0.05 mm and 0.6 mm, preferably between 0.1 mm and 0.4 mm and, more preferably, between 0.15 mm and 0.3 mm. This leaves a recess 11 on the outside of the flat tube, which has an area of less than 0.01 mm 2 , preferably less than 0.006 mm 2 . This represents a significant improvement over the prior art.
• the recess 11 shown in FIG. 10 has an area of less than 0.1 mm 2 , preferably less than 0.07 mm 2 , which also represents a considerable improvement over the prior art.
• the flat tube as stated at the outset, can be soldered much more easily to the tube bottom and a leak-free connection can be achieved with considerably less effort.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Geometry (AREA)
• Shaping Metal By Deep-Drawing, Or The Like (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

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Cited By (2)

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Citations (5)

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• 2004
  • 2004-10-12 DE DE102004049809A patent/DE102004049809A1/de not_active Withdrawn
• 2005
  • 2005-10-11 JP JP2007535115A patent/JP2008516177A/ja active Pending
  • 2005-10-11 WO PCT/EP2005/010904 patent/WO2006040118A1/de active Application Filing
  • 2005-10-11 EP EP05800345.0A patent/EP1805469B1/de active Active
  • 2005-10-11 TR TR2019/10994T patent/TR201910994T4/tr unknown
  • 2005-10-11 US US11/664,993 patent/US20070295490A1/en not_active Abandoned

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