EP1805469B1 - Flachrohr für wärmetauscher - Google Patents

Flachrohr für wärmetauscher Download PDF

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Publication number
EP1805469B1
EP1805469B1 EP05800345.0A EP05800345A EP1805469B1 EP 1805469 B1 EP1805469 B1 EP 1805469B1 EP 05800345 A EP05800345 A EP 05800345A EP 1805469 B1 EP1805469 B1 EP 1805469B1
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EP
European Patent Office
Prior art keywords
flat tube
foregoing
projecting part
longitudinal wall
projection
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
EP05800345.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1805469A1 (de
Inventor
Jürgen Hägele
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle Behr GmbH and Co KG
Original Assignee
Mahle Behr GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mahle Behr GmbH and Co KG filed Critical Mahle Behr GmbH and Co KG
Publication of EP1805469A1 publication Critical patent/EP1805469A1/de
Application granted granted Critical
Publication of EP1805469B1 publication Critical patent/EP1805469B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • 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 in motor vehicle air conditioners, in the prior art, in addition to collecting devices for a refrigerant flat tubes, which are provided for forwarding the refrigerant or other fluids.
  • the EP 0 854 343 shows such flat tubes, which have on their outer side considerable external cavities, which are reduced by a complex process.
  • EP 1 106 949 and EP 0 829 316 disclose multi-channel flat tubes with protrusions.
  • the present invention is therefore an object of the invention to provide a flat tube, which has projections in its interior and at the same time largely avoids recesses or recesses on its outer side in the region of the projections.
  • 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 of the material of the longitudinal wall projection is understood such a projection that 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. Under essentially flat is understood that the outer profile in the region of the projections has 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 on.
  • at least one end portion is bent through substantially 180 degrees to cause the two Longitudinal walls are arranged substantially parallel with respect to each other.
  • the second end portion can also be bent to close the flat tube in another way, for example, in the course of the manufacturing process, the respective end portions of the base material can be partially bent by a predetermined angle, and then 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 the 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 mutually substantially separated chambers.
  • the distances between the projections can be selected 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 of, more preferably all projections, a substantially symmetrical profile. This means that the projection has an axis of symmetry substantially perpendicular to the plane of the longitudinal wall has, 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 projections are preferably adapted, wherein in particular also procedural framework conditions are to be considered.
  • 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.
  • the third and fourth shaping unit are corresponding roles, between which the material to be processed is arranged.
  • the rollers are designed so that a role is limited by lateral conclusions of the other role, to prevent in this way 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 method step preferably consists in reducing its height and / or width. Preferably, both the height and the width of the projection during this process step is reduced. 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.
  • 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.
  • a pre-centering of the projection is carried out in a further method step. This is preferred over a preference.
  • the rotatable rollers, through which the material is passed have a substantially constant distance from one another.
  • 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 strip is understood to mean the expansion in the direction of the roller axis.
  • the width of the material strip remains constant in at least one method step. In these process steps, a change in shape of the projection is achieved substantially without the use of further material from the vicinity of the projection.
  • a plurality of projections are formed from the strip of material.
  • the required amount of additional material can preferably be obtained by reducing the length of the strip in a first method step.
  • the projections are preferably formed at predetermined distances from each other.
  • 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 protrusions are subjected to different shaping steps.
  • 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 the individual process steps of a method according to the invention for producing a projection are shown.
  • 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 illustrated method represents only one 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 character L denotes the center line, preferably the axis of symmetry of the protrusion 9a to 9f produced.
  • pre-centering of the projection 9a is performed by a preference. This is particularly advantageous if the projections or webs with high heights H A to H F 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 height H B generated in method step 2 represents the maximum height H max of the projection 9 b , 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 always substantially the same amount of material is supplied to the shaping units or the rollers. This is achieved by a corresponding 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 decreases, 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 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 during the method steps 2 to 6 preferably remains substantially constant.
  • 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 be closed by folding, gathering or squeezing.
  • the height H D or H E is substantially reduced, but the total strip 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.
  • the strip width b to f does not remain constant, at least partially. If this procedure is followed, when compressing the projection, material or strip material can flow back into the band width, that is, out of the region of the projection.
  • One possible consequence is that too little material is available for closing the outer cavity 11 in further method steps, or more material has to be brought forward in the first stages. In this case, even stronger thinning of the material strip 7 and a higher risk of cracking occur.
  • the required ridge height may not be achieved and the process will be more sensitive to variations in strip material properties.
  • a final height H F is achieved, which is less than the height H E in step 5.
  • the area 11, which is still present in step 5 substantially closed and therefore the smooth outer profile according to the invention reached.
  • the bandwidth or total width of the strip e is also not further reduced, that is, the bandwidth f and the bandwidth e are substantially the same.
  • Fig. 2a shows the shaping units for carrying out the method according to the invention, which is an upper roller 21 and a lower roller 22. Between these rollers, the flat tube material 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.
  • the recess 26 and the machining projection 25 are adapted to each other so that between them the material with a predetermined thickness or thickness S can be passed.
  • Fig. 2a shows the pair of rollers 21, 22 in the processing step 2 from Fig. 1 that is, 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 pair of rollers for the process step 4.
  • the recess 26 is designed such that the projection reaches the illustrated height H D.
  • the lower roller 22 has here no more machining projection.
  • the gaps 13a and 13b between the upper roller 21 and the lower roller 22 are now in width with respect to in Fig. 2a reduced device shown.
  • the lower roller 22 is, for example, according to the strip width b of processing step 4 from Fig. 1 designed.
  • Fig. 2c is the device for the in Fig. 1 shown method step 6 shown.
  • the lower roller 22 also has no 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 chosen to be minimal, that is, 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 event that multiple projections - more precisely, an even number of projections - to be generated.
  • the individual method steps have been identified here by the reference symbols I to VIII.
  • a trough 31 generated.
  • the generation of this trough is particularly advantageous if the projections to be produced are to have a comparatively large initial height H B.
  • 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 strip width a to method step II to a strip width b and in method step III to a strip 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 the 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 because it allows material from the respective outer regions of the material strip to be used to produce the new protrusions and prevents material from being drawn in from the regions of other already produced protrusions.
  • it is also possible to provide or produce several projections instead of the projection shown here.
  • the in Fig. 3 shown process steps only as an example. 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.
  • a flat tube is shown, which by the in Fig. 3 sketched method can be produced.
  • the flat tube 1 results in cross section through a deformation of the in Fig. 3 strip shown under 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 end portions are soldered to the respective opposite longitudinal wall.
  • the two bent end portions 18 and 19 are sealed together.
  • FIG. 5 For example, the process steps I to VIII are shown to produce a flat tube having an odd number of protrusions, more specifically, three protrusions in this case.
  • 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.
  • process step II is - similarly as in process step II at Fig. 3 - Produces a projection 9a.
  • This projection is transformed into method step III, wherein in this method step the strip width a is first reduced to the width b, and this again to the width c, 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, 9b and 9c are staggered, that is, while in the case of the projection 9a, the first deformation has already taken place, the portions 9b and 9c have been produced first.
  • 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.
  • step V 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 forming 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 lower.
  • a further method 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.
  • Fig. 6 a flat tube is shown, which consists of the in Fig. 5 shown lowest strip results. Unlike the in Fig. 4 shown embodiment, the end portions are not arranged in the region of the curvatures 17 or 18, but in the central region. That's exactly what it's about the respective bent-up folds 42a and 42b. These are welded or soldered together and thus provide another advantage.
  • the individual projections 9a to 9c and 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 This in Fig. 5 illustrated method (step I-VIII) can be used in general for flat tubes with an odd number of protrusions, while the in Fig. 3 shown method is preferably used for flat tubes with an even number of projections use.
  • the formation of the Endfalze 42a, 42b according to Fig. 6 or the Endfalze 18, 19 according to Fig. 4 is, however, largely possible regardless of the number of projections in particular in a known manner.
  • Fig. 7 a flat tube according to the invention is shown, wherein the individual dimensions serve to illustrate.
  • the illustration of the smooth or even outer surface of the flat tube according to the invention that is, the representation of the minimized surface 11 under the projection 9, has been dispensed with. Also, the flanks of the projection were not shown compressed.
  • the reference a refers to the distance of the webs along a longitudinal wall.
  • the reference character K denotes the distance between two adjacent webs, which may 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 pitch is in this embodiment at least twice as large as the width T. Therefore, the minimum chamber size or channel size is at least as large or larger than the thickness T.
  • projections 9 are attached only to the longitudinal wall 14, which contact the longitudinal wall 15.
  • the land distance a substantially coincides with the chamber or channel size K.
  • 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 projections 9 do not contact the respective opposite longitudinal wall 14 or 15, but on the opposite longitudinal wall in turn attached projections 9. This means that contact the ends of the projections approximately in the middle 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.
  • Fig. 10 shows an enlarged view of a projection 9 according to the invention, in which the dimensions are shown in detail.
  • To the in Fig. 10 To reach the final shape shown are provided between four and ten steps in which each of the projections are formed. The number of process steps to be used depends on the height H F to be achieved , the wall thickness or strip thickness t and the material properties. If a plurality of projections, or webs to be generated, but far more process steps may be necessary.
  • R is the upper radius of curvature
  • X is the width of the projection at its tip
  • Y is the width of the projection 9 at its base
  • R F is the radius of curvature at the base of the projection
  • R D is the radius of curvature of the recess 11.
  • the upper radius of curvature r F is in the invention between 0 and the wall thickness t, that is smaller than the wall thickness t.
  • the lower radius of curvature R F 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 twice 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 molding process.
  • 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. This means that a substantially smooth outer profile is understood as meaning a profile which is caused by radii of curvature r D 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 H F 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.
  • recess 11 has an area of less than 0.1 mm 2 , preferably less than 0.07 mm 2 , which also represents a significant improvement over the prior art.
  • the flat tube as stated at the outset, can be soldered much more easily to the tubesheet and a dense 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)
EP05800345.0A 2004-10-12 2005-10-11 Flachrohr für wärmetauscher Active EP1805469B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004049809A DE102004049809A1 (de) 2004-10-12 2004-10-12 Flachrohr für Wärmetauscher
PCT/EP2005/010904 WO2006040118A1 (de) 2004-10-12 2005-10-11 Flachrohr für wärmetauscher

Publications (2)

Publication Number Publication Date
EP1805469A1 EP1805469A1 (de) 2007-07-11
EP1805469B1 true EP1805469B1 (de) 2019-05-29

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US (1) US20070295490A1 (ja)
EP (1) EP1805469B1 (ja)
JP (1) JP2008516177A (ja)
DE (1) DE102004049809A1 (ja)
TR (1) TR201910994T4 (ja)
WO (1) WO2006040118A1 (ja)

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FR2923591B1 (fr) * 2007-11-09 2017-07-21 Valeo Systemes Thermiques Branche Thermique Moteur Tubes multicanaux pour un echangeur de chaleur brase
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JP2011099630A (ja) * 2009-11-06 2011-05-19 Mitsubishi Electric Corp 熱交換器及びこの熱交換器を用いた冷蔵庫、空気調和機
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FR2973490B1 (fr) * 2011-03-31 2018-05-18 Valeo Systemes Thermiques Tube pour echangeur thermique, echangeur thermique et procede d'obtention correspondants

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Publication number Publication date
TR201910994T4 (tr) 2019-08-21
US20070295490A1 (en) 2007-12-27
JP2008516177A (ja) 2008-05-15
EP1805469A1 (de) 2007-07-11
WO2006040118A1 (de) 2006-04-20
DE102004049809A1 (de) 2006-04-13

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