EP1253391A1 - Tube plat plié à cavités multiples - Google Patents

Tube plat plié à cavités multiples Download PDF

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Publication number
EP1253391A1
EP1253391A1 EP02006243A EP02006243A EP1253391A1 EP 1253391 A1 EP1253391 A1 EP 1253391A1 EP 02006243 A EP02006243 A EP 02006243A EP 02006243 A EP02006243 A EP 02006243A EP 1253391 A1 EP1253391 A1 EP 1253391A1
Authority
EP
European Patent Office
Prior art keywords
flat tube
web
chamber
chamber flat
openings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02006243A
Other languages
German (de)
English (en)
Other versions
EP1253391B1 (fr
Inventor
Jürgen Dipl.-Ing. Hägele
Volker Dipl.-Ing. Kurz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Publication of EP1253391A1 publication Critical patent/EP1253391A1/fr
Application granted granted Critical
Publication of EP1253391B1 publication Critical patent/EP1253391B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • Y10T29/49391—Tube making or reforming

Definitions

  • the invention relates to a one-piece multi-chamber flat tube folded webs, in particular according to the preamble of the claims 1, 2, 18 or 19, a method for producing such a multi-chamber flat tube and a heat exchanger with at least one such multi-chamber flat tube.
  • Such flat tubes became known through the European patent Applicant's EP 0 302 232 B1.
  • Such a pipe becomes one Made of metal strips, the webs forming the individual Chambers are made by folding the metal strip. These bridges are therefore double-walled and form a bridge at their bending point which is soldered to the inside of the flat tube.
  • the longitudinal seam of a such a flat tube can also be produced by soldering.
  • the Metal strip is preferably solder-plated on both sides, so that both on the Soldering on the inside as well as on the outside of the flat tubes is possible.
  • the aforementioned flat tubes are used both as coolant tubes for coolant heat exchangers as well as refrigerant pipes for condensers in Automotive air conditioning use. Especially with refrigerant condensers high heat transfer performance is desirable, which is why the hydraulic diameter of the individual chambers very much small in size, d. H. in the range of one to two millimeters. Yet these pipes still have potential for increasing the heat transfer capacity on.
  • the webs have openings, d. H. Passages, which is a cross connection and thus a cross flow of Refrigerant or the heat transfer medium from one to the other Allow flow channel. This improves heat transfer.
  • Such breakthroughs are per se for unfolded multi-chamber tubes known, e.g. B. by DE-A 100 14 099 - but it is this multi-chamber pipe by an at least two-part construction, d. H. the pipe is assembled from at least two pipe elements, wherein the one tubular element is a base plate with non-folded webs (so-called reinforcement walls) into which the openings are made be, and the other tubular element is a flat cover plate, the then with the first pipe element to a closed pipe cross section is connected.
  • reinforcement walls non-folded webs
  • the other tubular element is a flat cover plate
  • the advantage of the invention is that on the one hand the heat transfer can be increased on the inside of such multi-chamber tubes and that this with folded flat tubes made from a sheet metal strip is possible. Because the base material is solder-plated on both sides is ensured that the fold, i.e. H. double-walled Bridges in the area of their contact surfaces and immediately outside the openings solder together so that the tightness of the tube is guaranteed is.
  • the solution is The task is that the web ridges are each two folded webs stand opposite and are soldered together. This enables in one advantageous development, the introduction of two breakthroughs each face each other and after soldering a through opening form.
  • the webs advantageously form a right angle to a pipe wall, because the web height simply depends on the distance between two pipe walls is customizable. However, it is expressly pointed out that within the scope of the invention any angle between a web and a pipe wall is conceivable.
  • the Breakthroughs are formed as notches that emanate from the ridge - as a result, the solder seam between the bridge back and the inner wall of the Flat tube or interrupted between two ridges, on the other hand this type of breakthrough brings manufacturing advantages, in particular with regard to the tightness of the pipe.
  • the openings are slit-shaped. This enables one Open the opening as desired by bending one onto the slot adjacent edge of the web.
  • the idea is a slit-like breakthrough, at least in part given that a section of the web back is not with a pipe wall or an opposite back of another bridge is soldered.
  • the solution is Task in that a multi-chamber flat tube has at least one web, which is wave-shaped at least in the region of the web back is.
  • the flow of the flowing through the flat tube Medium affects that heat transfer is improved.
  • two webs are in each case together soldered, at least one of the webs at least in the area of the bridge back is wave-shaped.
  • through openings occur between two soldered bars, through which the medium flowing through the flat tube can pass.
  • the two ridges can also be opened full length to be soldered together, so that there is no passage between the corresponding flow channels opens.
  • This inventive method allows both continuous production of the folded multi-chamber pipe So-called rotary punching as well as punching the breakthroughs in the cycle method.
  • the breakthroughs are in according to a predetermined pattern arranged the sheet metal strip that they immediately after the folding process lying on top of each other, d. H. cursed with each other. With the subsequent soldering of the inner contact surfaces, these breakthroughs become the outside sealed.
  • these notches according to the folds can be formed into the ridges by rolling.
  • the depth the notches correspond approximately to the thickness of the metal strip, and the outer skin the bridge back can thus remain closed, so that there is an improvement the tightness of the pipe.
  • an endless, flat sheet metal webs folded, their web backs to a wave shape be bent. Then the sheet is closed Multi-chamber flat tube shaped, after which the web backs to the inner wall of the flat tube or, if necessary, to a further web back and finally the longitudinal seam are soldered.
  • Fig. 1 shows a folded multi-chamber pipe in a schematic and perspective view.
  • the multi-chamber tube 1 is made from a folded sheet metal strip 2 and has three webs 3, 4 and 5, which are designed as folds, ie are produced by folding the sheet metal strip 2.
  • the fourth web 6 is formed by the longitudinal edge regions of the sheet metal strip 2. Through these webs 3, 4, 5 and 6, five chambers 7, 8, 9, 10 and 11 are formed, through which a heat transfer medium, for. B. refrigerant flows.
  • Circular openings 12 are arranged in the webs 3, 4, 5, which allow a cross flow of the heat exchange medium from one into the adjacent channel.
  • FIG. 1a shows a cross section through the multi-chamber tube according to FIG. 1.
  • the same reference numbers are used for the same parts.
  • the web 3 is formed by two adjacent legs 13 and 14, which are connected to one another via a web back 15 and have a common contact surface 16.
  • the web 3 or the chambers 7 and 8 have a height h.
  • the opening 12 is arranged approximately halfway up, ie in the middle of the web height, ie it is formed by an opening 12 'in the leg 13 and an opening 12 "in the leg 14, both openings 12' and 12" being aligned with one another ,
  • the two legs 13 and 14 are soldered to one another, so that the opening 12 and thus the chambers 7 and 8 are sealed off from the outside.
  • the bridge back is soldered to the inner wall 17, which is indicated by the solder menisci 18 and 19.
  • the other webs 4 and 5 are formed analogously.
  • the web 6 forms the longitudinal seam 20 of the multi-chamber tube 1 and is formed by the adjacent, soldered together edge regions 21 and 22 of the sheet metal strip 2. Although not shown in the drawing, openings can also be arranged in the web 6 in an analogous manner.
  • FIG. 1b shows another example of a multi-chamber flat tube 100 according to the invention.
  • the web backs 110 and 120 of the webs 130 and 140 face each other and are soldered together.
  • the notch-shaped openings 150 in web 130 and 160 in web 140 in this example also face each other and together form a through-opening for the medium flowing through the multi-chamber pipe between chambers 170 and 180.
  • the webs 135 and 145 between chambers 180 and 190 and the webs 138 and 148 between the chambers 190 and 195 are constructed analogously.
  • FIGS. 1c and 1d show two examples of a multi-chamber tube with webs that do not take a right angle to one of the tube walls.
  • the webs 210, 220 and 230 are parallel to one another, but are inclined in relation to the tube walls 240 and 250.
  • the webs 310, 320 and 330 are in relation to the tube walls 340 and 350 alternately inclined in one of the two possible directions. Due to the oblique arrangement of the webs in FIGS. 1c and 1d , the cross-sectional shape of the channels 260, 270, 280 and 290 or 360, 370, 380 and 390 can be adapted in terms of the flow conditions to an improved heat transfer. The breakthroughs are not shown for the sake of clarity.
  • FIG. 2 shows a partial section in the longitudinal direction of the multi-chamber pipe 1 with the openings 12, which are circular and each have a distance x from the inside 30, 31 of the pipe wall 32.
  • V F 1 + F 2 + F 3 lh x 100 where 5% ⁇ V ⁇ 10%.
  • This opening ratio V should therefore preferably be five to ten percent amount to an improvement in heat transfer and a real one Cross flow of the heat transfer medium from one to the other Reach flow channel.
  • Fig. 5 shows a similar partial section as Fig. 2 and 3 with a modified cross-sectional shape: the openings 34 are elongated in this case, that is, the longitudinal extension extends in the vertical direction, the uppermost contour of the opening 34 adjacent to the inside 35 of the tube wall 36 , 5a shows a section along the section plane A - A in FIG. 5.
  • This design of the openings 34 has the advantage that the solder seam 38 is only interrupted in the longitudinal direction for relatively short distances, namely in the region of the width t of the openings 34. This increases the strength of the pipe against the internal pressure.
  • FIG. 5b shows a section of the not yet folded sheet metal strip with the punch geometry 34 'for the openings 34.
  • This punch geometry shows an elongated hole 34' with the width t and the (unwound) length I '.
  • the line in which the sheet metal strip is folded after punching is indicated by the dash-dotted line f. 5a, a U-shaped line I is drawn in as a dashed line, which corresponds to the developed length I 'in FIG. 5b.
  • FIG. 6 shows a further cross-sectional shape: the openings 40 are approximately T-shaped, this "T” being upside down: the horizontal bar of the T lies at the bottom, the vertical bar extends up to the lower edge 41 of the tube wall 42 A section along the plane BB is shown in Fig. 6a .
  • the contact surfaces 37 and 43 of the fold are tightly soldered to ensure the tightness of the tube.
  • FIG. 6b again shows a section of the not yet folded sheet metal strip with the punching geometry 40 'for the openings 40. While the openings 40 are T-shaped, the punching geometry 40' has the shape of a double T, the folding line f is shown in dash-dotted lines. The height of the double T is shown with m '- it corresponds to the U-shaped line m in Fig. 6a. Both opening forms 34 and 40 are thus produced by punching and then folding around the line f.
  • FIG. 7 and 7a show a further embodiment of openings which are designed as notches 44 with a triangular cross section. These notches start from the upper edge 45 of the web back and extend with their tip 46 to the opposite side 47. Analogously to the previous exemplary embodiments, the web back is soldered to the tube wall and in the region of the contact surface 49 with its top edge 45.
  • the notches 44 each have a width a and a depth t.
  • FIG. 8 shows a heat exchanger 50 which, in a known manner (for example through EP-A 0 219 974), has two collecting tubes 51 and 52, between which there is a network consisting of flat tubes 53 and corrugated fins 54.
  • These flat tubes 53 are designed as multi-chamber tubes of the type described above and are in fluid communication with the collectors 51, 52. They are soldered in a manner known per se in passages (not shown) of the collectors 51 and 52.
  • the corrugated fins 54 are soldered to the outside of the flat tubes 53, which is possible as a result of the solder plating on both sides of the multi-chamber tubes described above. If so, the entire heat exchanger 50, which consists only of parts of an aluminum alloy, can be soldered in one operation.
  • FIGS. 9a to 9h show a schematic representation of the process steps a) to h) for producing the multi-chamber pipes according to the invention according to the exemplary embodiments according to FIGS. 1-6.
  • a first process step a an endless smooth strip 60 is fed to a pipe forming machine (not shown), which is punched in a second method step b) (according to a predetermined pattern): according to the number and position of folds (cf. FIGS. 1 and 1a), three rows 61, 62 and 63 of circular openings 64 are punched into the smooth strip 60.
  • This punching can either be carried out continuously by so-called rotary punching or in cycles, whereby individual sections of the smooth strip are perforated.
  • the punching of the breakthroughs in time can be carried out on a separate tool station and before the smooth strip is fed to the tube forming machine - this has the advantage that the speed of the punching is independent of the feeding speed of the smooth strip for the tube forming machine.
  • the perforated smooth strip can be fed directly from the coil to the tube forming machine.
  • the result of the process step "punching" is shown by the perforated tape 60.1 in b) and c).
  • a first bead 65 is formed in the band 60.1 in the area of the row of holes 62, and in the subsequent process step e) two further beads 66 and 67 are formed in the band 60.2 in the area of the row of holes 61, so that the band form 60.3 is created.
  • a further forming step f the beads 65, 66 and 67 are formed into folds 68, 69 and 70 and the edges of the band 60.3 are set up to form webs 71 and 72.
  • the folds 68, 69 and 70 are produced, it is ensured that opening 64 lies on opening and thus a passage opening is formed.
  • the folded band 60.4 is angled with a radius 73 and 74, so that the pipe depth is already fixed.
  • the projecting legs 75 and 76 are then further bent to a parallel position, so that the finished multi-chamber tube 60.6 results. This is soldered in a further process step, not shown, ie preferably together with the corrugated fins and the remaining parts of the entire heat exchanger.
  • 10a to 10h show the representation of a further production process with process steps a) - g).
  • process step a) an endless smooth strip 80 is fed in, in process step b) a first bead 81 is formed, in process step c) two further beads 82 and 83 are formed, and in process step d) folds 84, 85, 86 and erected edge areas are formed 87 and 88 shaped.
  • the reference numbers 80, 80.1, 80.2 and 80.3 denote the endless belt in each case after the individual process steps have been carried out.
  • transverse beads or notches 89 are embossed into the web ridges 84 ', 85' and 86 'of the individual folds 84, 85 and 86, ie by non-cutting shaping.
  • This can take place, for example, by means of a rolling movement running transversely to the belt direction, or also by means of an embossing roller, the peripheral speed of which runs in the same direction as the feed of the belt.
  • the representation of method step e) is shown in FIGS. 10e and 10f, ie as a view in the direction X - X and as a cross section through the band 80.4 (FIG. 10f).
  • FIG. 11 shows the cross section of a further example of the configuration of an opening 405 in a web 410 of a multi-chamber flat tube 400 according to the invention.
  • the web 410 is bent laterally over part of its length, so that an opening is formed between the bent part and the opposite tube wall 420 405 between the chambers 430 and 440 remains free.
  • FIG. 11a A longitudinal section of the opening 405 from FIG. 11 can be seen in FIG. 11a . It is clear here that before a part of the web 450 is bent, a slot must be made in the web, which in this case consists of three individual slots 460, 470 and 480, the slot 480 being realized in that the web back 490 is on the Length z is not soldered to the opposite tube wall 420.
  • FIG. 11b The arrangement of slots in a sheet metal strip 500 required for a breakthrough according to FIG. 11 or FIG. 11a before the webs are folded is shown in FIG. 11b .
  • Slits 510 and 520 or 530 and 540 are cut into the sheet metal strip 500 symmetrically to a fold edge 550, the later web back.
  • a U-shaped slot is then created together with a part of the web back.
  • the part of the web between the slots 510 and 520 or 530 and 540 can finally be bent over, whereby a breakthrough as in FIGS. 11 and 11a is obtained.
  • FIG. 12 shows a further possibility of designing openings in the form of bent slots in a multi-chamber flat tube 600 according to the invention.
  • the sheet metal strip is provided with double-T-shaped slots before the webs are folded, which slots look T-shaped and each after folding define two free-standing areas 630 and 640 of the web 610, which in turn are bent out of the plane of the web 610.
  • the slot widens into an opening 650 between the chambers 660 and 670.
  • the web 610 can be seen in a longitudinal section of the multi-chamber flat tube 600.
  • the opening 650 between the bent regions 630 and 640 of the web is particularly clear here.
  • FIG. 13 shows a cross section of the multi-chamber flat tube 700 according to FIG. 12 or FIG. 12a .
  • a bent region 710 of the web 720 between the chambers 730 and 740 can be seen here again, which in this example extends over part of the height of the web 720.
  • the web 750 is bent over its entire height, so that there is a larger opening between the adjacent chambers 760 and 770.
  • a web 810 is bent on the side of a tube wall 820, but an adjacent web 830 is bent on the side of a tube wall 840 opposite the tube wall 820. This influences the flow of a medium through the chambers 850, 860 and 870 in that heat transfer from the medium to another flowing medium is further promoted.
  • FIG. 14 shows an arrangement of double-T-shaped slots 910, 920, 930, 940, 950 and 960 in a sheet metal strip 900, from which a multi-chamber pipe according to the invention with openings as in FIGS. 12 to 13b is later formed.
  • the slots 910, 920, 930, 940, 950 and 960 are axially symmetrical with respect to the folded edges 970 and 980, the subsequent web back, so that two T-shaped slots come to lie on top of each other after the folding.
  • the resulting free-standing web areas 911 and 912 are then bent open, after which a multi-chamber flat tube according to the invention, for example as shown in FIG. 12 , is produced.
  • the length x + 2h must be selected for the distance between two folded edges 970 and 980 on the sheet metal strip 900 in FIG. 14 , where h is the height of a web ,
  • FIG. 15 shows a further design example of a multi-chamber flat tube 1000 according to the invention.
  • the web ridges 1010, 1020, 1030 and 1040 of the webs which are not shown further here, are wave-shaped so that the flow of a medium through one of the chambers 1050, 1060 or 1070 adapts to this shape, as a result of which the heat transfer to a medium outside the multi-chamber tube 1000 is improved is.
  • FIG. 15a Another variant of a multi-chamber flat tube according to the invention is shown in FIG. 15a .
  • the waveforms of the web ridges 1110, 1120, 1130 and 1140 are displaced relative to one another in the longitudinal direction of the webs such that the flow chambers 1150, 1160 and 1170 have tapered portions 1180 and widened portions 1190.
  • the heat transfer is increased again compared to an arrangement as in FIG. 15 .

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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)
  • Air Bags (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP02006243A 2001-04-28 2002-03-20 Tube plat plié à cavités multiples Expired - Lifetime EP1253391B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10121001 2001-04-28
DE10121001 2001-04-28

Publications (2)

Publication Number Publication Date
EP1253391A1 true EP1253391A1 (fr) 2002-10-30
EP1253391B1 EP1253391B1 (fr) 2006-06-28

Family

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Application Number Title Priority Date Filing Date
EP02006243A Expired - Lifetime EP1253391B1 (fr) 2001-04-28 2002-03-20 Tube plat plié à cavités multiples

Country Status (5)

Country Link
US (1) US6622785B2 (fr)
EP (1) EP1253391B1 (fr)
AT (1) ATE331927T1 (fr)
DE (2) DE50207354D1 (fr)
ES (1) ES2266331T3 (fr)

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WO2009106573A1 (fr) * 2008-02-26 2009-09-03 Guenther Eberhard Système pour la dissipation de pertes thermiques
CN111527368A (zh) * 2018-01-19 2020-08-11 株式会社电装 热交换器

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US10801781B2 (en) * 2018-10-17 2020-10-13 Hanon Systems Compliant b-tube for radiator applications
DE102019211969A1 (de) * 2019-08-09 2021-02-11 Mahle International Gmbh Flachrohr und Kondensator mit Flachrohr
JP7247251B2 (ja) 2021-03-30 2023-03-28 本田技研工業株式会社 熱交換器

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EP1939571A2 (fr) * 2006-12-28 2008-07-02 LG Electronics Inc. Élément d'échange thermique pour appareil de ventilation
EP1939571A3 (fr) * 2006-12-28 2011-07-06 LG Electronics Inc. Élément d'échange thermique pour appareil de ventilation
WO2009106573A1 (fr) * 2008-02-26 2009-09-03 Guenther Eberhard Système pour la dissipation de pertes thermiques
CN111527368A (zh) * 2018-01-19 2020-08-11 株式会社电装 热交换器
CN111527368B (zh) * 2018-01-19 2022-05-13 株式会社电装 热交换器

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DE50207354D1 (de) 2006-08-10
EP1253391B1 (fr) 2006-06-28
US6622785B2 (en) 2003-09-23
US20020174979A1 (en) 2002-11-28
ATE331927T1 (de) 2006-07-15
DE10212300A1 (de) 2002-11-14
ES2266331T3 (es) 2007-03-01

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