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EP1253391B1 - Tube plat plié à cavités multiples - Google Patents

Tube plat plié à cavités multiples Download PDF

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Publication number
EP1253391B1
EP1253391B1 EP02006243A EP02006243A EP1253391B1 EP 1253391 B1 EP1253391 B1 EP 1253391B1 EP 02006243 A EP02006243 A EP 02006243A EP 02006243 A EP02006243 A EP 02006243A EP 1253391 B1 EP1253391 B1 EP 1253391B1
Authority
EP
European Patent Office
Prior art keywords
web
flat tube
chamber
webs
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.)
Expired - Lifetime
Application number
EP02006243A
Other languages
German (de)
English (en)
Other versions
EP1253391A1 (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 with folded webs, 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 have been known by the Applicant's European patent EP 0 302 232 B1.
  • Such a tube is made of a metal strip, wherein the webs are made to form the individual chambers by folding the metal strip. These webs are thus double-walled and form at their bending point a web back, which is soldered to the inside of the flat tube.
  • the longitudinal seam of such a flat tube can also be produced by soldering.
  • the metal strip is preferably solder-plated on both sides, so that soldering is possible both on the inside and on the outside of the flat tubes.
  • JP 11294990 describes multi-chamber flat tubes with folded webs whose web backs are soldered either with each other or with inner walls of the flat tubes.
  • JP 06129734 proposes to provide connecting holes in the webs between the individual chambers in a multi-chamber flat tube. This is to improve the heat transfer and the pressure loss can be reduced.
  • the aforementioned flat tubes are used both as coolant tubes for coolant heat exchangers and as refrigerant tubes for condensers in motor vehicle air conditioners.
  • a high heat transfer capacity is desired, which is why the hydraulic diameter of the individual chambers is dimensioned very small, i. H. in the range of one to two millimeters. Nevertheless, these tubes still have potential for increasing the heat transfer performance.
  • the webs have openings, that is, passage openings, the cross-connection and thus a cross-flow of the refrigerant or the heat transfer medium from one to the other Allow flow channel.
  • the openings are formed as notches, which emanate from the web back - this breaks the Lötnaht between web back and inner wall of the flat tube or between two web backs, on the other hand brings this type of breakthroughs in the production, in particular with regard to the tightness of the pipe.
  • US Pat. No. 5,323,851 has also disclosed extruded multi-core tubes with openings in the web walls, but the production of such tubes is relatively difficult and therefore associated with high costs.
  • the advantage of the invention is therefore that on the one hand, the heat transfer can be increased on the inside of such multi-chamber tubes and that this is possible with folded, made of a metal strip flat tubes. Characterized in that the starting material solderplattiert both sides is, it is ensured that as a rebate, ie double-walled webs in the region of their contact surfaces and immediately outside the apertures solder together, so that the tightness of the tube is guaranteed.
  • the solution of the problem is that the web backs are each facing two folded webs and are soldered together. This allows in an advantageous development, the introduction of two openings, which face each other and form a through hole after soldering.
  • the webs form a right angle to a pipe wall, since so the web height is easily adaptable to the distance between two pipe walls. It is expressly understood, however, that any angle between a web and a pipe wall is conceivable within the scope of the invention.
  • a manufacturing method is proposed by which the notches are introduced by punching in the sheet metal strip before folding the webs.
  • This inventive method allows both a continuous production of the folded multi-chamber tube by so-called.
  • Rotary punching as well as a punching of the apertures in the cycle method.
  • the breakthroughs are arranged in a predetermined pattern in the sheet metal strip that they lie directly after the folding process, d. H. aligned with each other. During subsequent soldering of the inner contact surfaces, these openings are sealed to the outside.
  • a method for producing the notches is advantageous, wherein these notches are formed after folding by rolling into the web backs.
  • the depth of the notches corresponds approximately to the thickness of the metal strip, and the outer skin of the web back can thus remain closed, so that there is an improvement in the tightness of the tube.
  • Fig. 1 shows a folded multi-chamber tube in a schematic and perspective view.
  • the multi-chamber tube 1 is made of a folded sheet metal strip 2 and has three webs 3, 4 and 5, which are formed as folds, that are made 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. As refrigerant flows.
  • the webs 3, 4, 5 circular openings 12 are arranged, 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 of FIG. 1.
  • the web 3 is formed by two abutting legs 13 and 14, which communicate with each other via a web spine 15 and have a common contact surface 16.
  • the web 3 and the chambers 7 and 8 have a height h.
  • both openings 12' and 12" are aligned with each other .
  • the web back is soldered to the inner wall 17, which is indicated by the Lötmenisken 18 and 19.
  • the further 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, mutually soldered edge regions 21 and 22 of the sheet-metal strip 2.
  • FIG. 1 b shows a further exemplary embodiment of a multi-chamber flat tube 100 according to the invention.
  • the web spines 110 and 120 of the webs 130 and 140 face each other and are soldered together.
  • the notches in this example 150 in ridge 130 and 160 in web 140 are also opposite and together form a passage opening for the flowing through the multi-chamber tube medium between the chambers 170 and 180.
  • the webs 135 and 145 between the chambers 180 and 190th and the webs 138 and 148 between the chambers 190 and 195 are constructed analogously.
  • Fig. 1c and Fig. 1d show two examples of a multi-chamber pipe with webs that do not take a right angle to one of the pipe walls.
  • the webs 210, 220 and 230 are parallel to each other, but are inclined with respect to the tube walls 240 and 250.
  • the webs 310, 320 and 330 with respect to the tube walls 340 and 350 alternately in one of the two possible directions inclined. Due to the oblique arrangement of the webs in Fig. 1c and Fig. 1d , the cross-sectional shape of the channels 260, 270, 280 and 290 and 360, 370, 380 and 390 are adapted to the flow conditions of 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 tube 1 with the openings 12 which are circular and each have a distance x to the inside 30, 31 of the tube wall 32.
  • the web height h 1.0 mm
  • This opening ratio V should therefore preferably be five to ten percent to improve the heat transfer and a genuine Cross flow of the heat transfer medium to reach from one to the other flow channel.
  • FIG. 5 shows a similar partial section as in FIGS. 2 and 3 with a changed cross-sectional shape: the apertures 34 are elongate in this case, ie the longitudinal extent extends in the vertical direction, with the uppermost contour of the aperture 34 being adjacent to the inner side 35 of the tube wall 36 ,
  • the adjacent figure Fig. 5a shows a section along the section plane A - A in Figure 5.
  • This design of the apertures 34 has the advantage that the solder seam 38 is interrupted in the longitudinal direction only 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 detail of the sheet metal strip, which has not yet been folded, with the punch geometry 34 'for the apertures 34.
  • This stamped geometry shows a slot 34' with the width t and the (unwound) length I '.
  • the line in which the metal strip is folded after punching is indicated by the dot-dash line f.
  • Fig. 5a is a dashed line center line a U-shaped line I located, which corresponds to the unwound length I 'in Fig. 5b.
  • Fig. 6 shows a further cross-sectional shape: the openings 40 are approximately T-shaped, with this "T" is upside down: the horizontal bar of the T is below, the vertical extends up to the lower edge 41 of the tube wall 42nd A section along the plane B-B is shown in Fig. 6a .
  • the contact surfaces 37 and 43 of the fold are soldered tight to ensure the tightness of the tube.
  • FIG. 6b again shows a section of the not yet folded metal strip with the punch geometry 40 'for the openings 40.
  • the punching geometry 40 ' has the shape of a double-T, wherein the fold line f is shown in phantom.
  • the height of the double-T is indicated by m '- it corresponds to the U-shaped line m in Fig. 6a.
  • Both breakthrough forms 34 and 40 are thus produced by a punching and subsequent folding around the line f.
  • Fig. 7 and Fig. 7a show another embodiment of apertures formed as notches 44 of triangular cross-section. These notches extend from the upper edge 45 of the web back and extend with its tip 46 to the opposite side 47.
  • the web back is similar to the previous embodiments with its upper edge 45 with the tube wall and soldered in the region of the contact surface 49.
  • the notches 44 each have a width a and a depth t.
  • FIG. 8 shows a heat exchanger 50 which, in a known manner (eg, by EP-A 0 219 974), has two collecting pipes 51 and 52, between which there is a network consisting of flat pipes 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 conventional manner in unillustrated passages of the collector 51 and 52.
  • the corrugated fins 54 are soldered on the outside of the flat tubes 53, which is possible as a result of the double-sided solder plating of the multi-chamber tubes described above. In this case, 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 method steps a) to h) for producing the multichamber tubes according to the invention according to the embodiments of FIGS. 1-6.
  • a tube forming machine not shown is an endless one Smooth belt 60 is supplied, which is perforated in a second process step b) (according to a predetermined pattern): according to the number and location of folds (see Fig. 1 and 1a) are three rows 61, 62 and 63 of circular openings 64 in the Smooth belt 60 punched.
  • This punching can be done either continuously by so-called rotary punching or intermittently, each individual sections of the smooth belt are perforated.
  • the punching of the apertures in time can be done on a separate tool station and before the supply of the smooth belt to the tube forming machine - this has the advantage that the speed of punching is independent of the feeding speed of the smooth belt for the tube forming machine.
  • the perforated smooth belt of the tube forming machine can be supplied directly from the coil.
  • the result of the method step "stamping" is represented by the perforated band 60.1 in b) and c).
  • a first bead 65 is formed in the area of the row of holes 62 in the band 60.1, and in the following process step e) two further beads 66 and 67 in the row of holes 61 and 63 formed in the band 60.2, 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 webs 71 and 72.
  • the folded band 60.4 is angled off, each with a radius 73 and 74, so that the tube depth is already fixed.
  • a further bending of the protruding legs 75 and 76 then takes place to a parallel position, so that the finished multi-chamber tube 60.6 results. This is soldered in a further process step, not shown, that is preferably together with the corrugated fins and the remaining parts of the entire heat exchanger.
  • step a) an endless smooth belt 80 is fed, in step b) a first bead 81 is formed, in step c) two further beads 82 and 83 are formed, and in step d) folds 84, 85, 86 and erected edge portions 87 and 88 shaped.
  • the reference numerals 80, 80.1, 80.2 and 80.3 denote the endless belt after each implementation of the individual process steps.
  • transversely extending beads or notches 89 are embossed into the web backs 84 ', 85' and 86 'of the individual folds 84, 85 and 86, ie by non-cutting forming.
  • 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).
  • the further method steps f) and g) are analogous to method steps g) and h) of the embodiment according to FIG. 9.
  • the soldering not shown, takes place in one operation with the entire heat exchanger.
  • FIG. 11 shows the cross section of another example of the design of an aperture 405 in a web 410 of a multi-chamber flat tube 400 according to the invention.
  • the web 410 is laterally bent over part of its length so that an opening exists between the folded part and the opposite pipe wall 420 405 remains free between the chambers 430 and 440.
  • Fig. 11a is a longitudinal section of the aperture 405 of Fig. 11 can be seen.
  • a Slot must be introduced into the web, which consists in this case of three individual slots 460, 470 and 480, wherein the slot 480 is realized in that the web back 490 is not soldered to the length z with 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 .
  • Slots 510 and 520 or 530 and 540 are cut into the sheet-metal strip 500 symmetrically with respect to a folded edge 550, the later web back.
  • By folding the web is then formed together with each part of the web back respectively a U-shaped slot.
  • the portion of the ridge between the slots 510 and 520 or 530 and 540 can eventually be bent, thereby obtaining a breakthrough as shown in Fig. 11 and Fig. 11a .
  • Fig. 12 shows a further possibility of the design of apertures in the form of bent slots in a Mehrschlachrohr 600 according to the invention.
  • the sheet metal strip is provided before folding the webs with double-T-shaped slots, which look like a T-shape after folding and respectively define two free-standing portions 630 and 640 of the web 610, which in turn are bent out of the plane of the web 610.
  • the slot is widened to an opening 650 between the chambers 660 and 670.
  • Fig. 12a the web 610 can be seen in a longitudinal section of the multi-chamber flat tube 600.
  • the opening 650 between the bent-up portions 630 and 640 of the web becomes particularly clear.
  • FIG. 13 shows a cross section of the multi-chamber flat tube 700 according to FIG. 12 or FIG. 12 a .
  • the web 750 is bent over its entire height, so that a larger opening between the adjacent chambers 760 and 770 results.
  • a web 810 is bent on the side of a pipe wall 820, but an adjacent web 830 on the side of a pipe wall 840 opposite the pipe wall 820. This influences the flow of a medium through the chambers 850, 860 and 870, respectively in that the 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 tube according to the invention with openings as in FIGS. 12 to 13b is formed later.
  • the slots 910, 920, 930, 940, 950 and 960 are axially symmetrical with respect to the folding edges 970 and 980, the later web backs, shaped so that after folding each two T-shaped slots come to rest on each other.
  • the resulting free-standing web portions 911 and 912 are then bent, after which a multi-chamber flat tube according to the invention, for example as shown in FIG. 12 , is produced.
  • FIG. 15 shows a further exemplary embodiment of a multi-chamber flat tube 1000 according to the invention.
  • the web backs 1010, 1020, 1030 and 1040 of the webs not shown here are formed wave-shaped, so that the flow of a medium through one of the chambers 1050, 1060 or 1070 of this shape, whereby the heat transfer to a medium outside the multi-chamber pipe 1000 improves is.
  • FIG. 15a Another variant of a multi-chamber flat tube according to the invention is shown in FIG. 15a .
  • the wave forms of the web spines 1110, 1120, 1130 and 1140 are displaced in the longitudinal direction of the webs against each other such that the flow chambers 1150, 1160 and 1170 have tapers 1180 and spacers 1190.
  • the heat transfer compared to an arrangement as shown in Fig. 15 is increased again.

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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)

Claims (12)

  1. Tube plat à chambres multiples fabriqué à partir d'une bande de tôle, comprenant un cordon de soudure longitudinal et au moins une âme repliée (3, 4 ou 5) qui présente deux parois ayant une surface de contact commune (16), et une partie dorsale de l'âme qui est brasée avec au moins une paroi intérieure du tube plat, où l'âme est brasée dans la zone de la surface de contact (16), caractérisé en ce que l'âme présente au moins une ouverture (44) configurée comme une entaille et qui part de la partie dorsale (45) de l'âme.
  2. Tube plat à chambres multiples fabriqué à partir d'une bande de tôle, comprenant un cordon de soudure longitudinal et au moins deux âmes repliées qui présentent respectivement deux parois ayant une surface de contact commune, et une partie dorsale de l'âme, et sont brasées respectivement dans la zone de la surface de contact, où les parties dorsales, respectivement de deux âmes, sont brasées ensemble, caractérisé en ce qu'au moins une âme (130, 140) présente au moins une ouverture (150, 160) configurée comme une entaille et qui part de la partie dorsale (110, 120) de l'âme.
  3. Tube plat à chambres multiples selon la revendication 2, caractérisé en ce que chacune des âmes, au moins au nombre de deux, présente au moins une ouverture, et en ce qu'au moins deux ouvertures sont placées l'une en face de l'autre.
  4. Tube plat à chambres multiples selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'au moins une âme est disposée perpendiculairement à une paroi du tube.
  5. Tube plat à chambres multiples selon l'une quelconque des revendications 1 à 4, caractérisé en ce que plusieurs ouvertures (12, 33, 34, 40, 44) sont disposées à des intervalles réguliers, dans la direction longitudinale du tube plat (1).
  6. Tube plat à chambres multiples selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la surface de section des ouvertures (12, 33, 34, 40, 44) d'une âme est à peu près égale à une valeur comprise entre 5 % et 10 % de la surface de l'âme sans ouvertures (longueur l x hauteur h), c'est-à-dire que le rapport d'ouverture V se trouve dans la plage égale à 5 % ≤ V ≤ 10 %.
  7. Tube plat à chambres multiples selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les ouvertures sont configurées comme des trous poinçonnés.
  8. Tube plat à chambres multiples selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les entailles (44) présentent une section à peu près triangulaire.
  9. Tube plat à chambres multiples selon l'une quelconque des revendications 2 à 8, caractérisé en ce que le contour extérieur des ouvertures (12) présente un intervalle minimum x par rapport à la paroi intérieure (30, 31) du tube plat (32).
  10. Procédé de fabrication d'un tube plat à chambres multiples selon l'une quelconque des revendications 1 à 9, caractérisé par les étapes de procédé suivantes consistant :
    - à fournir une bande de tôle plate (60) sans fin,
    - à découper les entailles (89) d'après un modèle prédéfini (61, 62, 63),
    - à replier les âmes (68, 69, 70), de sorte qu'une entaille se superpose à une entaille,
    - à procéder au formage, pour obtenir une section fermée (60.6) du tube plat à chambres multiples, et
    - à braser les parties dorsales des âmes, avec la paroi intérieure du tube plat, ou bien, le cas échéant, à braser ensemble respectivement deux parties dorsales des âmes et à braser le cordon de soudure longitudinal.
  11. Procédé de fabrication d'un tube plat à chambres multiples selon l'une quelconque des revendications 1 à 9, caractérisé par les étapes de procédé suivantes consistant :
    - à fournir et à amener une bande de tôle plate (80) sans fin,
    - à replier les âmes (84, 85, 86),
    - à former des entailles (89) dans les parties dorsales des âmes, en procédant par estampage, par laminage ou par roulage,
    - à procéder au formage, pour obtenir une section fermée (80.6) du tube plat à chambres multiples, et
    - à braser les parties dorsales des âmes, avec la paroi intérieure du tube plat, ou bien, le cas échéant, à braser ensemble respectivement deux parties dorsales des âmes et à braser le cordon de soudure longitudinal.
  12. Échangeur de chaleur, en particulier dans un véhicule automobile, comprenant au moins un collecteur et au moins un tube plat à chambres multiples débouchant dans le collecteur, caractérisé en ce qu'au moins un tube plat à chambres multiples est configuré selon l'une quelconque des revendications 1 à 9.
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 EP1253391A1 (fr) 2002-10-30
EP1253391B1 true EP1253391B1 (fr) 2006-06-28

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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) DE10212300A1 (fr)
ES (1) ES2266331T3 (fr)

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DE50207354D1 (de) 2006-08-10
US6622785B2 (en) 2003-09-23
EP1253391A1 (fr) 2002-10-30
US20020174979A1 (en) 2002-11-28
ES2266331T3 (es) 2007-03-01
ATE331927T1 (de) 2006-07-15

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