EP1878989A2 - Tube aplati pour échangeur de chaleur et échangeur de chaleur à tubes aplatis - Google Patents

Tube aplati pour échangeur de chaleur et échangeur de chaleur à tubes aplatis Download PDF

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Publication number
EP1878989A2
EP1878989A2 EP07013077A EP07013077A EP1878989A2 EP 1878989 A2 EP1878989 A2 EP 1878989A2 EP 07013077 A EP07013077 A EP 07013077A EP 07013077 A EP07013077 A EP 07013077A EP 1878989 A2 EP1878989 A2 EP 1878989A2
Authority
EP
European Patent Office
Prior art keywords
flat tube
flat
metal strip
heat exchanger
region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07013077A
Other languages
German (de)
English (en)
Other versions
EP1878989A3 (fr
Inventor
Andreas Eilemann
Matthias Traub
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 EP1878989A2 publication Critical patent/EP1878989A2/fr
Publication of EP1878989A3 publication Critical patent/EP1878989A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • 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

Definitions

  • the invention relates to a flat tube for a heat exchanger according to the preamble of claim 1, known by the DE 37 25 602 A1 the applicant, and a heat exchanger according to the preamble of claim 16, known by the DE 197 52 139 A1 the applicant.
  • Flat tubes for heat exchangers are known in many variants, for. Example, as, extruded multi-chamber tubes or flat tubes, which are made of an endless metal belt, unwound from a metal band wrap (coil), by forming the metal strip and subsequent soldering and / or welding produced.
  • Flat tubes with a relatively large depth, ie with a large ratio of depth to thickness, are often formed as two- or multi-chamber tubes and therefore have longitudinally extending separating elements, in the form of dividers or beads, which are soldered or welded to the inner wall of the flat tube ,
  • the strip material is provided with a suitable solder plating prior to forming, with aluminum tubes with an Al-Si solder alloy.
  • the separating element is designed as a U-shaped bent supporting web, which rests with its two U-legs on the inside of the flat tube and is soldered thereto.
  • the support bar thus has essentially two functions, namely an increase in the internal pressure resistance of the flat tube and a separation of the total cross section into two chambers or two discrete flow channels.
  • the known flat tube has a thickness that is constant in the direction of the depth, that is to say the direction of flow of the air, ie essentially flat longitudinal sides.
  • the flat tubes form with secondary surfaces such.
  • B. corrugated fins a brazed tube / fin block, which is part of a heat exchanger.
  • the well-known flat tube has a partition and smooth longitudinal sides - a sealing of the pipe ends in the tube sheet and with respect to the longitudinal partition prepares soldering problems, which, however, by the DE 197 52 139 A1 have been solved to the Applicant to the effect that on the one hand flat tubes with longitudinal beads formed separating webs and on the other hand arranged in the collecting box longitudinal partition with recesses on its lower edge, ie the tube bottom and the tube ends facing side, are provided.
  • the Longitudinal partition wall engages in the region of the longitudinal corrugations, the pipe ends, wherein the beads come into contact with the recesses and thereby allow a dense soldering. Therefore, the use of longitudinal beads as a separator in flat tubes advantageous.
  • a protective plating eg a known alloy with the commercial designation AA 7072
  • the known divider is formed in the form of a longitudinal bead by soldering the inner sides, a protective cladding in this flat tube type can not be used.
  • a mutual recess in the form of a longitudinal bead is provided in the region of the separating and / or supporting element.
  • the flat tube according to the invention can be used as a "bead tube" known from the prior art and can therefore be perfectly soldered, particularly with respect to a dividing wall a corrosion-inhibiting layer, in particular a non-melting protective cladding can be provided, as in the region of the separation and / or support element no longer protective cladding on protective cladding, but a solder plating applied on the outside comes into contact with an applied on the inside Schutzplatttechnik and thus a flawless
  • the flat tube according to the invention is independent of tolerance-related fluctuations in the width of the metal strip unwound from the coil, because the free U-leg can be made variable in its length to compensate for such tolerance variations.
  • the separating and / or supporting element has generally - as expressed by the term - two functions, namely the separation and the support or Weganker Quant. Both functions need not be met simultaneously, for example, the separation may be interrupted, so that a pressure or flow compensation between the two chambers or flow channels is possible.
  • the flat tube according to the invention is made of a metal strip whose edge strips are preferably brought together in the middle of the flat tube, wherein one longitudinal side is continuous and the other longitudinal side forms a shock (outer edge of the edge strip). In order to ensure a clean and tight soldering with the heat exchanger, in particular its tube sheet, it is provided that the shock, z. B.
  • the bead-shaped depressions of the flat tube can in principle have any desired shape, but concavely curved or trapezoidal depressions are preferred.
  • the thickness d i in the region of the depressions is at least four times the pipe wall or strip material thickness t.
  • four material layers are directly adjacent to each other.
  • the preferred upper limit for the thickness in the bead area is smaller by two tube wall thicknesses than the total thickness d t of the flat tube.
  • the U-legs have a distance d F , which corresponds to a maximum of four times the material thickness t, preferably twice and particularly preferably the simple pipe wall thickness t.
  • d F 0 results as an advantage a particularly good seal with a longitudinal partition wall after soldering.
  • At a distance of the U-legs d F > 0 results in the advantage of a certain elasticity, which acts as a tolerance compensation during assembly of the flat tube in the tube sheet.
  • a further preferred embodiment relates to the dimensions of a trapezoidal depression, which is characterized by an inner width w i and an outer width W o .
  • the inner width is preferably set in a range of 0.6 mm ⁇ w i ⁇ 2.5 mm, more preferably 1.0 mm ⁇ w i ⁇ 2.0 mm.
  • the outer width has an upper limit of W o ⁇ 4 mm and is in particular in a range 2 mm ⁇ W o ⁇ 3.2 mm.
  • the remaining dimensions of the flat tube correspond to those which are known from the prior art.
  • the inventive design of the separating and / or supporting element in the form of a U-shaped fold with a free U-leg allows a tolerance compensation of the width of the metal strip. Due to its production, this has certain fluctuations, which are generally not conducive to exact pipe production. Such width variations can be compensated by a variable length of the free U-leg.
  • the leg length u L can be reduced to half the length to compensate for variations in the width of the metal strip.
  • the outer contour of the flat tube according to the invention should always be the same, ie the impact must always be at the same point.
  • the free U-leg of the U-shaped fold with the inner tube wall forms a contact point, which soldered.
  • at least one of these two curved formed to be soldered surfaces is, so preferably a curved rests on a flat surface and soldered.
  • the object of the invention is also achieved by a heat exchanger with the features of claim 16.
  • the heat exchanger preferably has a longitudinal dividing wall in the collecting box, which separates it into an inlet chamber and an outlet chamber for a heat transfer fluid, preferably a coolant.
  • the flat tubes are, starting from the inlet chamber, double flow, ie flows through in opposite directions, so that the heat exchanger with the ambient air flowing through it in the cross-direct current or cross-counterflow is operable.
  • the deflection of the heat transfer fluid can be done either - when using only one header box - in the flat tube itself or in a second designed as a deflection box collection box.
  • the inside of the flat tubes can be provided with a corrosion layer, in particular a protective cladding, and that the tube ends received in the tube plate can be reliably sealed by soldering through a longitudinal dividing wall in the area of the longitudinal beads.
  • a corrosion layer in particular a protective cladding
  • This provides a heat exchanger with high reliability and pipe corrosion resistance on the primary side.
  • a heat exchanger in motor vehicles, in particular as a cooler, in particular coolant radiator, or as a radiator for a motor vehicle heating used. Coolant radiator and radiator are flowed through on the primary side by the coolant of the cooling circuit of the internal combustion engine and in special cases require corrosion protection (protective cladding) on the coolant side.
  • Fig. 1 shows a central section of a flat tube 1, not shown, which is designed as a two-chamber tube with a first chamber 2 (shown shortened) and a second chamber 3 (shown incomplete). Between two chambers 2, 3, a separating and / or supporting element 4 is arranged (hereinafter referred to as "separating element 4"), which separates both chambers 2, 3 from each other.
  • the chambers 2, 3 thus form discrete flow channels for a heat transfer fluid, z.
  • the flat tube 1 is made of a strip material, preferably a rolled aluminum sheet 5 with the wall thickness t.
  • the strip material or metal strip 5 is unwound from a winding (coil), not shown, and fed to a tube forming machine, not shown, which converts the initially flat metal strip in the illustrated cross-section.
  • the metal strip 5 has two edge strips 5a, 5b, wherein the edge strip 5a is part of a U-shaped inner fold 6 and the edge strip 5b forms part of the outer contour of the flat tube 1 with a joint 7.
  • the flat tube 1 has an upper longitudinal side 8 and a lower longitudinal side 9, which each have a trapezoidal recess 10, 11 in the region of the separating element 4.
  • the trapezoidal shape is characterized by an inner width w i and an outer width w o .
  • the flat tube 1 has a general thickness d t , while in the region of the recesses 10, 11 a having smaller thickness d l .
  • the U-shaped fold 6 has two mutually parallel U-legs 6a, 6b, which have a distance d F from each other.
  • the metal strip 5 is made of a core material, for. B. an aluminum alloy and has on its the tube outer wall forming side 5c a Lotplatt réelle, z. B. from an AlSi alloy and on its inside the tube forming side 5d a Schutzplatttechnik, z. B. according to the international designation AA 7072 on - the plating are not shown.
  • the inside of the flat tube has a Lotplatt réelle or a Lotplatttechnik with corrosion-inhibiting effect or a Lotplatt réelle arranged with a solder plating Schutzplatt mich.
  • the flat tube 1 shown above has the following dimensions or dimensional ranges:
  • the thickness d i in the region of the recesses 10, 11 is a function of the thickness d t of the flat tube 1 and the wall thickness t of the flat tube 1 and the metal strip 5 in the following range: 4t ⁇ d i ⁇ d t - 2t.
  • the upper limit for the distance d F is 4 t, ie four times the wall thickness , preferably in the double and particularly preferably in the simple wall thickness t.
  • the inner width w i of the trapezoidal recesses 10, 11 is selected in the following range: 0.6 ⁇ w i ⁇ 2.5 mm, in particular 0.8 ⁇ w i ⁇ 2.5 mm, in particular 1.0 ⁇ w i ⁇ 2.0 mm.
  • the outer width w o has a Upper limit of 4 mm and a preferred range of 2 mm ⁇ w o ⁇ 3.2 mm.
  • the free U-leg 6a has a length U L , which can be made variable depending on a production-related, fluctuating width of the metal strip 5.
  • the leg length u L can be smaller with a smaller bandwidth. The tolerance deviation in the width of the metal strip 5 thus determines the length u L.
  • FIG. 2 shows a modification of the separating element 4 shown in FIG. 1, which is shown here as an inner fold 20, which has a convexly curved free leg 21 which bears against a flat surface 22 of the trapezoidal depression 23.
  • the flat surface 22 and the curved surface 21 thus form a contact point with line contact. This results in a good soldering, as can form in the soldering gap Lötmenisken.
  • FIG. 3 shows a further modification of the separating element 4 according to FIG. 1, which is designed here as a U-shaped fold 30 with a straight free leg 31.
  • the recess 32 is concavely curved so that a curved inner surface 33 rests on the flat surface 31. This results in equally favorable soldering requirements as in the embodiment of FIG. 2.
  • the length u L of the free leg 41 corresponds to the inner width w i of the trapezoidal depression.
  • a fold 50 is shown with a shortened free leg 51.
  • the shortening of the free leg length from w l to w l / 2 results a smaller width of the metal strip, which can thus be compensated.
  • Fig. 6 shows a detail of the shock 7 shown in Fig. 1, here designated by the reference numeral 60.
  • the joint 60 ie one of the two longitudinal edges of the metal strip has an inclined surface which bears against the bevel of the recess 61 and thus forms a relatively smooth outer contour for the flat tube. This improves the soldering when receiving the pipe ends in openings of a tube plate.
  • Fig. 7 shows a modified embodiment of a joint 70 which is chamfered in alignment with the longitudinal wall 71 and thus also gives a relatively smooth outer contour.
  • the flat tube 1 shown in the drawing with bead-shaped depressions 10, 11 is preferably used for flat tube heat exchanger, which are not shown here, but the above-mentioned prior art, in particular the DE 197 52 139 according to the Applicant - the latter document is therefore fully incorporated in the subject matter of the present application.
  • the flat tubes of the known heat exchanger can be substituted by the flat tubes according to the invention described above, wherein at the same time a longitudinal partition wall can be arranged in the collecting box, which includes the pipe ends in the region of their longitudinal beads and seals there.
  • a heat exchanger can be provided with a arranged on the inside of the tube protective cladding.
  • Such a heat exchanger is preferably used as a coolant radiator or radiator for motor vehicles.

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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)
EP07013077A 2006-07-06 2007-07-04 Tube aplati pour échangeur de chaleur et échangeur de chaleur à tubes aplatis Withdrawn EP1878989A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006031306 2006-07-06

Publications (2)

Publication Number Publication Date
EP1878989A2 true EP1878989A2 (fr) 2008-01-16
EP1878989A3 EP1878989A3 (fr) 2013-02-27

Family

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Application Number Title Priority Date Filing Date
EP07013077A Withdrawn EP1878989A3 (fr) 2006-07-06 2007-07-04 Tube aplati pour échangeur de chaleur et échangeur de chaleur à tubes aplatis

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EP (1) EP1878989A3 (fr)
DE (1) DE102007031249A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107966064A (zh) * 2013-01-14 2018-04-27 翰昂系统有限公司 热交换器用管

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0302232A1 (fr) * 1987-08-01 1989-02-08 Behr GmbH & Co. Tube plat pour un échangeur de chaleur
US5765634A (en) * 1996-06-05 1998-06-16 Valeo Thermique Moteur Flat heat exchanger tube with a central partition
FR2765817A1 (fr) * 1997-07-11 1999-01-15 Valeo Thermique Moteur Sa Tube plie pour un echangeur de chaleur, notamment de vehicule automobile
DE19752139A1 (de) * 1997-11-25 1999-05-27 Behr Gmbh & Co Wärmeübertrager für ein Kraftfahrzeug
EP0994320A2 (fr) * 1998-10-17 2000-04-19 Arbonia Ag Radiateur avec au-moins deux tubes plats superposés
FR2811746A1 (fr) * 2000-07-12 2002-01-18 Valeo Thermique Moteur Sa Tube pour echangeur de chaleur, en particulier de vehicule automobile, et echangeur de chaleur comportant de tels tubes
EP1630513A2 (fr) * 2004-08-24 2006-03-01 Behr GmbH & Co. KG Tube plat pour echangeur de chaleur, en particulier pour véhicules et méthode de production

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0302232A1 (fr) * 1987-08-01 1989-02-08 Behr GmbH & Co. Tube plat pour un échangeur de chaleur
US5765634A (en) * 1996-06-05 1998-06-16 Valeo Thermique Moteur Flat heat exchanger tube with a central partition
FR2765817A1 (fr) * 1997-07-11 1999-01-15 Valeo Thermique Moteur Sa Tube plie pour un echangeur de chaleur, notamment de vehicule automobile
DE19752139A1 (de) * 1997-11-25 1999-05-27 Behr Gmbh & Co Wärmeübertrager für ein Kraftfahrzeug
EP0994320A2 (fr) * 1998-10-17 2000-04-19 Arbonia Ag Radiateur avec au-moins deux tubes plats superposés
FR2811746A1 (fr) * 2000-07-12 2002-01-18 Valeo Thermique Moteur Sa Tube pour echangeur de chaleur, en particulier de vehicule automobile, et echangeur de chaleur comportant de tels tubes
EP1630513A2 (fr) * 2004-08-24 2006-03-01 Behr GmbH & Co. KG Tube plat pour echangeur de chaleur, en particulier pour véhicules et méthode de production

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107966064A (zh) * 2013-01-14 2018-04-27 翰昂系统有限公司 热交换器用管

Also Published As

Publication number Publication date
DE102007031249A1 (de) 2008-01-10
EP1878989A3 (fr) 2013-02-27

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