EP2691722A1 - Heat exchanger tube, and corresponding heat exchanger production method - Google Patents
Heat exchanger tube, and corresponding heat exchanger production methodInfo
- Publication number
- EP2691722A1 EP2691722A1 EP12713117.5A EP12713117A EP2691722A1 EP 2691722 A1 EP2691722 A1 EP 2691722A1 EP 12713117 A EP12713117 A EP 12713117A EP 2691722 A1 EP2691722 A1 EP 2691722A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- thickness
- strip
- zones
- portions
- 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
Links
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
-
- 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
-
- 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
- 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
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2225/00—Reinforcing means
- F28F2225/04—Reinforcing means for 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 heat exchanger tube, in particular for motor vehicles, a heat exchanger comprising a bundle of such tubes, and a method for obtaining such a tube.
- the invention relates to the field of heat exchangers, especially for motor vehicles.
- the heat exchangers conventionally comprise a bundle of tubes and two collector plates traversed by the ends of the tubes of the bundle of tubes and capped by covers of fluid distribution boxes. Interlayers may be provided between the tubes of said bundle to improve heat exchange.
- the heat exchanger tubes can be subjected to many stresses such as a high speed impact with an object (for example, a gravel) coming from the external environment.
- the heat exchanger tubes are therefore subjected to external stresses.
- the tubes are also solicited from the inside by the flow of the fluid. Indeed, in operation, the tubes are subjected to thermal stresses, pressure, expansion.
- a known solution is to allow the tube to withstand such an impact so as to avoid any leakage of fluid, or to internal stresses, increasing locally the thickness of the tube wall when it is a tube extruded.
- the reinforcement of the tube can not be carried out simple way by an over-thickness of material as is the case for an extruded tube.
- the bent tubes there is known for example a solution according to which the wall of the tube is folded several times on itself horizontally at a side or nose of the tube increasing the thickness of material in the tube nose.
- a disadvantage lies in the fact that the height of the tube is thus a function of the material thickness thereof and corresponds to the number of plies.
- No. 6,192,977 shows yet another solution in which one end of the tube consists of the overlap of the wall of the tube.
- this solution is difficult to control for the tubes of low heights, for example of the order of 1 mm, or even 1.75 mm.
- the object of the invention is to propose a solution for a bent tube providing the tube with sufficient resistance to external stresses and internal stresses without presenting the aforementioned drawbacks of the prior art.
- the invention relates to a heat exchanger tube made by folding a metal strip characterized in that said strip has a variable thickness between at least a first thickness and at least a second thickness greater than said first thickness, and in that said tube has first thinned zones and second reinforced zones situated at places of strong mechanical stress, said first zones being formed by first portions of said first thickness strip and said second reinforced zones being formed by second portions of said strip of second thickness.
- Said tube may further comprise one or more of the following characteristics, taken separately or in combination:
- variable thickness of said strip is obtained by localized thinning of said bandaged
- said strip has opposite edges of second thickness and said tube has a second reinforced zone obtained by folding said borders and joining said folded edges,
- said tube has a substantially "B" -shaped cross-section defining two parallel fluid circulation channels delimited by a partition,
- said partition is formed by joining said folded edges of said metal strip
- said tube has two large opposite lateral faces connected by two small lateral faces, said small lateral faces being reinforced second zones,
- said tube has at least one contact zone between at least one edge of said strip and the inner surface of said tube formed from said folded strip, said at least one edge and said internal surface forming respectively reinforced second zones.
- the invention also relates to a heat exchanger, in particular for a motor vehicle, characterized in that it comprises a bundle of tubes as defined above.
- the invention also relates to a method for obtaining such a heat exchanger tube, characterized in that it comprises the following steps:
- said metal strip is folded at at least a second portion, and a junction is made at at least two second portions of said strip so as to form a tube having first thinned zones and second reinforced zones; being at locations of high mechanical stress, said first zones being formed by first portions of said first thickness strip and said second reinforced zones being formed by second portions of said second thickness strip.
- said metal strip is cut to a desired length after folding.
- the metal strip can be thinned locally by rolling.
- the method comprises a preliminary step of cutting said metal strip to a desired length before folding.
- the metal strip can be thinned locally by stamping.
- said metal strip is folded so as to form a tube having a cross section substantially "B", defining two parallel channels of fluid circulation, delimited by a partition.
- FIG. 1 is a partial and schematic representation of a heat exchanger
- FIG. 2a is a cross-sectional view of a tube of the exchanger of FIG. 1 comprising tabs
- FIG. 2b is a cross-sectional view of a tube of the exchanger of FIG. 1 without spacers
- FIG. 3a schematically illustrates a metal strip serving for the formation of the tube of FIG. 2a, FIG. 3a not being representative of the dimensions of the strip for forming the tube;
- FIG. 3b schematically illustrates the metal strip of thinned FIG. 3a
- FIG. 4 represents the steps of a method for obtaining the tube of FIG. 2a.
- the invention relates to tubes 1 for heat exchangers.
- radiators for heating are radiators for cooling, charge air cooling radiators, or even air conditioning condensers for motor vehicles.
- a heat exchanger 3 conventionally comprises a bundle of longitudinal tubes 1 (see FIGS. 1 and 2a) mounted between two distribution boxes in which a first fluid circulates, via collecting plates 5 (Partially and schematically represented) arranged transversely with respect to the tubes 1 and having orifices (not shown) for receiving the ends of these tubes 1.
- Disruptors 7 can be arranged inside the tubes 1 so as to disturb the flow of the first fluid in the tubes 1 by increasing the exchange surface.
- These disruptors 7 are for example brazed to the tubes 1 at the vertices 7a of their corrugations and for example at the ends 7b of the disrupters 7.
- the disturbance generated by the presence of these disturbers 7 in the tubes 1 facilitates the heat exchange between the two fluids.
- These disruptors 7 are well known to those skilled in the art and are not described in more detail herein. This example is valid for the operation of a condenser.
- the tubes 1 can be separated from each other by spacers 9 (FIG.
- FIGs 2a, 2b show a sectional view of a tube 1 of such a heat exchanger 3.
- a tube 1 is made from a metal strip 11 (Figure 3a).
- the band 11 is shown schematically and illustratively in Figure 3a.
- This metal strip 11 is thinned ( Figure 3b) and folded. This is called “folded tube”.
- the metal strip 11 has two opposite edges 11a, 11b which are connected to form the folded tube 1 shown in FIG. 2b.
- the metal strip 11 ( Figures 3a, 3b) is preferably aluminum or aluminum alloy.
- the metal strip is for example aluminum or copper.
- the metal strip 11 is for example of generally rectangular shape and comprises a first face called outer face 13 and a second face said inner face 15 parallel to the outer face 13 and opposite thereto.
- the terms “internal” and “external” are defined with respect to the inside and outside of the folded tube 1.
- the metal strip 11 (see FIG. 3b) has a variable thickness. This variable thickness can be obtained by localized thinning of the strip 11, for example by rolling. According to the example illustrated in FIG. 3b, the strip 11 has first portions PI and second portions P2 of different thicknesses. These portions P1, P2 are schematically illustrated in FIG. 3b and the dimensions of the strip 11 and portions P1, P2 are not to scale.
- the first portions PI have a thickness ei smaller than the thickness e 2 of the second portions P2.
- the thickness e 2 is of the order of 0.23 mm and the thickness e j is of the order of 0.15 mm.
- first portions PI and second portions P2 are defined according to the force exerted on the tube 1 folded.
- the thicknesses e_i and e 2 are therefore determined as a function of this effort.
- the first portions PI are intended to form first zones ZI of the tube 1, and the second portions P2 are intended to form second zones Z2.
- the second zones Z2 of greater thickness e 2 are thus reinforced with respect to the first zones ZI of thinner thickness ei which are called thinned zones.
- the second zones Z2 correspond to the zones of the tube 1 which are the most solicited.
- the tube 1 formed has a substantially "B" cross section.
- other sections may be provided, for example of substantially oblong shape.
- the cross-section at "B" of the tube 1 illustrated has two parallel fluid circulation channels juxtaposed 17a and 17b and separated by a partition 19 forming a spacer.
- the metal strip 11 is folded so as to form the envelope of the two parallel channels juxtaposed 17a and 17b. More specifically, the metal strip 11 is folded so that its inner face 15 delimits the two channels 17a, 17b.
- the partition 19 is for example made by folding substantially 90 ° two opposite edges 11a and 11b of the metal strip 11, for example the longitudinal edges of the strip 11. Then, these edges 11a, 11b folded are backed against each other the other to jointly form the partition 19.
- the outer face 13 at the edge 11a is opposite the outer face 13 at the opposite edge 11b.
- a "B" folded tube has been described here. Of course, one can provide any type of folding or electro-welded tubes.
- the junction zone of the borders 11a, 11b of the metal strip to form the tube 1 can be solicited and is according to the example shown a second reinforced zone Z2.
- the opposite edges 11a, 11b may be second portions P2 of second thickness e 2 of the strip 11.
- the latter thus has a second reinforced zone Z2.
- This second reinforced zone Z2 is obtained by folding edges 11a, 11b of thickness e 2 and joining these edges 11a, 11b folded.
- the end faces of the borders 11a, 11b are substantially in contact with the inner face 15 of the metal strip 11.
- the outer face 13 of the band 11 forms the outer surface 21 of the tube 1 thus formed, and the inner face 15 of the band 11 forms the inner surface 23 of the tube 1 thus formed.
- the inner surface 23 at this contact area corresponds to a second portion P2 of the strip 11 so as to form a second zone Z2 reinforced.
- the outer surface 21 of the folded tube 1 has two large outer faces 21a, 21b opposite and which are connected by two small side faces 21c and 21d, for example substantially curved.
- the small side faces 21c, 21d of connection form second zones Z2 of the tube 1.
- the strip 11 is folded at two second portions P2.
- the metal strip 11 is then thinned before being folded to form the tube 1 which has, according to the illustrated example, legs of a first thickness ei forming the large lateral faces 21a, 21b of the form "B" outside the borders 11a, 11b of the metal strip 11 and also outside the inner surface 23 intended to be in contact with the ends of these edges 11a, 11b a folded band 11.
- legs of a first thickness ei forming the large lateral faces 21a, 21b of the form "B" outside the borders 11a, 11b of the metal strip 11 and also outside the inner surface 23 intended to be in contact with the ends of these edges 11a, 11b a folded band 11.
- These legs forming first ZI areas thinned.
- the borders 11a, 11b and the contact area of the inner surface 23 having a second thickness e 2 forming second zones Z2 reinforced.
- a tube 1 folded so as to define a single fluid circulation channel it is possible to provide a tube 1 folded so as to define a single fluid circulation channel.
- the metal strip 11 is folded so as to form an envelope of this channel, this strip 11 being folded at a second portion P2 of the strip 11 so as to form a second reinforced zone Z2 of the tube 1 folded .
- edges 11a, 11b of the band can be folded and leaning against each other.
- the junction of the edges 11a, 11b may also form a second reinforced zone Z2 of the tube; the borders 11a, 11b being for example formed at second portions P2 of the strip 11.
- the borders 1a, 1b of the band 11 can be superimposed.
- a first step El the metal strip 11 is thinned locally.
- This thinning can for example be done by rolling.
- the first PI portions are for example passed between two rollers to reduce their thickness to the thickness e j _ desired, for example 0.15 mm with respect to an initial thickness of 0.23mm.
- the strip 11 is bent or bent at at least a second portion P2 of the strip 11.
- This folding can be done by continuous scrolling of the metal strip 11 in a roller train.
- the strip 11 is folded at the two intermediate portions P2.
- the thinning step can be done during the folding of the strip 11.
- a junction is made at at least two second portions P2 so as to form the folded tube 1.
- a tube 1 folded at "B” is folded for example substantially at 90 ° the two end portions P2 forming the edges 11a and 11b of the strip 11, then we base these edges 11a, 11b folded against each other to jointly form the partition 19 defining the two channels 17a, 17b.
- the metal strip is cut beforehand to the desired length.
- the cut strip 11 can be thinned locally by stamping or "stamping" in English.
- Each piece of cut strip 11 can then be folded, for example by passing through a roller train.
- this folding can be done so as to obtain a tube folded substantially "B", or any other form.
- the tube 1 then has first thinned zones ZI and second zones Z2 reinforced, the first zones ZI being formed by first portions PI of the strip 11 and the second reinforced zones Z2 being formed by second portions P2 of said strip 11 of greater thickness than the first portions Pl.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Air-Conditioning For Vehicles (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1152705A FR2973490B1 (en) | 2011-03-31 | 2011-03-31 | THERMAL EXCHANGER TUBE, HEAT EXCHANGER AND CORRESPONDING PROCESSING METHOD |
PCT/EP2012/055790 WO2012131038A1 (en) | 2011-03-31 | 2012-03-30 | Heat exchanger tube, and corresponding heat exchanger production method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2691722A1 true EP2691722A1 (en) | 2014-02-05 |
EP2691722B1 EP2691722B1 (en) | 2018-02-07 |
Family
ID=45937351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12713117.5A Revoked EP2691722B1 (en) | 2011-03-31 | 2012-03-30 | Heat exchanger tube, and corresponding heat exchanger production method |
Country Status (6)
Country | Link |
---|---|
US (1) | US10989485B2 (en) |
EP (1) | EP2691722B1 (en) |
JP (2) | JP2014514529A (en) |
CN (1) | CN103688123B (en) |
FR (1) | FR2973490B1 (en) |
WO (1) | WO2012131038A1 (en) |
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SE539124C2 (en) * | 2014-04-22 | 2017-04-11 | Titanx Engine Cooling Holding Ab | Vehicle heat exchanger tubes and vehicle coolers including such tubes and ways of forming a vehicle heat exchanger tubes |
FR3036468A1 (en) * | 2015-05-22 | 2016-11-25 | Delphi Automotive Systems Lux | FLAT TUBE FOR THERMAL EXCHANGER |
FR3062901A1 (en) * | 2016-12-09 | 2018-08-17 | Valeo Systemes Thermiques | THERMAL HEAT EXCHANGER TUBE, HEAT EXCHANGER AND CORRESPONDING TUBE ASSEMBLY METHOD |
WO2019123024A1 (en) * | 2017-12-19 | 2019-06-27 | Subros Limited | Heat exchanger tube and a method of manufacturing thereof |
CN109604367B (en) * | 2018-12-24 | 2021-02-12 | 上海交通大学 | Roll bending forming device and method for variable-thickness folding type micro-channel flat tube |
JP7324096B2 (en) | 2019-09-13 | 2023-08-09 | 三菱重工業株式会社 | Cooling channel structure, burner and heat exchanger |
EP4273489A1 (en) * | 2022-05-03 | 2023-11-08 | Valeo Klimasysteme GmbH | A flat tube for a heat exchanger |
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-
2011
- 2011-03-31 FR FR1152705A patent/FR2973490B1/en active Active
-
2012
- 2012-03-30 WO PCT/EP2012/055790 patent/WO2012131038A1/en active Application Filing
- 2012-03-30 EP EP12713117.5A patent/EP2691722B1/en not_active Revoked
- 2012-03-30 CN CN201280026539.3A patent/CN103688123B/en active Active
- 2012-03-30 JP JP2014501652A patent/JP2014514529A/en active Pending
- 2012-03-30 US US14/008,734 patent/US10989485B2/en active Active
-
2016
- 2016-12-05 JP JP2016236186A patent/JP6437987B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
FR2973490A1 (en) | 2012-10-05 |
JP6437987B2 (en) | 2018-12-12 |
US10989485B2 (en) | 2021-04-27 |
CN103688123A (en) | 2014-03-26 |
CN103688123B (en) | 2016-11-16 |
FR2973490B1 (en) | 2018-05-18 |
JP2014514529A (en) | 2014-06-19 |
EP2691722B1 (en) | 2018-02-07 |
WO2012131038A1 (en) | 2012-10-04 |
US20150107812A1 (en) | 2015-04-23 |
JP2017101916A (en) | 2017-06-08 |
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