GB2299037A - Flat tube for a soldered heat exchanger and a method for its production - Google Patents

Flat tube for a soldered heat exchanger and a method for its production Download PDF

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Publication number
GB2299037A
GB2299037A GB9605008A GB9605008A GB2299037A GB 2299037 A GB2299037 A GB 2299037A GB 9605008 A GB9605008 A GB 9605008A GB 9605008 A GB9605008 A GB 9605008A GB 2299037 A GB2299037 A GB 2299037A
Authority
GB
United Kingdom
Prior art keywords
beads
tube
welding
longitudinal
welded
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
GB9605008A
Other versions
GB9605008D0 (en
GB2299037B (en
Inventor
Herbert Damsohn
Horst Haeffner
Klaus Lorenz
Martin Rilk
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 GB9605008D0 publication Critical patent/GB9605008D0/en
Publication of GB2299037A publication Critical patent/GB2299037A/en
Application granted granted Critical
Publication of GB2299037B publication Critical patent/GB2299037B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
    • F28F3/044—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being pontual, e.g. dimples
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/14—Making tubes from double flat material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/151—Making tubes with multiple passages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/04—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/06—Fastening; Joining by welding
    • F28F2275/067—Fastening; Joining by welding by laser welding

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)

Description

1 Flat tube for a soldered heat exchanqer and a method for its production
2299037 The invention relates to a flat tube for a soldered heat exchanger, particularly of aluminium, with a welded longitudinal edge and with beads which are stamped inwardly on the longitudinal sides and abut one another forming at least one partition extending longitudinally and dividing the internal space into chambers.
Flat tubes for the production of soldered heat exchangers are known (DE 40 26 988 A1) and are composed of a metal strip solder-plated on at least one side and provided with beads extending parallel to its longitudinal sides, the strip then being bent to the tube shape and welded on its abutting longitudinal edges. In order to form the heat exchangers, flat tubes of this type are then inserted with both ends in tube bases and are thus oriented with their longitudinal sides parallel to one another and are provided with corrugated ribbed strips disposed between them and serving to increase the transfer of heat. Heat exchangers made up in this manner are generally soldered in a complete soldering process in which an uncontrolled accumulation of too much solder may occur on the insides of the tubes. If an 2 application of fluxing agent is used, then it is difficult to introduce the fluxing agent into the tube uniformly and to remove the moisture from the tube again before soldering. Both circumstances may lead to the tube being either insufficiently leakproof or insufficiently firm in the region of the beads, which may lead to undesired damage owing to the internal pressure in operation. An undesired accumulation of solder may lead to disturbance of the flow which is also undesirable.
The object of the invention is to design a flat tube of the type mentioned at the beginning in a manner such that the disadvantages described do not arise so that, with the use of the flat tubes, heat exchangers can also be connected by soldering processes which require an application of fluxing agent.
This object is achieved, according to the invention, with a flat tube of the type mentioned at the beginning, by virtue of the fact that the beads are welded in their contact positions. This measure makes soldering inside the tube unnecessary and an application of fluxing agent with subsequent drying can take place relatively easily in all other connection positions of the flat tube and thus on the tube base or to the 3 corrugated ribbed strips, for example, by the Nocolok method, without difficulties arising with the accessibility of the parts to be supplied with fluxing agent or with the drying. Flat tubes according to the invention can therefore be used for the production of Nocolok-soldered heat exchangers.
In a development of the invention, a method may be provided for producing the flat tubes in which, first of all, longitudinal beads are stamped outwardly from a metal strip solder-plated at least on the side which will subsequently be on the outside, the beads abutting one another inside the tube after the bending of the metal strip to tube shape and the welding of the free longitudinal edges, and is characterized in that these abutting beads are welded longitudinally. Moreover, the welding may take place partially with a pulsed laser beam which advantageously follows the tube welding machine for producing the longitudinal seam.
It is, however, also possible to provide for continuous welding by means of inductive hot pressure welding for the welding of the beads, which takes place either before the welding of longitudinal bead or afterwards.
4 The invention is explained below with reference to an embodiment shown in the drawings, in which:
Figure 1 shows a metal strip which serves as the starting material for the production of a flat tube and is bent to the tube shape; Figure 2 shows the metal strip of Figure 1 in tube shape with welded longitudinal beads before the welding of the longitudinal seam; and Figure 3 is a partial view of a heat exchanger produced with the use of flat tubes according to Figure 2.
Figure 1 shows that, in order to produce the novel flat tube, a metal strip (1), particularly of aluminium is provided and, first of all, is equipped with two longitudinal beads (2) extending parallel to one another and stamped towards the same side, and with longitudinal edges (3a and 3b) bent upwards towards the same side as the beads. This metal strip (1) is provided, on its flat underside (4) which does not have projecting beads (2), with an A1Si plating so that soldering to other parts can be carried out subsequently according to the Nocolok process.
As shown by a broken line, the metal strip (1) is then bent upwardly in the direction of the arrow (6) about its centre-line (5) so that its longitudinal edge (3bl) faces the longitudinal edge (3a). The bead (2) disposed on the side with the longitudinal edge (3b) then reaches the position (21) and, with further bending in the direction of the arrow (7), abuts the bead (2) as shown in Figure 2. The metal strip (1) already bent to tube shape according to Figure 2 is then welded on the line (8) on which the beads (2) abut one another, for example, by inductive hot pressure welding. The longitudinal seam (9) between the longitudinal edges (3a and 3b) is then formed with the aid of a tube welding machine.
Alternatively, the welding on the line (8) may be formed by a pulsed laser beam which, for example, is made to follow the tube welding machine for forming the weld seam (9). Naturally, it would also be possible to form the weld seam formed by inductive hot pressure welding between the beads (2) after the formation of the weld seam (9).
The flat tube (10) shown in Figure 2 is now assembled with a plurality of others according to Figure 3 in a manner such that respective longitudinal sides of the flat tubes (10) are 6 disposed parallel to one another. This is achieved by virtue of the fact that the ends of the flat tubes (10) are inserted in tube bases (11) which are then closed in known manner by a collector. A corrugated strip (12) is inserted between each pair of adjacent flat tubes (10) and, in the embodiment shown by way of example, is provided, in the region of the summits of its corrugations, with respective stamped tabs (13) which are disposed in the inwardly-pressed portions of the beads (2) of the flat tubes to locate the corrugated strip (12). The flat tubes (10) formed according to the invention and used for this so-called coffering process are distinguished by the fact that they are particularly stable and rigid for assembly and are connected to the corrugated strips (12) with a positive fit.
When the coffering process has been completed in the manner described, the heat exchanger thus assembled can be soldered, for example, in the Nocolok process. This requires the application of fluxing agent. It can easily be seen from Figure 3, however, that this fluxing agent can easily be applied, for example, by spraying of the spaces between the flat pipes (10) and can reach the gaps to be soldered between flat tubes (10) and tube 7 bases (11), on the one hand, and between the summits of the corrugations of the corrugated strips (12) and the longitudinal sides of the flat tubes (10), on the other hand. The fluxing agent thus applied is then dried so that leakproof soldering can subsequently take place by the transfer of the coffered heat exchanger according to Figure 3 into a soldering furnace.
As can easily be seen, with this soldering process, the admission of solder or fluxing agent into the interiors of the flat tubes (10), which gives rise to undesired accumulation of solder therein or leads to the disadvantage that the flux is not uniformly distributed in the tube and cannot be dried thoroughly, is not necessary. The novel heat exchanger according to Figure 3 is therefore a soldered heat exchanger but is produced with the use of exclusively welded flat tubes (10).
8

Claims (8)

1. Flat tube of metal, for a soldered heat exchanger, with a welded longitudinal edge and with beads which are stamped inwardly on the longitudinal sides and abut one another forming at least one partition extending longitudinally and dividing the internal space into chambers, characterized in that the beads are welded in their contact positions.
2. Method of producing flat tubes according to Claim 1, in which, first of all, longitudinal beads are stamped outwardly from a metal strip solder-plated at least on the side which will subsequently be on the outside, the beads abutting one another inside the tube after the bending of the metal strip to tube shape and the welding of the free longitudinal edges, characterized in tha the beads are welded longitudinally.
3. Method according to Claim 2, characterized by partial welding of the bead with a pulsed laser beam.
4. Method according to Claim 3, characterized in that the laser beam follows the 9 tube welding machine for forming the longitudinal seam.
5. Method according to Claim 2, characterized by a continuous weld with the aid of an inductive hot pressure welding method.
6. Method according to Claim 5, characterized in that the welding of the beads takes place before the welding of the longitudinal seam or vice versa.
7. Use of flat tubes according to Claim 1 for heat exchangers of which the flat tubes arranged parallel to one another are soldered in tube bases and to corrugated ribs disposed between them in the Nocolok process.
8. Flat tube according to Claim 1, characterised in that the metal is aluminium.
8. Flat tube according to Claim 1, characterised in that the metal is aluminium.
Amendments to the claims have been filed as follows 1. Flat tube of metal for a soldered heat exchanger, the tube being solder-plated on the outside only, having a welded longitudinal edge and having concave beads stamped inwardly on the longitudinal sides, the beads abutting one another to form at least one partition extending longitudinally and dividing the internal space into chambers, wherein the beads are welded in their contact positions.
2. Method of producing flat tubes according to Claim 1, in w.h.,c.-i longitudinal beads are stamped from cne side in a metal strip, the strip is bent into a tube shape with beads abutting one another, the free longitudinal edges of the tube shape are welded, and the abutting beads are welded longitudinally.
3. Method according to Claim 2, characterized by partial welding of the bead with a pulsed laser beam.
4. Method according to Claim 3, characterized in that the laser beam follows the 0 tube welding machine for forming the longitudinal seam.
5. Method according to Claim 2, characterized by a continuous weld with the aid of an inductive hot pressure welding method.
6. Method according to Claim 5, characterized in that the welding of the beads takes place before the welding of the longitudinal seam or vice versa.
7. Use of flat tubes according to Claim 1 for heat exchangers of which the flat tubes arranged parallel to one another are soldered in tube bases and to corrugated ribs disposed between them in the llocolok process.
GB9605008A 1995-03-22 1996-03-08 Flat tube for a soldered heat exchanger and a method for its production Expired - Fee Related GB2299037B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1995110283 DE19510283A1 (en) 1995-03-22 1995-03-22 Flat tube for a soldered heat exchanger and process for its manufacture

Publications (3)

Publication Number Publication Date
GB9605008D0 GB9605008D0 (en) 1996-05-08
GB2299037A true GB2299037A (en) 1996-09-25
GB2299037B GB2299037B (en) 1997-10-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB9605008A Expired - Fee Related GB2299037B (en) 1995-03-22 1996-03-08 Flat tube for a soldered heat exchanger and a method for its production

Country Status (4)

Country Link
DE (1) DE19510283A1 (en)
ES (1) ES2136487B1 (en)
FR (1) FR2732101B1 (en)
GB (1) GB2299037B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2339399A (en) * 1998-07-10 2000-01-26 Metallifacture Ltd Method of manufacturing a manifold and related improvements
EP1132706A2 (en) * 2000-03-06 2001-09-12 Mitsubishi Heavy Industries, Ltd. Heat exchanger
WO2007010226A1 (en) * 2005-07-22 2007-01-25 Michael Tate Exhaust gas heat exchanger

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EP0994320B1 (en) * 1998-10-17 2004-11-17 Arbonia Ag Radiator with at least two stacked flat tubes
DE19849449C2 (en) * 1998-10-28 2003-05-28 Hanf Carl Elino Ind Ofenbau Method and system for connecting heat exchanger parts
US6192977B1 (en) * 1999-09-29 2001-02-27 Valeo Thermique Moteur Tube for heat exchanger
DE10033070A1 (en) 2000-03-31 2002-01-17 Modine Mfg Co Radiators for motor vehicles and manufacturing processes
DE10016113A1 (en) * 2000-03-31 2001-10-04 Modine Mfg Co Radiator for motor vehicle comprises block of flat tubes, between which are ribs, ends of tubes being bent around to issue into opposing collection boxes
DE10147192A1 (en) 2001-09-25 2003-04-17 Modine Mfg Co Heat exchanger with a finned flat tube block and manufacturing process
DE10201512A1 (en) 2002-01-17 2003-07-31 Behr Gmbh & Co Multi-chamber flat tube
DE10226753A1 (en) * 2002-06-14 2004-01-08 Behr Gmbh & Co. heat exchangers
DE10343905A1 (en) * 2003-09-19 2005-06-09 Behr Gmbh & Co. Kg Soldered heat transfer network
DE102005013777A1 (en) 2005-03-22 2006-09-28 Behr Gmbh & Co. Kg Pipe for a heat exchanger
DE102008031614A1 (en) 2008-07-07 2010-01-14 Behr Gmbh & Co. Kg Heat exchanger, in particular heat exchanger of a motor vehicle, and method for producing a cooling tube of a heat exchanger
DE102009032782A1 (en) * 2009-07-10 2011-01-13 Behr Industry Gmbh & Co. Kg Heat exchanger, in particular for an internal combustion engine
DE102009041406B3 (en) * 2009-09-12 2011-03-10 Thesys Gmbh Heat exchanger for use as evaporator in energy recovery plant of motor vehicle, has smaller flat tube arranged in larger flat tube, where broad sides of walls of larger flat tube lie against each other, when tubes are coaxially arranged
DE102010052621B4 (en) * 2010-11-29 2014-03-13 Benteler Automobiltechnik Gmbh Method for producing a heat exchanger
CN102636050A (en) * 2012-04-27 2012-08-15 华南理工大学 Compact type flue gas waste heat recovery heat exchanger
US20190337072A1 (en) * 2018-05-04 2019-11-07 Hamilton Sundstrand Corporation Method of fabricating heat exchanger with micro tubes and fins

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EP0429166A1 (en) * 1989-11-21 1991-05-29 Bernard Joseph Wallis Method and apparatus for forming heat exchanger tubes
US5186250A (en) * 1990-05-11 1993-02-16 Showa Aluminum Kabushiki Kaisha Tube for heat exchangers and a method for manufacturing the tube

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GB2141362A (en) * 1983-06-14 1984-12-19 Mtu Muenchen Gmbh A method of manufacturing a tube for use in a tubular heat exchanger
EP0429166A1 (en) * 1989-11-21 1991-05-29 Bernard Joseph Wallis Method and apparatus for forming heat exchanger tubes
US5186250A (en) * 1990-05-11 1993-02-16 Showa Aluminum Kabushiki Kaisha Tube for heat exchangers and a method for manufacturing the tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2339399A (en) * 1998-07-10 2000-01-26 Metallifacture Ltd Method of manufacturing a manifold and related improvements
EP1132706A2 (en) * 2000-03-06 2001-09-12 Mitsubishi Heavy Industries, Ltd. Heat exchanger
WO2007010226A1 (en) * 2005-07-22 2007-01-25 Michael Tate Exhaust gas heat exchanger

Also Published As

Publication number Publication date
FR2732101B1 (en) 1998-02-06
ES2136487B1 (en) 2000-11-16
GB9605008D0 (en) 1996-05-08
DE19510283A1 (en) 1996-09-26
FR2732101A1 (en) 1996-09-27
ES2136487A1 (en) 1999-11-16
GB2299037B (en) 1997-10-08

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20090308