EP1179719A2 - Verfahren zur Herstellung eines Wärmetauschersrohrs - Google Patents

Verfahren zur Herstellung eines Wärmetauschersrohrs Download PDF

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Publication number
EP1179719A2
EP1179719A2 EP01117658A EP01117658A EP1179719A2 EP 1179719 A2 EP1179719 A2 EP 1179719A2 EP 01117658 A EP01117658 A EP 01117658A EP 01117658 A EP01117658 A EP 01117658A EP 1179719 A2 EP1179719 A2 EP 1179719A2
Authority
EP
European Patent Office
Prior art keywords
strip
dimples
fold line
edges
tube
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Withdrawn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
EP01117658A
Other languages
English (en)
French (fr)
Other versions
EP1179719A3 (de
Inventor
Richard P. Heyse
Jeffrey F. Eggert
Richard A. Fox
Ronald J. Kaat
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.)
Modine Manufacturing Co
Original Assignee
Modine Manufacturing Co
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 Modine Manufacturing Co filed Critical Modine Manufacturing Co
Publication of EP1179719A2 publication Critical patent/EP1179719A2/de
Publication of EP1179719A3 publication Critical patent/EP1179719A3/de
Withdrawn legal-status Critical Current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
    • 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
    • B21C37/15—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
    • 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
    • B21C37/156—Making tubes with wall irregularities
    • B21C37/158—Protrusions, e.g. dimples
    • 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

Definitions

  • This invention relates to heat exchangers, and more particularly, to so-called oval or flattened dimpled tubes employed in such heat exchangers and methods of making the same.
  • dimpled tubes have long been employed in heat exchangers of various types.
  • dimples are formed in the side walls of the tubes to extend partially or wholly across the interior of the tube in a direction across the tube minor dimension.
  • the dimples arc employed for the purpose of inducing turbulence in the heat exchange fluid flowing within the tube to thereby increase the rate of heat transfer.
  • opposed dimples are bonded to one another or dimples are bonded to the opposing side wall of the tube for the purpose of providing pressure resistance to the tubes.
  • tubes of this sort arc made with extremely thin walls and consequently may be incapable of supporting the tube against distortion caused by pressure of the fluid within the tube. This is of particular concern when the tubes are used in higher pressure applications such as in condensers for refrigeration systems, etc.
  • the tubes are flattened, when subjected to pressure, they tend to "go round” unless they are supported against the forces causing such distortion.
  • plate fins are employed on the exterior of the tubes to girdle the tubes and prevent such distortion while in others, inserts are located within the tubes and bonded to opposed side walls for the same purpose.
  • internally directed dimples are brazed to one another or to the opposite side wall of the tube to provide the required strength.
  • Aluminum tubes are easily brazed to other heat exchanger components such as headers and fins.
  • Aluminum tube is formed by placing dimples in a strip used to form the tube while the strip is generally flat or planar.
  • the strip is formed into a generally round shape and the sides of the strip brought together.
  • High frequency induction welding is employed along the edges that are in abutment to weld the strip into a closed tube. Further sizing of the tube from a basically round tube to the conventional flattened or oval cross-section shaped tube then takes place. Dimples formed in the strip while flat are brought into substantial abutment with one another.
  • the strip itself is formed of aluminum base metal and clad with an aluminum based braze alloy on both sides thereof.
  • Brazing flux is introduced into the interior of the tube and when the tube is assembled into a heat exchanger and held in place by a fixture, and subject to a brazing operation, braze alloy material on the interior of the tube flows at the dimples and joins opposed dimples together.
  • brazing flux must be present on the interior of the tube in order to assure that the dimples will braze to one another.
  • Brazing fluxes typically employed in an aluminum brazing operation such as the Nocolok® process leave residues after the brazing process is completed. These flux residues make it difficult to employ the process on tubes having passages of relatively small hydraulic diameter since the passages may become partially or wholly plugged by the flux residue.
  • introducing the flux residue into the interior of the tube can be challenging and the tube interiors may require a subsequent cleaning operation to minimize the accumulation of brazing flux therein.
  • the present invention is directed to overcoming one or more of the above problems.
  • the highly preferred method of making a heat exchanger tube according to the invention includes the steps of:
  • step f) is proceeded by the step of applying a flux to the strip one side at at least the vicinity of the dimples having the slits.
  • the dimples are nominally frusto-conical.
  • perforations other than slits may be used while in others, dimples may be located on only one side of the fold line and brought into contact with the opposite internal side wall of the tube.
  • the method of the present invention is intended to produce aluminum based tubes of so-called flattened or oval cross-section which include internally directed dimples.
  • Tubes of this sort are ideally suited for employment in heat exchangers of various types and particularly those where internally directed dimples are employed for inducing turbulence within the interior of the tube and wherein the tube is required to have some degree of internal resistance to pressure of a heat exchange fluid passing through the tube.
  • the tubes will be useful in the fabrication of vehicular radiators, charge air coolers, heat exchangers used in air conditioning or refrigeration systems, etc.
  • no limitation to use of any of the foregoing listed heat exchangers is intended. It should be sufficient to note that the tubes are ideally suited for use in any heat exchanger application wherein dimples are employed for inducing turbulence and/or for providing pressure resistance.
  • a typical heat exchanger made according to the invention includes opposed, spaced, parallel headers which may be in any known form.
  • the headers 10, 12 may be tubular, formed of one or more pieces.
  • the headers 10 and 12 may be formed of header plates capped with tanks in a conventional fashion.
  • an inlet is schematically indicated at 14 and extends to the header 10.
  • An outlet schematically illustrated at 16 extends from the header 12.
  • the tubes 18 will be of so-called or flattened or oval cross-section and extend through slots (not shown) in facing sides of the headers 10, 12 and brazed in place.
  • Serpentine fins 20 are located between adjacent ones of the tubes 18 and brazed thereto in a conventional fashion. However, it is to be particularly noted that plate fins could be used if desired.
  • All of the components are formed of an aluminum based material so that they may be brazed together in a conventional fashion as, for example, by the so-called Nocolok® process which employs potassium fluoro aluminate compounds as a brazing flux.
  • baffles may be placed in one or the other or both of the headers 10, 12 to provide as many different passes as may be desired.
  • the inlet 14 and the outlet 16 may be located in a single one of the headers 10, 12 rather than in separate headers, depending upon the number of passes provided.
  • tubes 18 are formed of an elongated strip 22 of aluminum based sheet stock.
  • the strip 22 has opposed edges 24, 26 which may be curled upwardly in the same direction through about 90° at each of the edges 24, 26 as illustrated.
  • the fold line 28 is imaginary and represents an area on which the strip 22 will be bent along its length to bring the edges 24 and 26 into contact with one another.
  • the fold line 28 could actually be located on the strip 22 by any suitable marking technique from scoring to the application of ink or the likc.
  • a series of dimples 30 are formed in at least one row that extends longitudinally of the strip 22.
  • the dimples 30 are spaced from one another, nominally frusto-conical in shape, and according to a preferred embodiment, imperforate. They may be formed by any suitable stamping or drawing technique as the strip 22 is passed through forming equipment of a conventional nature employed to form the strip 22 into a completed tube.
  • a second row of spaced dimples 32 is formed between the fold line 28 and the edge 26.
  • the dimples 32 are located so as to align with the dimples 30 when the strip is folded approximately 180° on the fold line 28.
  • the dimples 32 are also generally frusto-conical in shape and their apexes are provided with openings 34.
  • the strip 22 is, as mentioned previously, aluminum based material. On its upper surface 36, bare aluminum is present. That is to say, the upper surface 36 is free of braze alloy, although the same may be oxidized somewhat as is well known.
  • the opposite side of the strip 38 is clad in braze alloy which will typically be an aluminum based compound containing some silicon or other materials which lowers its melting point slightly below the melting point of the base aluminum of which the strip 22 is formed. This allows the braze alloy to become a liquid and flow before the aluminum of the base strip 22 softens and flows.
  • the metallurgy of such a system is well known and will not be described further herein.
  • FIG. 3 A section of completed tube is illustrated in Fig. 3.
  • the edges 24 and 26 have been brought into abutment with one another and bonded to each other as, for example, by high frequency induction welding.
  • the apexes of the dimples 30 and 34 have been brought into contact with one another and, by means to be described in greater detail, bonded to one another.
  • the tubes 18 will typically be substantially longer than that shown in Fig. 3 which represents only a short section of a completed tube 18.
  • Fig. 4 the strip 22 is illustrated with its edges 24, 26 abutted against one another and with a weld 40 formed at the point of abutment to complete a tube. Also seen is the layer 42 of braze alloy on the side 38 of the strip 22. It will be noted that the side 36 is free of braze clad alloy.
  • the apex 44 of one of the dimples 32 has been brought into abutment with the apex 46 of one of the dimples 30.
  • the openings 34 in the apexes 44 thus align with the apexes 46.
  • Fillets 48 of braze material bond the apexes 44, 46 together as well as seal the openings 34.
  • the fillets 48 are formed by braze material from the layer 42 on the side 38 of the strip entering the interior of the tube through the openings 34 to wet the apex 46 of the dimples 30. Upon solidification, the fillets 48 are formed.
  • a strip 42 will be unwound from a coil or the like and run through a stamping or drawing machine to form the dimples 30, 32 as well as the curl at the edges 24 and 26.
  • the strip 22 is bent generally about the fold line and elsewhere to cause the edges 24, 26 to be brought into abutment with one another where they are subject to welding to form the weld 40.
  • the resulting tube will be generally round in shape and may be flattened about the weld 40 and the fold line 46 to assume the configuration generally illustrated in Fig. 3, thereby bringing the dimples 30, 32 into contact with one another.
  • the imperforate dimple 30 may be omitted and the perforated dimples 32 brought into direct contact with the facing interior wall of the tube 18.
  • the welding operation will generally occur before the dimples 30, 32 are abutted but can take place at the same time or afterwards as desired.
  • flux may be applied to the exterior of the tube at least in the vicinity of the dimples 30, 32 and the tube subject to a brazing operation.
  • the braze clad material 42 on the surface 38 of the tube will liquify and, along with the flux, flow through the openings 34 to the interior of the tube and wet the apex 46 of the dimple 30 and ultimately form the fillets 48.
  • the tube is assembled in a fixture along with the headers 10, 12, subject to fluxing and then to brazing temperature to achieve the finished heat exchanger with the dimples 30, 32 bonded to one another.
  • the openings 34 may take on a variety of shapes from circular to oval to other configurations, it is preferred to form them as slits such as the slits shown at 34 in the drawings.
  • slits are substantially easier to form than circular openings such that the forming process need not be slowed down by any need to actually remove material to form the openings 34. That is to say, a slit opening is basically one that penetrates fully through the strip 22 at the apex 44 of the dimples 32 without the removal of any material.
  • the openings 34 may be formed by other than slitting with material actually removed at the apexes 44.
  • the openings 34 thus provide access to the interior of the tube in the vicinity of the apexes 46 on the dimples 30 to allow both the braze alloy from the layer 42 and flux to enter at the precise point where the bonding between dimples 30, 32 is to occur.
  • the strips 22 need be braze clad only on one side rather than on both sides. Consequently, material costs for the tubes is reduced.
  • the resulting tube therefore provides the advantages of known dimpled, flattened tubes while being produceable at a lower cost and avoiding any problems associated with the flux residue.
  • the dimples in the tube provide the desired turbulence and/or pressure resistance for many applications.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP01117658A 2000-08-08 2001-07-25 Verfahren zur Herstellung eines Wärmetauschersrohrs Withdrawn EP1179719A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US63403700A 2000-08-08 2000-08-08
US634037 2000-08-08

Publications (2)

Publication Number Publication Date
EP1179719A2 true EP1179719A2 (de) 2002-02-13
EP1179719A3 EP1179719A3 (de) 2002-03-20

Family

ID=24542180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01117658A Withdrawn EP1179719A3 (de) 2000-08-08 2001-07-25 Verfahren zur Herstellung eines Wärmetauschersrohrs

Country Status (8)

Country Link
EP (1) EP1179719A3 (de)
JP (1) JP2002098492A (de)
KR (1) KR20020013403A (de)
CN (1) CN1337562A (de)
AU (1) AU5591301A (de)
BR (1) BR0103068A (de)
CA (1) CA2354666A1 (de)
MX (1) MXPA01007771A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10242311A1 (de) * 2002-09-12 2004-03-18 Modine Manufacturing Co., Racine Kühlmittelkühler
CN102636050A (zh) * 2012-04-27 2012-08-15 华南理工大学 一种紧凑式烟气余热回收换热装置
US20190226771A1 (en) * 2016-10-07 2019-07-25 Alfa Laval Corporate Ab Heat exchanging plate and heat exchanger
US10816277B2 (en) 2014-07-21 2020-10-27 Hanon Systems Heat exchanger tubes with fluid communication channels

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102636065A (zh) * 2012-04-08 2012-08-15 泰安鼎鑫冷却器有限公司 两侧折叠式组合散热管
CN105021077A (zh) * 2014-05-02 2015-11-04 泰安鼎鑫冷却器有限公司 一种双向连续折叠高强度散热管
KR101540071B1 (ko) * 2015-01-27 2015-07-29 (주)삼원산업사 공조용 응축기 제조 방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59125395A (ja) * 1982-12-29 1984-07-19 Showa Alum Corp 熱交換器用管の製造法
EP0632245A1 (de) * 1993-07-01 1995-01-04 THERMAL-WERKE Wärme-, Kälte-, Klimatechnik GmbH Wasser/Luft-Wärmetauscher aus Aluminium für Kraftfahrzeuge
JPH0719785A (ja) * 1993-06-30 1995-01-20 Toshiba Corp 熱交換パイプおよび熱交換器
EP0694747A2 (de) * 1994-07-25 1996-01-31 Sanden Corporation Wärmetauscher
DE19518657A1 (de) * 1995-04-26 1996-10-31 Lingemann Helmut Gmbh & Co Mehrkammerflachrohr für Wärmetauscher sowie Verfahren zu seiner Herstellung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59125395A (ja) * 1982-12-29 1984-07-19 Showa Alum Corp 熱交換器用管の製造法
JPH0719785A (ja) * 1993-06-30 1995-01-20 Toshiba Corp 熱交換パイプおよび熱交換器
EP0632245A1 (de) * 1993-07-01 1995-01-04 THERMAL-WERKE Wärme-, Kälte-, Klimatechnik GmbH Wasser/Luft-Wärmetauscher aus Aluminium für Kraftfahrzeuge
EP0694747A2 (de) * 1994-07-25 1996-01-31 Sanden Corporation Wärmetauscher
DE19518657A1 (de) * 1995-04-26 1996-10-31 Lingemann Helmut Gmbh & Co Mehrkammerflachrohr für Wärmetauscher sowie Verfahren zu seiner Herstellung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 249 (M-338), 15 November 1984 (1984-11-15) -& JP 59 125395 A (SHIYOUWA ARUMINIUMU KK), 19 July 1984 (1984-07-19) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 04, 31 May 1995 (1995-05-31) -& JP 07 019785 A (TOSHIBA CORP), 20 January 1995 (1995-01-20) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10242311A1 (de) * 2002-09-12 2004-03-18 Modine Manufacturing Co., Racine Kühlmittelkühler
CN102636050A (zh) * 2012-04-27 2012-08-15 华南理工大学 一种紧凑式烟气余热回收换热装置
US10816277B2 (en) 2014-07-21 2020-10-27 Hanon Systems Heat exchanger tubes with fluid communication channels
US20190226771A1 (en) * 2016-10-07 2019-07-25 Alfa Laval Corporate Ab Heat exchanging plate and heat exchanger

Also Published As

Publication number Publication date
JP2002098492A (ja) 2002-04-05
MXPA01007771A (es) 2003-08-20
EP1179719A3 (de) 2002-03-20
BR0103068A (pt) 2002-04-09
KR20020013403A (ko) 2002-02-20
AU5591301A (en) 2002-02-14
CN1337562A (zh) 2002-02-27
CA2354666A1 (en) 2002-02-08

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