EP0866301A1 - Wärmetauscher und verfahren zu dessen herstellung - Google Patents

Wärmetauscher und verfahren zu dessen herstellung Download PDF

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Publication number
EP0866301A1
EP0866301A1 EP97942272A EP97942272A EP0866301A1 EP 0866301 A1 EP0866301 A1 EP 0866301A1 EP 97942272 A EP97942272 A EP 97942272A EP 97942272 A EP97942272 A EP 97942272A EP 0866301 A1 EP0866301 A1 EP 0866301A1
Authority
EP
European Patent Office
Prior art keywords
tube
heat exchanger
tube elements
fins
beads
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Withdrawn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
EP97942272A
Other languages
English (en)
French (fr)
Other versions
EP0866301A4 (de
Inventor
Soichi Zexel Corporation Kohnan Plant KATO
Shoji Zexel Corporation Kohnan Plant AKIYAMA
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.)
Bosch Corp
Original Assignee
Zexel Corp
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 Zexel Corp filed Critical Zexel Corp
Publication of EP0866301A1 publication Critical patent/EP0866301A1/de
Publication of EP0866301A4 publication Critical patent/EP0866301A4/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Withdrawn legal-status Critical Current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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more conduits
    • 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
    • F28D1/04—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 tubular conduits
    • F28D1/053—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 tubular conduits the conduits being straight
    • F28D1/0535—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 tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05375—Assemblies of conduits connected to common headers, e.g. core type radiators with particular pattern of flow, e.g. change of flow direction

Definitions

  • the invention relates to a heat exchanger, which has tubes stacked in parallel with fins intervened therebetween and to a method for manufacturing the same.
  • a conventionally known stack type heat exchanger has tubes stacked with fins intervened therebetween, ends of the respective tubes connected to distributing and recovering members such as header pipes, and a heat exchange medium meandered a plurality of times to flow between outlet and inlet joints disposed on the distributing and recovering members.
  • the tubes for the stack type heat exchanger have a plurality of passages therein to improve a heat exchange rate and a pressure resistance. Especially, the tubes for a heat exchanger used as a condenser are required to have a remarkable heat exchange rate and pressure resistance.
  • Such a tube proposed is a bead type which divides the inner passage of the tube by circular or oblong beads formed to protrude from a flat portion toward the tube interior, or an inner fin type which has an inner fin having a corrugated cross section inserted into the tube to push the tube so to hold the inner fin between the inner walls of the passage, thereby dividing the inner passage into a plurality of sections as disclosed in, for example, Japanese Utility Model Application Laid-Open Publication No. Hei 5-52565.
  • the bead type tube does not need a separate inner fin and has a small number of components as compared with the inner fin type tube. Therefore, a process for inserting the inner fin and a tube pushing process for holding the inner fin between the inner walls of the passage are omitted, and it is advantageous that the production cost becomes inexpensive. And, it is also possible to enhance a heat exchange rate by causing turbulence in a heat exchange medium flowing through the tube by virtue of the arrangement and shape of the beads.
  • Such tubes are formed by, for example, bending a plate which is made of an aluminum or aluminum alloy material having a thickness of about 0.4 mm or stacking two of the plate, to form a tube having a width of 16 - 20 mm.
  • Fig. 5 is a sectional perspective view of a conventional tube.
  • This tube 13 is formed by bending a single long plate shaped to have a predetermined size along its center in the breadth direction with a predetermined round radius. And, the plate has been formed in advance with a flat bonding section 20 on both edges in the breadth direction of the plate and long grooved beads 21 by rolling or pressing. The plate is also bent along a center bending section 22 so to join the bonding sections 20 mutually to form the tube into a flat shape.
  • Fig. 6 is a sectional perspective view of another conventional tube 13, which is formed by laminating two plates.
  • This tube 13 is formed by forming bonding sections 20 and beads 21 on the two plates and laminating them so to join the bonding sections 20, 20 mutually.
  • tubes are shaped to have a flat form with the breadth direction longer than the thickness direction, and the outer wall interval (a thickness of the tube 13) of the mutually faced flat sections 23, 23 is evenly formed to a predetermined thickness (e.g., about 1.7 mm when its width is 16 to 20 mm) corresponding to a fin and a header pipe.
  • a predetermined thickness e.g., about 1.7 mm when its width is 16 to 20 mm
  • the tubes are stacked with the fin intervened therebetween to pressure-contact the flat section 23 with the fin to keep them in a contacted state or a state that the plates are mutually approached to allow the melted brazing material enter from the surface of the plates during brazing.
  • a jig or the like is used to press the layer of tubes with the fins intervened therebetween from both sides.
  • the beads 21 are formed as illustrated to contact their peaks with the inside of the flat section 23 which is the inner wall of the passage 24 or to contact their peaks with other beads formed on opposed portions.
  • the tubes 13 thus formed are stacked with the fins intervened therebetween and their ends are connected to distributing and recovering members such as the header pipes.
  • an assembly comprising the tubes 13, the distributing and recovering members and the fins is thermally treated and brazed integrally one body.
  • the brazing material is clad at required portions prior to the heating treatment.
  • the plate for forming the tube has a brazing material clad on the front and back faces of the plate in advance.
  • the bonding sections can be brazed relatively well because the melted brazing material also enters between them from the outer faces of the plates. But, the peaks of beads and the inner walls of the passages have the brazing material melted from only the inner walls of the plates between them, so that if their contacts get loose even slightly, the brazing becomes defective noticeably.
  • an object of the present invention is to provide a heat exchanger by applying a pushing force from fins to flat sections to correct appropriately a butt contact between the peaks of beads and the inner walls opposed to the peaks into a brazable state and to reduce a failure of brazing.
  • the invention relates to a heat exchanger having tube elements, which are formed by bending a single plate or by bonding two plates and have beads integrally formed to form a plurality of passages therein, and stacked in parallel with fins intervened therebetween, wherein the tube elements prior to be stacked have a thickness at the intermediate portion larger than that at the intermediate portion of the tube face of the stacked tube elements.
  • the tube element prior to stacking has the intermediate portions of its upper and lower tube faces formed to swell toward the fins, or the tube element prior to stacking has the intermediate portion of one of the tube faces swelled to the fins.
  • the invention also relates to a method for manufacturing a heat exchanger having tube elements, each formed by bending a single plate or by bonding two plates and having beads integrally formed to form a plurality of passages therein, and stacked in parallel with fins interposed between adjacent tubes, comprising the steps of:
  • the swelled portions are appropriately compressed by the forced contact with the fins, and the mutual tops of the tubes or the beads and the inner walls of the tubes are corrected to a brazable state.
  • Fig. 1 is a schematic front view of the heat exchanger according to an embodiment of the invention.
  • Fig. 2 is a partially sectional perspective view showing a tube of this embodiment.
  • Fig. 3 is a partially sectional perspective view showing a temporarily assembled tube of the embodiment.
  • Fig. 4 is a partially sectional perspective view showing a split-plate type tube according to another embodiment of the invention.
  • Fig. 5 is a partially sectional perspective view showing a single-plate type tube according to a conventional art.
  • Fig. 6 is a partially sectional perspective view showing a split-plate type tube according to a conventional art.
  • Fig. 1 shows a front view of the heat exchanger of one embodiment of the invention.
  • the heat exchanger 1 has a plurality of tubes 2, 2 and corrugated fins 3, 3 alternately stacked one another, both ends of the stacked flat tubes 2 inserted and connected to tube insertion ports 5, 5 of header pipes 4 which are erected on both sides.
  • side plate-connecting holes 6 are formed on the header pipes 4 at portions corresponding to the upper and lower sides of the stacked tubes 2, and both ends of side plates 7 having a square C-shaped cross section are inserted and connected to the side plate-connecting holes 6.
  • Top and bottom end openings of the header pipes 4 are sealed by caps 8.
  • An inlet joint 9 is connected to the header pipe 4 on one side, and an outlet joint 10 is connected to the header pipe 4 on the other side.
  • Slits 11 having a predetermined shape are formed on required portions of both header pipes 4, and partition plates 12 are inserted into the slits 11 to divide the header pipes 4 in a longitudinal direction.
  • a heat exchange medium flows to meander a plurality of times between the inlet joint 9 and the outlet joint 10.
  • the heat exchange medium supplied through the inlet joint 9 of the heat exchanger 1 flows to meander a plurality of times between the right and left header pipes 4, 4 through the tubes 2, performing heat exchange with outside while passing through the tubes, and is discharged from the outlet joint 10.
  • the tube 2 is formed by bending a single plate, which has bonding sections 20 and beads 21 formed by rolling, along a center bending part 22 of the plate in its breadth direction. And, flat portions 23 having a predetermined shape which will be described afterward are formed between the bonding sections 20 and the bending part 22.
  • the tube 2 is made of an aluminum brazing sheet material having good heat conductivity, formability and brazing property, and has the bonding sections 20 with the flat portions formed at both ends in its breadth direction to enlarge the bonding areas by virtue of the bonding sections 20, 20, thereby securing a satisfactory bonding strength by brazing.
  • the respective tubes 2 have the beads 21, having a predetermined height, are formed along their length in the longitudinal direction at least prior to be assembled into a single tube 2.
  • the beads 21 are alternately protruded toward the tube interior from the inner face of the tube 2 at predetermined points in the breadth direction of the tube 2, in two lines in this embodiment, to form three passages 24, 24 in the tube 2.
  • the beads 21 are set to protrude to substantially the same height as the inner breadth of the tube 2, and the portions of the tube 2 to oppose the beads 21 are formed flat.
  • the inner faces of the tube 2 are contacted to the peaks of the beads to form a plurality of passages 24, 24 within the tube 2 to improve the heat exchange efficiency of the medium flowing through the passages 24, 24.
  • the sections forming the passages serve as a reinforcing member to improve a pressure resistance against a pressure produced by the heat exchange medium.
  • the flat portions 23 of the tube 2 are formed to swell slightly toward the intervened fins 3 by bending the tube along the bending part 22 and gently protruding both sides along the longitudinal direction with the neighborhood of the center in the breadth direction being the highest.
  • the portions where the beads 21 are formed and the flat portions 23 at the points corresponding to the inner walls of the passages 24 to oppose the peaks of the beads 21 are swelled toward the fins 3.
  • the tube 2 has the fin 3 on its upper and lower faces for stacking, and a pushing force is applied from the fins 3 to the flat portions 23 of the tube 2.
  • this fin 3 is made of a thin metallic material having a good heat conductivity into a corrugated shape to zigzag vertically.
  • the fin 3 is set to zigzag to a height in the same way as the prior art so to reach the non-swelled portions of the tubes to be stacked.
  • the fin 3 is set to have a height as described above and the flat portions 23 of the tube 2 are swelled toward the fin 3, a pushing force is applied from the fin 3 when they are stacked. And, the swelled portions of the flat portions 23 are pushed, namely the tube 2 is compressed to change its vertical thickness from the order of thickness b to the thickness a.
  • the upper and lower flat portions 23 are pushed to deform, and the tube 2 itself is appropriately compressed vertically, so that the upper and lower flat portions 23 are mutually approached to be corrected into a contacted or more closely approached state.
  • the upper and lower portions are at least swelled in the upper and lower directions for the respective beads, the upper and lower flat portions 23 are pushed to deform.
  • the inner wall faces opposed to the beads 21 are approached to the beads and the beads 21 are also approached to the opposed inner wall faces.
  • the fin 3 has its corrugated shape deformed slightly and tightly contacted to the tube 2.
  • the ends of the tube 2 are inserted into the insertion ports 5 of the header pipes 4, the assembly formed is applied with the flux and placed in an oven and brazed into one body by heat treatment.
  • the mutual bonding sections 20, 20 and the peaks of the beads 21 and the flat portions 23 are brazed for bonding by a sufficient amount of the melted brazing material.
  • the beads are alternately protruded from the inner faces of the upper and lower flat portions formed on the tube. But, the beads may be formed on one face only or protruded from the opposed inner faces to contact the peaks of the beads mutually.
  • the flat portions may have only one of the upper and lower faces of the tube swelled or only the required portions in the neighborhood of the beads swelled.
  • this embodiment causes to swell vertically with the neighborhood of the center of the tube as the peak, the swelled portion is appropriately compressed to deform by the pushing force of the fin. And, the mutual bonding sections and the peaks of the beads and the inner walls opposed to the beads can be corrected to have an approached or contacted state optimum for brazing, and the brazing of the pertinent portions can be improved without fail.
  • correction to the approached or contacted state optimum for brazing can be made even if the corresponding sizes of the respective portions, such as the height of the bonding sections and the height of the beads, are deviated to some extent or the mating of the tubes is slightly deviated due to a condition of assembling of the distributing and recovering members and the fins, and the bead peaks are slightly separated from the inner walls of the passages.
  • the beads have a good brazing property, a yield can be improved, and the heat exchange rate and the pressure resistance can be enhanced. Accordingly, the invention can be applied to various types of stack type heat exchangers including a condenser.
  • the tube to be formed of the plate may be a tube 2 which is formed by stacking two plates so to mutually mate the bonding sections 20 as shown in Fig. 4.
  • the invention relates to a heat exchanger having tubes stacked in parallel with fins intervened therebetween and a method for manufacturing it, and particularly improving brazing of tubes having beads for dividing their inside into a plurality of passages. Accordingly, the invention is applied to general radiators, evaporators and also condensers that are required to have a pressure resistance.
EP97942272A 1996-10-08 1997-10-07 Wärmetauscher und verfahren zu dessen herstellung Withdrawn EP0866301A4 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP267287/96 1996-10-08
JP8267287A JPH10111091A (ja) 1996-10-08 1996-10-08 熱交換器
PCT/JP1997/003589 WO1998015794A1 (fr) 1996-10-08 1997-10-07 Echangeur de chaleur et son procede de fabrication

Publications (2)

Publication Number Publication Date
EP0866301A1 true EP0866301A1 (de) 1998-09-23
EP0866301A4 EP0866301A4 (de) 1999-10-06

Family

ID=17442742

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97942272A Withdrawn EP0866301A4 (de) 1996-10-08 1997-10-07 Wärmetauscher und verfahren zu dessen herstellung

Country Status (4)

Country Link
EP (1) EP0866301A4 (de)
JP (1) JPH10111091A (de)
KR (1) KR19990071870A (de)
WO (1) WO1998015794A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1058070A2 (de) 1999-06-04 2000-12-06 Denso Corporation Kältemittelverdampfer
CN102554574A (zh) * 2012-01-18 2012-07-11 金沙 一种板壳式蒸发器板束元件的加工工艺
EP2651549B1 (de) * 2010-12-14 2019-07-31 Fraunhofer Gesellschaft zur Förderung der Angewand Mikrofluidisches bauteil, reaktor aus mehreren solchen bauteilen und verfahren zu deren herstellung

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002130969A (ja) * 2000-10-24 2002-05-09 Japan Climate Systems Corp 熱交換器用チューブ
JP4585682B2 (ja) * 2000-10-24 2010-11-24 株式会社日本クライメイトシステムズ 熱交換器用チューブ
JP4524035B2 (ja) * 2000-12-06 2010-08-11 株式会社日本クライメイトシステムズ 熱交換器用チューブ
JP2002243387A (ja) * 2001-02-21 2002-08-28 Zexel Valeo Climate Control Corp 熱交換器及びその製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2655181A (en) * 1949-09-14 1953-10-13 Mccord Corp Tube construction
US5186251A (en) * 1992-06-01 1993-02-16 General Motors Corporation Roll formed heat exchanger tubing with double row flow passes
DE4340378A1 (de) * 1992-11-27 1994-06-01 Zexel Corp Wärmeaustauscher und Verfahren zur Herstellung derselben
DE4446754A1 (de) * 1994-12-24 1996-06-27 Behr Gmbh & Co Verfahren zur Herstellung eines Wärmetauschers
DE19548495A1 (de) * 1995-12-22 1997-06-26 Valeo Klimatech Gmbh & Co Kg Wärmetauscherblock für Wärmetauscher für Kraftfahrzeuge und Verfahren zu dessen Herstellung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5813993A (ja) * 1981-07-17 1983-01-26 Toyo Radiator Kk 熱交換器におけるコアの組立方法
JPS6166091A (ja) * 1984-09-06 1986-04-04 Toyo Radiator Kk 熱交換器用チユ−ブ材及び該チユ−ブ材による熱交換器コアの製造方法
JPH0552565U (ja) 1991-12-20 1993-07-13 サンデン株式会社 熱交換器
JPH07178542A (ja) * 1993-12-21 1995-07-18 Zexel Corp 熱交換器のろう付け方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2655181A (en) * 1949-09-14 1953-10-13 Mccord Corp Tube construction
US5186251A (en) * 1992-06-01 1993-02-16 General Motors Corporation Roll formed heat exchanger tubing with double row flow passes
DE4340378A1 (de) * 1992-11-27 1994-06-01 Zexel Corp Wärmeaustauscher und Verfahren zur Herstellung derselben
DE4446754A1 (de) * 1994-12-24 1996-06-27 Behr Gmbh & Co Verfahren zur Herstellung eines Wärmetauschers
DE19548495A1 (de) * 1995-12-22 1997-06-26 Valeo Klimatech Gmbh & Co Kg Wärmetauscherblock für Wärmetauscher für Kraftfahrzeuge und Verfahren zu dessen Herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9815794A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1058070A2 (de) 1999-06-04 2000-12-06 Denso Corporation Kältemittelverdampfer
EP2651549B1 (de) * 2010-12-14 2019-07-31 Fraunhofer Gesellschaft zur Förderung der Angewand Mikrofluidisches bauteil, reaktor aus mehreren solchen bauteilen und verfahren zu deren herstellung
CN102554574A (zh) * 2012-01-18 2012-07-11 金沙 一种板壳式蒸发器板束元件的加工工艺

Also Published As

Publication number Publication date
JPH10111091A (ja) 1998-04-28
KR19990071870A (ko) 1999-09-27
WO1998015794A1 (fr) 1998-04-16
EP0866301A4 (de) 1999-10-06

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