WO2004003453A2 - Reseau d'ailettes pour dispositifs de transfert thermique et procede de fabrication associe - Google Patents

Reseau d'ailettes pour dispositifs de transfert thermique et procede de fabrication associe Download PDF

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Publication number
WO2004003453A2
WO2004003453A2 PCT/US2003/020653 US0320653W WO2004003453A2 WO 2004003453 A2 WO2004003453 A2 WO 2004003453A2 US 0320653 W US0320653 W US 0320653W WO 2004003453 A2 WO2004003453 A2 WO 2004003453A2
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WO
WIPO (PCT)
Prior art keywords
fin
bend
segments
array
axes
Prior art date
Application number
PCT/US2003/020653
Other languages
English (en)
Other versions
WO2004003453A3 (fr
Inventor
Roger Paulman
Original Assignee
Roger Paulman
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 Roger Paulman filed Critical Roger Paulman
Priority to AU2003247855A priority Critical patent/AU2003247855A1/en
Publication of WO2004003453A2 publication Critical patent/WO2004003453A2/fr
Publication of WO2004003453A3 publication Critical patent/WO2004003453A3/fr
Priority to US11/020,562 priority patent/US20050167088A1/en

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
    • 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

Definitions

  • the present invention relates generally to the field of heat exchanger assemblies. More specifically, the present invention relates to an improved design and method of manufacturing a fin array for use in a heat transfer assembly.
  • Fin arrays have been previously produced using a louvered design.
  • the louvered fin array is folded in a serpentine pattern to form a series of alternating rounded upper and lower crests with a plurality of individual fins.
  • Each of the individual fins may include a plurality of louvers.
  • This fin array is manufactured from strips of metal, such as copper or aluminum, that are driven through rotary cutting dies that cut the openings in the strip and shape the louvers by pushing them inward or outward from the strip.
  • the fins are then folded using a "star wheel” style roller which imparts rounded bends to the fin stock. This approach has certain disadvantages.
  • the louvered fin arrays do not provide the maximum heat flux between the fins and the ambient air as a consequence of air by-pass in the rounded fin areas.
  • the angled louver designs create unwanted pressure drop differentials through the coil assembly.
  • these fin arrays can be expensive to manufacture as a consequence of the high tooling costs associated with shear cutting of the fin material.
  • louvered design Alternative approaches to the louvered design have been proposed in order to overcome some of the problems previously encountered.
  • the fin array includes top and bottom portions connected together by fins extending between adjacent ones of the top and bottom portions.
  • the fins have side edges facing generally perpendicular to the longitudinal length of the one-piece fin member.
  • the side edges of the completed fins are also offset with respect to each other in order to improve heat flux with the passing air. While this serpentine fin array design improved heat transfer capabilities, it has other disadvantages associated with its manufacture.
  • the one-piece serpentine design can be manufactured by scoring fin stock using a crush cut method (chisel and anvil). After the fin stock is scored or cut, it is driven through a pair of star wheels. The star wheels bend the fin stock so that the top portion extends in a common top plane, the bottom portion extends in a common bottom plane, and the fin stock extends between and connects adjacent ones at the top and bottom portions. Because the fin stock is uncompressed, it is placed in a compression device that urges the ends together in order to complete manufacture of the fin array. This manufacturing approach has been problematic. For example, the machinery, such as the star wheels, can be very slow moving, and complicated.
  • a fin array having a plurality of fins.
  • the fin array is an elongated one piece element.
  • the fins include connected staggered top segments and bottom segments.
  • a top bend axis extends continuously across a plurality of the top segments.
  • a fin array is provided having a plurality of fins.
  • the fin is an elongated one piece element.
  • the fins include a plurality of connected staggered top segments and bottom segments.
  • Upper and lower bend axes extend continuously through a plurality of the top segments and bottom segments, respectively.
  • a plurality of staggered fin bend axes extend on both sides of the top bend axis and the bottom bend axis.
  • a method of forming a fin array includes the step of providing a sheet of fin stock.
  • the method also includes the step of positioning and passing the fin stock through a cutting roller which produces a one-piece fin member including a plurality of fins.
  • the fins include connected staggered top segments and bottom segments.
  • the one piece fin member has top and bottom bend axes extending continuously through the top and bottom segments.
  • the one piece fin member also includes staggered fin bend axes on both sides of the top and bottom bend axes.
  • the method also includes the step of bending the fin stock along the top and bottom bend axes such that the top and bottom segments form a generally flat surface.
  • Figure 1 is a perspective view of a folded fin array in accordance with an embodiment of the present invention
  • Figure 2 is a schematic view of an embodiment of the folding process of the fin stock that ultimately forms the fin array shown in Figure 1 ;
  • Figure 3 is a top plan view illustrating fin stock after having been passed through cutting rollers;
  • Figure 4 is an enlarged view of forming wheels and fin stock passing outward therefrom;
  • Figures 5A-H are side views and enlarged portions of the star wheels that form a portion of the forming wheels;
  • Figure 6 is a perspective view of the fin array after having passed through the forming wheels.
  • the present invention is directed to an improved fin array and heat transfer assembly and method of making same. It will be understood by those of ordinary skill in the art that the fin array of the present invention can be used with a wide variety of heat exchanger assemblies and in various applications. For example, a fin array of the present invention could be used in air conditioning condenser coils or automotive radiators
  • Fig. 1 illustrates a fin array 10 in accordance with a first embodiment of the present invention.
  • the fin array 10 has a generally serpentine pattern and is preferably formed from a single piece of fin stock. Materials such as aluminum, particularly rolled aluminum fin stock, or copper or other known materials may be used to form the fin array 10.
  • the fin array 10 includes a plurality of fin sets 14 formed from fins 18.
  • the fin sets 14 include top and bottom portions 22, 24.
  • the top portions 22 extend in a common flat top plane and bottom portions 24 extend in a common flat bottom plane.
  • the top and bottom portions 22, 24 maximize surface contact area with an associated heat exchanger tube thereby maximizing heat transfer between the fins 18 and the associated heat exchanger tube.
  • each fin 18 runs continuously from tube to tube surface giving enhanced heat transfer close to the tubes where the temperature differential between fins 18 and air is greatest.
  • the top and bottom portions 22, 24 are elongated flat sections that extend generally perpendicular to the running length of the fin array 10.
  • the top and bottom portions 22, 24 form a plurality of top and bottom staggered segments 28, 29 generally having a staggered rectangle shape.
  • the fin array 10 includes four complete and one imcomplete fin sets 14.
  • the fin sets 14 include seventeen fins 18 in the illustrated embodiment. It should again be recognized by those of ordinary skill in the art that more or less than four fin sets 14 may be implemented and that more or less than seventeen fins 18 may be implemented.
  • a single fin 18 might be as wide as the fin strip itself or as narrow as 0.002 inches. Fin strips can be of any width but are typically in the range of 0.5 inches to 6.0 inches in width.
  • the number of fins 18 in each fin set 14 (or repeated pattern) is defined by the fin pitch (the spacing of fins in the completed folded fin) and the fin offset (the staggered spacing of fins across the fin).
  • the number of fins 18 in a fin set 14 will be not greater than the fin pitch divided by the fin offset.
  • Fin pitch may vary from as little as 0.020 inches to as much as 0.500 inches.
  • Fin offset may vary from as little as 0.010 inches to as much as 0.500 inches depending on the application.
  • Fin height may also vary greatly from as little as 0.100 to as much as 6.0 inches typically.
  • Each of the fins 18 includes top and bottom edges 30A, 30B.
  • the top and bottom edges 30A, 30B define sides 32A, 32B.
  • the sides 32A, 32B interconnect the top and bottom portions 22, 24.
  • the fins 18 are offset from one another to provide a gap 38 that maximizes the heat transfer of the fins 18 by allowing ambient air ready access to fins 18.
  • the sides 32A, 32B extend perpendicular to the longitudinal or abyssal length of the fin array 10 in order to further maximize air flow.
  • the fin array 10 includes a top or ordinential bend axis 40 axis that extends across the top segments 28. In the illustrated embodiment, the top bend axis 40 extends continuously along the top portion 22.
  • the bottom or ordinential bend axis 44 extends along the bottom portion 24 or bottom segments 29.
  • the bottom bend axes 44 extend continuously along the bottom portion 24.
  • continuous is not intended to suggest that the associated cutting of the fin stock has to be “continuous.” Indeed it cannot be continuous or the fin would fall apart during assembly operations. Rather, the cuts are sufficient to cause the material to bend easily and in precise alignment yet remain attached while the bend axes extend continuously through the material forming the top and bottom portions 22, 24.
  • Fig. 2 is schematic view of an embodiment of the manufacturing method of the present invention 60.
  • the manufacturing process includes using a conventional rotary cutting device (not shown) to cut or score the fin stock 62 into the pattern as best shown in Fig. 3.
  • the cut fin stock 62 is passed into the folding rollers 68 which fold the cut fin stock 62 into the folded fin pattern 70 best illustrated at Fig. 6.
  • the folded fin pattern 70 is passed into a conventional compression device 72 that compresses the ends of the folded fin stock pattern 70 into the fin array 10 illustrated in Fig. 1.
  • the cut fin stock 62 is best illustrated in Fig. 3.
  • the cutting rollers cut the fin stock into the pattern illustrated in Fig. 3 using a conventional crush cut (chisel and anvil) technique. It should be recognized that the cuts forming the bend axes 40, 44 are longer than the cuts used to form the fins 18 thereby resulting in an inherently greater weakness in the bending of these areas.
  • Two pinch rollers are provided to assist by flattening out the cut fin stock after each cutting step.
  • U.S. Patent No. 6,247,527 issued on June 19, 2001 to Roger Paulman, for a further description of the cutting process and other related manufacturing steps, the disclosure of which is hereby incorporated by reference.
  • the cut fin stock 62 may be implemented so as to produce the cut fin stock 62.
  • the folding rollers 68 serve to separate the fins 18 and fold the fin pattern 70 along the bend axes 40, 44.
  • the folding rollers mechanically force apart the fins 18 of the fin sets 14 and bend each fin set at the bend axes 40, 44 as illustrated in Fig. 6. Because the bend axes 40, 44 extend across the top and bottom portions 22, 24 of each fin set 14, the fin stock material is weakened substantially in order to provide for easy bending and re-flattening along the associated bend axes.
  • the folding rollers 68 include a plurality of sets of star wheels 90, 92, 94, 96.
  • the star wheels 90-96 are formed in sets of four wheels 90-96 with four sets shown to form each folding roller in illustrated embodiment.
  • the star wheels 90, 92, 94, 96 are best illustrated in Figs. 5A-H.
  • Each star wheel 90, 92, 94, 96 includes associated teeth 90A, 92A, 94A, 96A.
  • the teeth 90A, 92A, 94A, 96A are best illustrated in the enlarged views of Figs. 5B, 5D, 5F, 5H.
  • Each of the teeth 90A, 92A, 94A, 96A is sized differently to produce the offset pattern of teeth as best seen in Fig. 4.
  • the teeth 90A-96A produce the fins 18 by pressing into the cut fin stock 62.
  • the top portions 90B- 96B and bottom portions 90C-96C are used to bend the fin sets 14 along the bend axes 40, 44.
  • the folded fin pattern 70 is produced.
  • the folded fin pattern 70 includes a plurality of fin sets 14 with individual fins 18 formed and partially bent along the bend axes 40, 44.
  • a conventional compression device 72 compresses the edges of the folded fin pattern 70 in order to produce the fin array 10 illustrated in Fig. 1. Because the cuts associated with the bending axis 40 extend across each fin set 14, the material is weaker in these areas thereby allowing for the folded fin pattern 70 to be readily bent to produce fin array 10.
  • the folded fin pattern 70 is produced by urging it into a box against a backwards force. More specifically, the present invention overcomes previous problems by positively folding (using opposing wheels) two approximately 90 degree bends (the bottom bend axes 44) along with an approximately third 90 degree bend (the bending axis) which is subsequently flattened back to the straight or nearly straight condition in the box.
  • This third bend is made such that the fin material holding the fin together at the bend is much narrower than that of the other bends which are expected to remain at about 90 degrees in the final formed fin array.
  • the third bend will re-flatten itself back to near flat condition without changing the two 90 degree bends on either side of it thus resulting in a near perfect "square" final fin configuration.

Landscapes

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

Abstract

L'invention concerne un réseau d'ailettes pour échangeur thermique et un procédé de fabrication associé. Ce réseau d'ailettes constitue un élément en une pièce allongé comportant une pluralité d'ailettes. Ces ailettes comprennent des segments supérieurs et inférieurs décalés connectés. Un axe de courbure supérieur s'étend en continu à travers une pluralité des segments supérieurs.
PCT/US2003/020653 2002-06-28 2003-06-30 Reseau d'ailettes pour dispositifs de transfert thermique et procede de fabrication associe WO2004003453A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003247855A AU2003247855A1 (en) 2002-06-28 2003-06-30 Fin array for heat transfer assemblies and method of making same
US11/020,562 US20050167088A1 (en) 2002-06-28 2004-12-22 Fin array for heat transfer assemblies and method of making same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39207502P 2002-06-28 2002-06-28
US60/392,073 2002-06-28

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/020,562 Continuation US20050167088A1 (en) 2002-06-28 2004-12-22 Fin array for heat transfer assemblies and method of making same

Publications (2)

Publication Number Publication Date
WO2004003453A2 true WO2004003453A2 (fr) 2004-01-08
WO2004003453A3 WO2004003453A3 (fr) 2004-04-01

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PCT/US2003/020653 WO2004003453A2 (fr) 2002-06-28 2003-06-30 Reseau d'ailettes pour dispositifs de transfert thermique et procede de fabrication associe

Country Status (3)

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US (1) US20050167088A1 (fr)
AU (1) AU2003247855A1 (fr)
WO (1) WO2004003453A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160313070A1 (en) * 2014-02-10 2016-10-27 Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd. Heat-exchanger offset fin and refrigerant heat-exchanger utilizing same

Families Citing this family (9)

* Cited by examiner, † Cited by third party
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DE102004012796A1 (de) * 2003-03-19 2004-11-11 Denso Corp., Kariya Wärmetauscher und Wärmeübertragungselement mit symmetrischen Winkelabschnitten
US20060090873A1 (en) * 2004-11-01 2006-05-04 Egbon Electronics Ltd. Method for manufacturing heat sink devices
US8004421B2 (en) 2006-05-10 2011-08-23 Schlumberger Technology Corporation Wellbore telemetry and noise cancellation systems and method for the same
JP4876975B2 (ja) * 2007-03-02 2012-02-15 株式会社日立製作所 電子機器用の冷却装置および受熱部材
US9579702B2 (en) * 2013-01-28 2017-02-28 Arvos Inc. Roller for forming heat transfer elements of heat exchangers
CN104089517B (zh) * 2014-07-18 2016-08-17 丹佛斯微通道换热器（嘉兴）有限公司 用于换热器的翅片和具有该翅片的换热器
DE102015111571A1 (de) * 2015-07-16 2017-01-19 Dbk David + Baader Gmbh Verfahren zum Herstellen eines Wellrippenelementes, Wellrippenelement und Heizregister
FR3106001B1 (fr) * 2020-01-03 2022-12-02 Valeo Systemes Thermiques Échangeur de chaleur à tubes comportant des intercalaires
DE102020109118B3 (de) * 2020-04-01 2021-03-25 Matrix Module Gmbh Abstandsstruktur, Sandwich-Konstruktion mit einer solchen Abstandsstruktur und Verfahren zur Herstellung einer solchen Abstandsstruktur

Citations (5)

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Publication number Priority date Publication date Assignee Title
US2647731A (en) * 1951-08-17 1953-08-04 Arvin Ind Inc Radiator core construction
US3998600A (en) * 1975-06-16 1976-12-21 Wallis Bernard J Heat exchanger strip and method and apparatus for forming same
US5679106A (en) * 1994-12-26 1997-10-21 Nippondenso Co., Ltd. Roller for forming corrugated fin
US5816320A (en) * 1997-01-10 1998-10-06 J.I.T. Engineering, Inc. Radiator fin construction
US6247527B1 (en) * 2000-04-18 2001-06-19 Peerless Of America, Inc. Fin array for heat transfer assemblies and method of making same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6481259B1 (en) * 2000-08-17 2002-11-19 Castle, Inc. Method for precision bending of a sheet of material and slit sheet therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2647731A (en) * 1951-08-17 1953-08-04 Arvin Ind Inc Radiator core construction
US3998600A (en) * 1975-06-16 1976-12-21 Wallis Bernard J Heat exchanger strip and method and apparatus for forming same
US5679106A (en) * 1994-12-26 1997-10-21 Nippondenso Co., Ltd. Roller for forming corrugated fin
US5816320A (en) * 1997-01-10 1998-10-06 J.I.T. Engineering, Inc. Radiator fin construction
US6247527B1 (en) * 2000-04-18 2001-06-19 Peerless Of America, Inc. Fin array for heat transfer assemblies and method of making same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160313070A1 (en) * 2014-02-10 2016-10-27 Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd. Heat-exchanger offset fin and refrigerant heat-exchanger utilizing same

Also Published As

Publication number Publication date
AU2003247855A1 (en) 2004-01-19
AU2003247855A8 (en) 2004-01-19
WO2004003453A3 (fr) 2004-04-01
US20050167088A1 (en) 2005-08-04

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