EP0005959B2 - Ailettes pour échangeur de chaleur et dispositif pour leur fabrication - Google Patents

Ailettes pour échangeur de chaleur et dispositif pour leur fabrication Download PDF

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Publication number
EP0005959B2
EP0005959B2 EP19790300923 EP79300923A EP0005959B2 EP 0005959 B2 EP0005959 B2 EP 0005959B2 EP 19790300923 EP19790300923 EP 19790300923 EP 79300923 A EP79300923 A EP 79300923A EP 0005959 B2 EP0005959 B2 EP 0005959B2
Authority
EP
European Patent Office
Prior art keywords
strips
heat exchanger
corrugations
displacement
teeth
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.)
Expired
Application number
EP19790300923
Other languages
German (de)
English (en)
Other versions
EP0005959A1 (fr
EP0005959B1 (fr
Inventor
Timothy Anton Turton Cowell
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.)
Armstrong Engineering Ltd
Original Assignee
Armstrong Engineering Ltd
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 Armstrong Engineering Ltd filed Critical Armstrong Engineering Ltd
Publication of EP0005959A1 publication Critical patent/EP0005959A1/fr
Application granted granted Critical
Publication of EP0005959B1 publication Critical patent/EP0005959B1/fr
Publication of EP0005959B2 publication Critical patent/EP0005959B2/fr
Expired 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
    • 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
    • F28F1/34—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 and extending obliquely
    • 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
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/04—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by rolling
    • 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
    • B21D53/022—Making the fins
    • B21D53/025—Louvered 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
    • 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
    • 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
    • F28F1/128—Fins with openings, e.g. louvered fins

Definitions

  • This invention relates to heat exchangers and in particular to secondary surface elements for heat exchangers.
  • Louvred sheet material is already known for use in heat exchangers and the material may take several forms, such as in a fin and tube heat exchanger in which the tubes pass through apertures in a plurality of secondary surface fins.
  • Corrugated sheet material is also used in which such material is located between tubes and louvres are formed in the flanks of the corrugations. In such arrangements the louvres are inclined or twisted relative to the plane of the associated sheet and gaps are formed in the material through which heat exchange medium can pass.
  • French patent specification No. 2 270 544 discloses a heat exchanged material formed with a series of projections of which the flanks lie obliquely to a direction at right angles to the rows of projections.
  • the material is intended to be employed in an oil cooler to provide an annular passage in which a high degree of turbulence is created in the fluid and to achieve this the fluid is passed around the annulus in the direction of the rows of projections.
  • the material is located around a cylindrical passage.
  • a secondary surface element is formed of a plurality of corrugated parallel strips each strip being similarly shaped and corresponding portions of the flanks of the corrugations in adjacent strips being displaced from one another in the longitudinal direction of the strips whereby the leading edge of each flank is displaced in one direction from the trailing edge of the corresponding flank of an immediately adjacent strip, the strips being joined to one another to form a unitary structure.
  • the heat exchanger includes tubes for a heat exchange medium, the lengthwise direction of the tubes lying parallel to the longitudinal direction of the strips in said unitary structure, the tubes being in contact with the crests of the corrugated strips, the arrangement of the tubes and secondary surface element being such as to provide for the flow of fluid over the element in a direction transverse to the longitudinal direction of the strips.
  • the flanks of the corrugations lie at right angles to the longitudinal direction of the strips and hence parallel to the direction of flow of fluid over the element.
  • flanks of the corrugations are each inclined in the opposite direction to said displacement at an acute angle to the longitudinal direction of the strips.
  • Such an arrangement provides large gaps of substantially constant cross section between the strips for the fluid to pass through the element. At the same time a good heat transfer rate is achieved by good contact of the fluid with the element and the provision of a large number of leading edges contacted by the fluid in passing over the element. Accordingly fluid passing through the tubes can give up heat to the fluid passing over the element at a high rate without undue energy loss in eitherfluid.
  • the direction of displacement of the edges of the strips is reversed across the element to provide at least two groups of strips, the displacement of the edges of each group being in opposite directions to one another and the direction of inclination of the flanks of each group being opposite to the direction of displacement of the strips of that group, and the angle of the flanks of the corrugations to the longitudinal direction of the strips is in the range 60°-80°.
  • the displacement between the leading edges and the trailing edges of adjacent strips is such that the corrugations are in alignment in a direction at a right angle to the longitudinal direction of the strips.
  • the displacement between the leading edges and the trailing edges of adjacent strips is of the order of one third the pitch of the corrugations.
  • apparatus for forming a secondary surface element for the heat exchanger of the invention comprises a pair of rolls and drive means for driving at least one of the rolls so that the rolls rotate in opposite directions, each roll being formed of a set of laminae arranged side by side along the axis of the associated roll and each lamina in a set having a corrugated profile with circumferentially spaced teeth, corresponding edges of the teeth of adjacent laminae being angularly displaced from one another about the axis of the associated roll, and the teeth of one set of laminae being arranged in mesh with the teeth of the other set of laminae, characterised by the teeth of the laminae lying on helical paths extending around the associated roll, and the element being formed by feeding sheet material between the rolls.
  • the teeth form the flanks of the corrugations at an acute angle to the longitudinal direction of the strips and the elements are formed simply and effectively.
  • a secondary surface element is shown for use sandwiched between heat exchanger tubes in the manner shown in Fig. 4.
  • the element of Figs. 1, 1A, 2 and 2A is of corrugated form and is made from metal sheet or foil, the corrugations in this case being of truncated triangular form each with flat crests 17.
  • corrugations of other shapes can be formed, for example of generally sinusoidal shape or with relatively wider or narrower flat crests, provided that these are such that the material retains a unitary structure.
  • Each of the strips 11, 12 and 13, is displaced from its adjacent strips by an amount d and the extent of the displacement d may be selected according to pitch P of the corrugations.
  • the height of the secondary surface is given as h.
  • each strip 11, 12 and 13 has a leading and trailing edges, such as at 11a, 12a and 11b, 12b, having regard to a direction of flow A of fluid over the material which direction A is at a right angle to the longitudinal direction of the strips. Adjacent strips are interconnected at the crests 17 to 17a to form an unitary structure.
  • the displacement of adjacent strips from one another can be of any desired amount, ranging from a small displacement d by which the corrugations are aligned with one another in rows lying perpendicular to the longitudinal direction of the strips, to a larger displacement d of the order of a third the pitch P of the corrugations.
  • a complete secondary surface element is shown in which the direction of displacement d of the adjacent strips is reversed centrally of the element.
  • the central strip 3) may be parallel to the general direction of flow A, as shown, or it may be of V-shaped profile, limbs of the V lying parallel to the sets of strips to each side of the strip 30.
  • the element is of symmetrical configuration about the strip 30 and this, together with the inclination of the flanks, enables the material to be readily formed, as will be described.
  • the free edges 11 a, 11 b of the strips can extend the full height h of the material. This compares with louvred material in which the louvres do not extend the full height but are formed along only a portion of the flanks of the corrugations.
  • Fig. 4 the material of Fig. 3, is assembled with tubes 31 so that an element is bounded on each side by a row of tubes 31.
  • the lengthwise direction of the tubes is parallel to the plane of symmetry of the strips.
  • Thee tubes 31 are in contact with the crests of the corrugations.
  • a heat exchange fluid is passed through the tubes 31 and a flow of further fluid, usually air, passes over the element in the general direction of arrows A, transverse to the longitudinal direction of the strips, to set up a heat exchange relationship between the two fluids.
  • Apparatus for forming the corrugated material of Figs. 1-4 is shown in Figs. 5 and 6 of the drawings and it comprises a pair of rolls 20 and 21 mounted on parallel shafts 22 and 23 for rotation in opposite directions, each roll being made up of laminae 24 arranged side by side in contact with one another and each lamina having an outer profile formed with circumferentially-spaced teeth 25. Adjacent laminae in each roll are angularly displaced from one another about the axis of the associated roll by a predetermined amount, as will be explained, and the teeth mesh together on rotation with a suitable space between them to receive the metal sheet or foil to be corrugated.
  • the teeth 25 are helically arranged, that is, each tooth on each lamina lies along a helical path extending around the associated roll. This gives rise to the flanks of the teeth extending at an acute angle to lines parallel to the axis of the associated roll, which angle is the same for all the teeth so that the teeth may mesh with one another. Moreover, the helical paths on which the teeth of each lamina lie are equally spaced from one another circumferentially of the lamina.
  • One way of imagining the constructions of the rolls is to consider a pair of matching helical gear wheels. Divide each gear wheel into a plurality of laminae along lines at right angles to the axes of the wheels and then displace each lamina a small amount angularly in relation to its next adjacent lamina in the opposite direction to the inclination of the flanks of the teeth and in a manner such that the gear wheels can mesh together.
  • helical teeth may be machined in an assembly of generally disc like laminae which are then angularly displaced from one another.
  • corrugated sheet material Upon feeding a sheet of heat-conducting material, for example metal sheet or foil, between these rolls, corrugated sheet material, such as shown in Figs. 1-4 of the drawings, is formed.
  • the teeth 25 of the rolls are shaped to produce the truncated triangular corrugations shown.

Landscapes

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

Claims (7)

1. Echangeur de chaleur comprenant au moins un élément de surface secondaire formé de bandes ondulées parallèles (11, 12, 13) de forme semblable et dont des portions correspondantes des flancs (15) des ondulations de bandes voisines sont décalées d'une bande à l'autre dans la direction longitudinale des bandes, avec décalage (d) en une direction du bord avant (12a) de chaque flanc (15) par rapport au bord arrière (11b) du flanc correspondant d'une bande directement voisine, les bandes (11, 12, 13) étant réunies entre elles en une structure d'un seul tenant, comprenant en outre des tubes (31) pour un fluide d'échange thermique, dont le sens de la longueur est parallèle à la direction longitudinale des bandes dans ladite structure d'un seul tenant, les tubes étant au contact des sommets (17) des bandes ondulées (11, 12, 13), les tubes (31) et l'élément de surface secondaire étant disposés de manière que le fluide (A) s'écoule sur l'élément dans une direction transversale à la direction longitudinale des bandes, caractérisé en ce que chacun des flancs (15) des ondulations est incliné dans la direction opposée à ce décalage sous un angle (a) aigu par rapport à la direction longitudinale des bandes.
2. Echangeur de chaleur selon la revendication 1, caractérisé en ce que la direction de décalage des bords des bandes (11, 12, 13) est inversée sur la largeur de l'élément pour former au moins deux groupes de bandes, le décalage (d) des bords ayant des directions opposées dans les deux groupes et la direction d'inclinaison des flancs (15) de chaque groupe étant opposée à la direction de décalage des bandes du groupe considéré.
3. Echangeur de chaleur selon la revendication 2, caractérisé en ce que l'élément est symétrique par rapport à une bande longitudinale centrale (30).
4. Echangeur de chaleur selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'angle (a) des flancs (15) des ondulations par rapport à la direction longitudinale des bandes est de 60 à 80°.
5. Echangeur de chaleur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le décalage (d) entre les bords avant et les bords arrière de bandes voisines est tel que les ondulations sont alignées suivant une direction faisant un angle droit avec la direction longitudinale des bandes.
6. Echangeur de chaleur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le décalage (d) entre les bords avant (12a) et les bords arrière (12b) de bandes voisines correspond à peu près à un tiers du pas (P) des ondulations.
7. Appareil pour former un élément de surface secondaire d'un échangeur de chaleur selon l'une quelconque des revendications 1 à 6, comprenant une paire de rouleaux (20, 21) et un dispositif de commande pour commander au moins l'un des rouleaux de manière à faire tourner les rouleaux en sens contraire, chaque rouleau étant formé d'un jeu de lames placées côte à côte dans le sens de l'axe (22,23) du rouleau et chaque lame d'un jeu possédant un profil ondulé avec des dents (25) réparties circonférentiellement, des bords correspondants des dents de lames voisines étant mutuellement décalés angulairement autour de l'axe du rouleau et les dents d'un jeu de lames étant disposées en prise avec les dents de l'autre jeu de lames, caractérisé en ce que les dents (25) des lames (24) sont situées sur des trajets hélicoïdaux qui s'étendent autour du rouleau (20, 21) concerné, l'élément étant formé par alimentation de matériau en feuille entre les rouleaux.
EP19790300923 1978-05-31 1979-05-24 Ailettes pour échangeur de chaleur et dispositif pour leur fabrication Expired EP0005959B2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB2533478 1978-05-31
GB2533478 1978-05-31
GB7910746 1979-03-27
GB7910746 1979-03-27

Publications (3)

Publication Number Publication Date
EP0005959A1 EP0005959A1 (fr) 1979-12-12
EP0005959B1 EP0005959B1 (fr) 1982-03-17
EP0005959B2 true EP0005959B2 (fr) 1987-08-26

Family

ID=26257624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790300923 Expired EP0005959B2 (fr) 1978-05-31 1979-05-24 Ailettes pour échangeur de chaleur et dispositif pour leur fabrication

Country Status (2)

Country Link
EP (1) EP0005959B2 (fr)
DE (2) DE7928310U1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU183314B (en) * 1981-02-06 1984-04-28 Laszlo Szuecs Ribbed heat exchanger and method for producing same
US4860822A (en) * 1987-12-02 1989-08-29 Carrier Corporation Lanced sine-wave heat exchanger
CA1316528C (fr) * 1988-01-11 1993-04-20 Paul H. Ballentine Ailettes en plaque a performances thermiques ameliorees
FR2651568A1 (fr) * 1989-09-07 1991-03-08 Galmes Alain Echangeur a ailettes perfectionne.
JP4207331B2 (ja) * 1999-09-29 2009-01-14 株式会社デンソー 複式熱交換器
US10094624B2 (en) * 2016-01-08 2018-10-09 Hanon Systems Fin for heat exchanger
JP6546681B1 (ja) * 2018-05-16 2019-07-17 モリテックスチール株式会社 メタル箔及びこれを備えた積層体

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE410189A (fr) *
NL1056C (nl) * 1911-11-22 1916-02-01 Beran Albert Universeelwalsen voor het vervaardigen van gegolfd karton, gegolfd plaatijzer en dergelijke
US1416570A (en) * 1918-01-22 1922-05-16 Arthur B Modine Radiator core
CH220298A (de) * 1938-10-22 1942-03-31 Beck Stefan Wärmeaustauschvorrichtung.
CH219262A (de) * 1939-08-28 1942-01-31 Ungarische Radiatoren Fabriks Lamellen-Wärmeaustauschvorrichtung.
DE1132163B (de) * 1953-07-04 1962-06-28 Buderus Eisenwerk Waermeaustauscher mit in parallelen Reihen angeordneten flachen und in Stroemungs-richtung des Waermeaustauschmediums kurzen Waermeaustauschkoerpern
US3083662A (en) * 1957-07-19 1963-04-02 Borg Warner Heat exchanger and method of making same
US3433044A (en) * 1963-02-19 1969-03-18 Ford Motor Co Method for forming heat exchange element
US3265127A (en) * 1963-10-21 1966-08-09 Ford Motor Co Heat exchange element
US3796258A (en) * 1972-10-02 1974-03-12 Dunham Bush Inc High capacity finned tube heat exchanger
GB1485369A (en) * 1973-12-05 1977-09-08 Covrad Ltd Apparatus for shaping sheet material
JPS5638874B2 (fr) * 1974-05-10 1981-09-09
US3993125A (en) * 1975-11-28 1976-11-23 Ford Motor Company Heat exchange device
GB1601952A (en) * 1977-02-17 1981-11-04 Covrad Ltd Apparatus for making corrugated sheet material

Also Published As

Publication number Publication date
EP0005959A1 (fr) 1979-12-12
DE2962272D1 (en) 1982-04-15
EP0005959B1 (fr) 1982-03-17
DE7928310U1 (de) 1980-01-31

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