FR2479962A2 - Heat exchanger having radial gills with increased tube contact area - obtained by simple double folding of thin metal sheet - Google Patents

Heat exchanger having radial gills with increased tube contact area - obtained by simple double folding of thin metal sheet Download PDF

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Publication number
FR2479962A2
FR2479962A2 FR8007503A FR8007503A FR2479962A2 FR 2479962 A2 FR2479962 A2 FR 2479962A2 FR 8007503 A FR8007503 A FR 8007503A FR 8007503 A FR8007503 A FR 8007503A FR 2479962 A2 FR2479962 A2 FR 2479962A2
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FR
France
Prior art keywords
tube
tubes
hole
heat exchanger
section
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.)
Pending
Application number
FR8007503A
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French (fr)
Inventor
Jean-Louis Moulene
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.)
Valeo SE
Original Assignee
Francaise du Ferodo SA
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 Francaise du Ferodo SA filed Critical Francaise du Ferodo SA
Priority to FR8007503A priority Critical patent/FR2479962A2/en
Publication of FR2479962A2 publication Critical patent/FR2479962A2/en
Pending 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
    • F28F1/24—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 transversely
    • F28F1/32—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 transversely the means having portions engaging further tubular elements
    • 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

Abstract

Parent patent described a heat exchanger, partic. a radiator, of the type comprising a tube with external gills in the form radial flanges, each flange has a zone in contact with the tube which is of greater thickness than the remainder of the flange. This type of heat transfer gill is more efficient than fills of constant thickness, so a lighter wt. heat exchanger can be used for a given duty. In this addn. each flange is made from a single sheet of metal. The sheet is folded itself twice to form a flattened "Z" with its upper and lower branches extending beyond a central zone of triple-sheet thickness. A hole is formed through the central zone to accept the tube which pressed through, the hole periphery gripping tightly on the tube. The hole in the triple-thickness zone can be of a dia. which is smaller than that of the tube, when the tube is pressed through it carries the endge of the hole with it to form a collar on the downstream side which grips the tube firmly. Heat exchangers employing gills with thickened central zone can be made more cheaply than previously. The gill is made from a single sheet of thin metal and requires no supplementary collars or ferrules to provide extra thickness in the tube contact zone. s. 3,4,5.

Description

L'invention concerne un échangeur de chaleur à tubes et ailettes. The invention relates to a tube and fin heat exchanger.

Comme dans le Brevet principal, elle vise spécifiquement un tel échangeur dans lequel les ailettes, au lieu autre d'épaisseur constante sur toute leur étendue, ont des zones plus épaisses que d'autres zones en vue d'adapter au mieux les zones aux diverses fonctions qui sont à remplir. De telles zones sont avantageusement des bandes. As in the main patent, it specifically targets such an exchanger in which the fins, instead of a constant thickness over their entire extent, have thicker zones than other zones in order to best adapt the zones to the various functions to be performed. Advantageously, such zones are strips.

Un échangeur muni de telles ailettes est plus léger qu'un échangeur à ailettes d'épaisseur uniforme tout en ayant au point de vue échange thermique un rendement égal et même supérieur. An exchanger provided with such fins is lighter than a finned exchanger of uniform thickness while having, from the point of view of heat exchange, an equal and even higher efficiency.

La présente invention a pour objet une ailette d'épaisseur non uniforme qui soit d'une fabrication particulièrement simple. The present invention relates to a fin of non-uniform thickness which is of a particularly simple manufacture.

L'invention apporte une solution simple au problème de la fabrication de telles ailettes. The invention provides a simple solution to the problem of manufacturing such fins.

Suivant l'invention, les zones plus épaisses d'une ailette sont obtenues par pliage avec accolement d'une feuille métallique mince suivant deux lignes parallèles de manière à ce que la section transversale des zones plus épaisses ait une configuration en Z aplati. Lès difficultees tenant an laminage sont ainsi écartées ainsi que celles relevant de l'apport de bandes autonomes. According to the invention, the thicker zones of a fin are obtained by folding with a thin metal sheet adjacent to each other along two parallel lines so that the cross section of the thicker zones has a flattened Z configuration. The difficulties related to rolling are thus eliminated as well as those relating to the contribution of autonomous strips.

L'invention concerne donc un procédé de fabrication d'ailettes pour échangeur de chaleur qui consiste à partir d'une feuille mince et à effectuer sur ladite feuille un double pliage de manière à obtenir, en section transversale, un
Z aplati qui constitue une bande dont l'épaisseur est égale au triple de celle de la feuille de départ.The invention therefore relates to a method of manufacturing fins for a heat exchanger which consists in starting from a thin sheet and in performing on said sheet a double folding so as to obtain, in cross section, a
Z flattened which constitutes a strip whose thickness is equal to three times that of the starting sheet.

Dans le cas le plus habituel où il est souhaité faire traverser les tubes sur les bandes épaisses, les trous de passage des tubes sont effectués après le double pliage de la feuille. In the most usual case where it is desired to pass the tubes through the thick strips, the holes for passage of the tubes are made after the sheet is folded twice.

Selon un mode d'exécution, les trous ont sensiblement le diamètre des tubes destinés à être enfilés dans les ailettes. According to one embodiment, the holes have substantially the diameter of the tubes intended to be threaded into the fins.

Selon un autre mode d'esdoution, on pratique des trous d'un diamètre inférieur à celui desdits tubes et un défléchissement sur environ 900 de la zone marginale des trous forme des collets épousant les tubes sur une certaine hauteur, ménageant une aire de contact plus élevée entre un tube et chaque ailette qu'il traverse. According to another mode of welding, holes are made with a diameter smaller than that of said tubes and a deflection over about 900 of the marginal zone of the holes forms collars conforming to the tubes over a certain height, providing a more contact area. high between a tube and each fin it crosses.

Dans la description qui suit, faite à titre d'exemple, on se réfère aux dessins annexés, dans lesquels
- la figure 1 est une vue perspective d'une partie de feuille avant pliage
- la figure 2 est une vue en coupe transversale de ladite partie, mais après un premier pliage
- la figure 3 est une vue analogue à la figure 2, mais après exécution d'un second pliage
- la figure 4 est une vue d'une partie d'ailette en coupe transversale
- la figure 5 est une vue analogue, mais après mise en place d'un tube
- la figure 6 est une vue analogue à la figure 4, mais pour une autre forme de réalisation
la figure 7 est une vue analogue à la figure 5, mais pour cette autre forme de réalisation.In the description which follows, given by way of example, reference is made to the appended drawings, in which
- Figure 1 is a perspective view of a sheet portion before folding
- Figure 2 is a cross-sectional view of said part, but after a first folding
- Figure 3 is a view similar to Figure 2, but after performing a second folding
- Figure 4 is a view of a fin portion in cross section
- Figure 5 is a similar view, but after placement of a tube
- Figure 6 is a view similar to Figure 4, but for another embodiment
Figure 7 is a view similar to Figure 5, but for this other embodiment.

Pour fabriquer une ailette selon l'invention, on part d'une feuille mince 101 (figure 1), en métal, par exemple en aluminium, d'une épaisseur par exemple de 0,04 à 0,06 mm. To manufacture a fin according to the invention, one starts with a thin sheet 101 (FIG. 1), made of metal, for example aluminum, with a thickness for example of 0.04 to 0.06 mm.

ladite feuille est pliée suivant des lignes parallèles aux bords longitudinaux 102, d'abord autour d'une ligne 104 de manière que la face 105 de la partie 103 située d'un côté de la ligne 104 s'applique contre la face 106, que prolongeait initialement la face 105, de la partie 107 située de l'autre côté de la ligne 104 (figure 2). Puis, la partie 108 ainsi sous-jacente à la partie 107 est pliée suivant une ligne 109 (figure 3) également parallèle au bord longitudinal 102, de sortie que la partie 111 située d'un côté de la ligne 109 viSent s'appliquer par sa face 112 contre la face 113 de la partie 108, la feuille ainsi pliée formant une bande 114 dont la largeur est égale à la distance qui sépare les lignes de pliage 109 et 104, à section transversale en forme de Z aplati et dont l'épaisseur est triple de celle de la feuille de départ 101. said sheet is folded along lines parallel to the longitudinal edges 102, first around a line 104 so that the face 105 of the part 103 located on one side of the line 104 is pressed against the face 106, that initially extended the face 105, of the part 107 located on the other side of the line 104 (Figure 2). Then, the part 108 thus underlying the part 107 is folded along a line 109 (FIG. 3) also parallel to the longitudinal edge 102, out of the way that the part 111 located on one side of the line 109 is applied by its face 112 against the face 113 of the part 108, the sheet thus folded forming a strip 114 whose width is equal to the distance between the fold lines 109 and 104, with a cross section in the form of a flattened Z and the thickness is three times that of the starting sheet 101.

C'est dans une ailette ainsi constituée qu'on perce les trous de passage des tubes. It is in a fin thus formed that the holes for passage of the tubes are drilled.

Sur les figures 4 et 5, le trou, qui intéresse les couches successives 115, 116, 117 de la bande 114, a sensible; ment le diamètre extérieur du tube, c'est-à-dire celui de la surface cylindrique 118 du tube 119. Le trou, dont le bord est constitué par les tranches superposées 121, 122, 123, peut également être d'une forme autre que circulaire dans le cas de tube à section transversale non circulaire, par exemple ovale, ou de forme aplatie. In FIGS. 4 and 5, the hole, which concerns the successive layers 115, 116, 117 of the strip 114, is sensitive; ment the outside diameter of the tube, that is to say that of the cylindrical surface 118 of the tube 119. The hole, the edge of which is formed by superimposed edges 121, 122, 123, can also be of another shape than circular in the case of a tube with a non-circular cross section, for example oval, or of flattened shape.

Dans le mode d'exécution selon les figures 6 et 7, on perce un trou d'un diamètre plus petit que celui du tube qui doit traverser l'ailette, obtenant ainsi un trou dont le bord est constitué par les tranches superposées 121, 122, 123, des couches respectivement 115, 116 et 117 et la zone annulaire épaisse de l'ailette est conformée de manière à constituer un rebord ou collet 125 dont la surface interne comprend une partie cylindrique 126 dont le diamètre est précisément celui du tube qui doit tre enfilé dans le trou et qui se raccorde à la face supérieure (dans l'exetple) 124 par une surface incurvée 127. In the embodiment according to Figures 6 and 7, a hole is drilled with a diameter smaller than that of the tube which must pass through the fin, thus obtaining a hole whose edge is formed by the superimposed edges 121, 122 , 123, layers 115, 116 and 117 respectively and the thick annular zone of the fin is shaped so as to constitute a flange or collar 125 whose internal surface comprises a cylindrical part 126 whose diameter is precisely that of the tube which must be threaded into the hole and which is connected to the upper face (in the example) 124 by a curved surface 127.

La surface externe 118 du tube 119 a donc une aire de contact avec l'ailette accrue par rapport à celle de la forme de réalisation précédente. The external surface 118 of the tube 119 therefore has an increased contact area with the fin compared to that of the previous embodiment.

L'expérience a montré quton peut, avec de telles ailettes, améliorer les caractéristiques techniques d'un radiateur. Experience has shown that, with such fins, it can improve the technical characteristics of a radiator.

Par exemple, on obtient un radiateur ayant la même effi cacité d'échange thermique avec un bloc d'ailettes dont le poids est inférieur de 10 à 20 % à celui d1un bloc d'ailettes à épaisseur uniforme. For example, a radiator having the same heat exchange efficiency is obtained with a block of fins, the weight of which is 10 to 20% less than that of a block of fins of uniform thickness.

Ou bien on peut augmenter notablement l'efficacité d'échange thermique d'un radiateur de même dimension, de même nombre de tubes, et de mime nombre d'ailettes avec un poids d'ailettes inférieur à celui d'un radiateur classique ou en tous cas non supérieur.  Or you can significantly increase the heat exchange efficiency of a radiator of the same size, the same number of tubes, and the same number of fins with a weight of fins lower than that of a conventional radiator or all not superior.

Une telle amélioration ~i été constatée, quoique dans une mesure moindre, par l'utilisation d'ailettes dont les différences d'épaisseur résultent d'un laminage ou d'un apport de bandes sur une feuille mince. Such an improvement ~ i has been observed, although to a lesser extent, by the use of fins, the differences in thickness of which result from a rolling or a contribution of strips on a thin sheet.

Claims (9)

REVJXNDICATIONSREVJXNDICATIONS 1. Echangeur de chaleur entre deux fluides, dans lequel un fluide circule dans au moins un tube et l'autre fluide balaie des lames ou ailettes d'un empilage ou jeu traversé par le ou les tube(s), les ailettes présentant en leur(s) zone(s) traversée(s) par le ou les tube(s) une épaisseur plus grande qu'en leurs zones adjacentes, caractérisé en ee que l'épaisseur plus grande est conférée par le pliage avec accolement d'une feuille métallique mince suivant deux lignes parallèles de manière à ce que la section transversale de la zone plus épaisse ait une configuration en Z aplati. 1. Heat exchanger between two fluids, in which one fluid circulates in at least one tube and the other fluid sweeps blades or fins of a stack or clearance crossed by the tube (s), the fins having in their (s) zone (s) crossed by the tube (s) a greater thickness than in their adjacent zones, characterized in that the greater thickness is imparted by bending with a sheet joined thin metal along two parallel lines so that the cross section of the thicker area has a flattened Z configuration. 2. Ailette d'échangeur de chaleur selon la revendication 1, caractérisée en ce qu'elle présente au moins une bande à trois couches à section transversale en Z aplati, dont la barre supérieure et la barre inférieure se prolongent par les parties minces de l'ailette. 2. Heat exchanger fin according to claim 1, characterized in that it has at least one strip with three layers with a flat cross section in Z, the upper bar and the lower bar being extended by the thin parts of the 'fin. 3. ailette selon la revendication 2, caractérisée en ce que la bande à trois couches présente des trous pour le passage des tubes. 3. fin according to claim 2, characterized in that the three-layer strip has holes for the passage of the tubes. 4. Ailette selon la revendication 3, caractérisée en ce que chaque trou a une section sensiblement égale à la section des tubes. 4. Fin according to claim 3, characterized in that each hole has a section substantially equal to the section of the tubes. 5. Ailette selon la revendication 4, caractérisée en ce que chaque trou est du diamètre des tubes. 5. Fin according to claim 4, characterized in that each hole is of the diameter of the tubes. 6. Ailette selon la revendication 3, caractérisée en ce que chaque trou est bordé par un collet par la face interne duquel a lieu le contact avec le tube traversant. 6. Fin according to claim 3, characterized in that each hole is bordered by a collar by the internal face of which takes place the contact with the through tube. 7. Procédé pour la fabrication d'une ailette selon l'une des revendications 2 à 6, caractérisé en ce que, partant d'une feuille mince, on plie celle-ci suivant deux lignes parallèles de manière à former une bande à trois couches à section transversale en Z aplati. 7. Method for the manufacture of a fin according to one of claims 2 to 6, characterized in that, starting from a thin sheet, it is folded along two parallel lines so as to form a strip with three layers with a flattened Z cross section. 8. Procédé selon la revendication 7, caractérisé en ee qu'on perce dans la bande à trois couches des trous ayant la configuration de la section transversale des tubes à enfiler. 8. Method according to claim 7, characterized in ee that is drilled in the three-layer strip of holes having the configuration of the cross section of the tubes to be threaded. 9. Procédé selon la revendication 7, caractérisé en ce qu'on fait des trous ayant la même configuration que celle de la surface transversale des tubes à enfiler, mais plus petite que cette dernière et en ce qu'on défléchit la zone marginale desdits trous pour former des collets dont la-surface interne épouse la surface externe des tubes à enfiler.  9. Method according to claim 7, characterized in that holes are made having the same configuration as that of the transverse surface of the tubes to be threaded, but smaller than the latter and in that one deflects the marginal zone of said holes to form collars whose internal surface matches the external surface of the tubes to be threaded.
FR8007503A 1980-04-02 1980-04-02 Heat exchanger having radial gills with increased tube contact area - obtained by simple double folding of thin metal sheet Pending FR2479962A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8007503A FR2479962A2 (en) 1980-04-02 1980-04-02 Heat exchanger having radial gills with increased tube contact area - obtained by simple double folding of thin metal sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8007503A FR2479962A2 (en) 1980-04-02 1980-04-02 Heat exchanger having radial gills with increased tube contact area - obtained by simple double folding of thin metal sheet

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR403844A (en) * 1909-06-09 1909-11-15 Ch Et G Grimmeisen Soc Radiator for motor cars
US1349011A (en) * 1919-10-28 1920-08-10 Philmore F Spery Radiator for internal-combustion engines
US1523838A (en) * 1922-10-17 1925-01-20 Samuel C Quagliana Radiator core
US3241610A (en) * 1961-10-16 1966-03-22 Peerless Of America Fin and tube stock assemblies for heat exchange units
US3373803A (en) * 1965-06-23 1968-03-19 Slant Fin Corp Heat transfer element
FR1602080A (en) * 1968-12-31 1970-10-05

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR403844A (en) * 1909-06-09 1909-11-15 Ch Et G Grimmeisen Soc Radiator for motor cars
US1349011A (en) * 1919-10-28 1920-08-10 Philmore F Spery Radiator for internal-combustion engines
US1523838A (en) * 1922-10-17 1925-01-20 Samuel C Quagliana Radiator core
US3241610A (en) * 1961-10-16 1966-03-22 Peerless Of America Fin and tube stock assemblies for heat exchange units
US3373803A (en) * 1965-06-23 1968-03-19 Slant Fin Corp Heat transfer element
FR1602080A (en) * 1968-12-31 1970-10-05

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