CH485189A - Process for manufacturing oval or elliptical finned tubes and tools for carrying out the process - Google Patents

Process for manufacturing oval or elliptical finned tubes and tools for carrying out the process

Info

Publication number
CH485189A
CH485189A CH1880968A CH1880968A CH485189A CH 485189 A CH485189 A CH 485189A CH 1880968 A CH1880968 A CH 1880968A CH 1880968 A CH1880968 A CH 1880968A CH 485189 A CH485189 A CH 485189A
Authority
CH
Switzerland
Prior art keywords
oval
elliptical
tubes
tube
mandrel
Prior art date
Application number
CH1880968A
Other languages
French (fr)
Inventor
Luca Ioan
Original Assignee
Inst Cercetari Tehnologice Pen
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 Inst Cercetari Tehnologice Pen filed Critical Inst Cercetari Tehnologice Pen
Priority to CH1880968A priority Critical patent/CH485189A/en
Publication of CH485189A publication Critical patent/CH485189A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
    • B21C37/207—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with helical guides
    • 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
    • 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
    • F28F1/36—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 the means being helically wound fins or wire spirals
    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element

Description

Proced@, de iabrication de tubes ovales ou elliptiques ä ailettes et outiliage pour la mise en Oeuvre du procede Process @, for the manufacture of oval or elliptical tubes with fins and tools for implementing the process

La prdsentc itivcntion a pour objct "irr procddd de fabrication d;: tubes ovales ou elliptiques ä ailetteS ä partir de ttrbes lisses, trtilisds dann los cchangeur < de chaleur. The object of this presentation is "irr process for the manufacture of: oval or elliptical finned tubes from smooth tubes, used in the heat exchanger.

Les tubc.s i; ailettes laniindes, ayant la surface intd ricure li;iSe ou pourvtre dune sdrie de rainures ct en #ection trztrsv--r-sttle une forme de base circulaire sont connus, ainsi que Ios avantages tcclini.;tres et oc(#norni .lucs pr-;:sentds par cc:; type., de tubes. The tubc.s i; linear fins, having the inner surface ricure li;iSe or provided with a series of grooves and in #ection trztrsv--r-sttle a basic circular shape are known, as well as Ios tcclini.;tres and oc(#norni .lucs pr-;:sentds by cc:; type., of tubes.

De <B>mc:rne,</B> an connait les tubes ovales ä ailettos appii qudes, ain.si due l'avantage de Icur utilisaticm pour la construction cles dchangcurs de chaleur. From <B>mc:rne,</B> an is familiar with oval tubes with appiied fins, thus due to the advantage of their use for the construction of heat exchangers.

Les tubes :i ailettes lamindes, avec ou sann rainure; intcrietrres qui orit une forme circulaire en section trans versale. ont 1e desavktntage qu'ä 1'assembla ge en fais ceatrx, 1e pas entre detrx tubes proches de la rnhie ran gce est plus < ,rand due celui des tubes ovales, et la cir culation du fluide exterieur rencontre @ttrai une plus Brande resis;ant:e que dann 1e cas des 1116;:s ovales. I_ct tuba ovales ;t ailettes appliquces prcscntent 1e ddsa vantage qu'ils ndcessitcnt beaucoup de travail nianuel lors de leur fabrication tandis que le coefficient de trans fert de chaleur entre les dcux milieux est nioindre que Clans 1e caS des tuhes ä ailettes laminees, ä cause du contact non uniforme des ailettes avec 1e tube de basc, 1e coefficient de transfert de chaleur ddpenda::t aussi dc la qualito du travail appliqud Tors de la rdalisation de Ces tu bes. The tubes: i laminated fins, with or without a groove; interior which orits a circular shape in cross section. have the disadvantage that when assembled, the pitch between two tubes close to the row is greater than that of the oval tubes, and the circulation of the external fluid encounters greater resistance. ;ant:e than in the 1st case of the 1116;:s ovals. The oval tuba and applied fins have the advantage that they require a great deal of manual labor in their manufacture, while the heat transfer coefficient between the two media is less than in the case of laminated fin tubes, because of the non-uniform contact of the fins with the base tube, the heat transfer coefficient also depends on the quality of the work applied when producing these tubes.

Lc but de 1'invention est de pallier Ces inconvdnients. x cet effet, 1e procddc selon 1'invention est caracterisd en ce qtt'on roule les ailettes ä 1'extcrieur du tobe et an roalise simtrltan@nient la cleformation du tobe en forme ovale ou elliptiduc. The object of the invention is to overcome these drawbacks. For this purpose, the method according to the invention is characterized in that the fins are rolled outside the tube and simultaneously produce the formation of the tube into an oval or elliptical shape.

Pluskurs mises en ccuvre du procddd, objet de I'in vention, seront ddcrites, ä titre d'exemple, cri se rofor < tnt au dessin anncxo, auquel Several implementations of the process, object of the invention, will be described, by way of example, cry rofor < tnt to the attached drawing, to which

La fig. I est <B>une vue en coupe</B> partielle du dispositif pour 1e roulage des tubes ovales ä ailettes. fig. I is <B>a partial sectional view</B> of the device for rolling oval finned tubes.

Los fig. 2a et 2b sont des vues en plan de deux man drins interietrrs, trtilises pour exdcuter ]es tubes ovales Ou ellipliques ä surface interieure linse. Los fig. 2a and 2b are plan views of two inner mandrels used to produce oval or elliptical tubes with a smooth inner surface.

Lcs fig. 3a et 3b sont des vues en coupe selon les Iirones ltla-IITa et Ilfb-IITb respectivenient des fig. 2a ct 2h. fig. 3a and 3b are cross-sectional views according to Iirones ltla-IITa and Ilfb-IITb respectively of figs. 2a ct 2h.

Lcs fig. 4a et lb sont des vues en plan de deux mandrins intJrieurs utilises pour la rdalisation des tubes ovales ou elliptiques ä ailettes et rainures intdrieures. fig. 4a and 1b are plan views of two internal mandrels used for making oval or elliptical tubes with internal fins and grooves.

1_cs fitz. 5a et 5b sont des vues en coupe selon les lignes Va-Va et <B>""'1)</B>-V6 respectivernent des fig. -4a et 4b. 1-a fig. 6 est une vue en coupe partielle dun tube ovale 011 elliptiLlue ä StArface interieure linse. 1_cs fitz. 5a and 5b are cross-sectional views along the lines Va-Va and <B>""'1)</B>-V6 respectively of FIGS. -4a and 4b. 1-a fig. 6 is a partial cross-sectional view of an elliptical oval tube 011 with a lined inner face.

Les fig. 7a et 7b sont des vues en coupe de tubes ovales mir ellipti-lues ä stirfaee interieur linse. Figs. 7a and 7b are cross-sectional views of mir elliptical oval tubes with internal stirfae.

La fig. 8 est une vue en coupe partielle d'un tut>: (walc ou ellipti.lue ä Surface interieure rainurde. fig. 8 is a partial sectional view of a tut>: (walc or ellipti.lue ä Grooved interior surface.

Les fig. 9a et 9b sont des vues en coupe de tubes ovales ou elliptiqtres ä rainures intdrieures. Figs. 9a and 9b are cross-sectional views of oval or elliptical tubes with internal grooves.

Les tobe, ovales ou elliptiques reprdsentds peuvent etre rdalises aussi bien ä partir de tubes de forme circu laire que de tubes ovalises initialement, les tubes ayant ies surfaces intdrieures et exterieures lisses et dtant intro duits pour roulage et pour etre formds dann un dispo ;itif oir (in niandrin 1 (fig. 1), fixe ä urie tige 2, est intro dUit ä 1'intdrieur du tobe qu'on fa@onne et, en mime temps que celui-ci entre trois galets profilos 3, montds Sur trois -,txcs q, placds de mani@re dquidistante autour du tube. La position du mandrin 1 est rdglee de Sorte que ]es portions de calibrage du mandrin coincident. Le mandrin I peut tourrier autour de son axe niais est enipechc de se ddplacer axialement, et les trois galets profilos 3, fixes stir leurs axes a, tournent dann 1e meine sens, dtant entrainds par la meme source. Lorsque 1e travail comnience, 1e tobe est poussd entre les trois galets 3 jusqu'à ce que les premières ailettes se soient formées, après quoi le tube avance automatiquement et est entraîné par les galets profilés 3. Pendant que les ailettes se forment,<B>le</B> tube solidement pressé entre les trois galets profilés 3 se déforme en suivant le contour exact du mandrin introduit à l'intérieur et entraîne le mandrin dans un mouvement de rotation. Le tube tourne et se déplace axialement, tandis que le mandrin tourne avec<B>le</B> tube mais est empêché de se déplacer axialement, de sorte que l'intérieur du tube copie exacte ment en mëme temps que la forme ovale ou elliptique du mandrin les rainures existantes sur le mandrin au cas qu'on désire exécuter des tubes ovales ou elliptiques à ailettes avec des rainures intérieures. The tubes, oval or elliptical shown can be made just as well from tubes of circular shape as from initially oval tubes, the tubes having smooth interior and exterior surfaces and being introduced for rolling and to be formed in a device; oir (in niandrin 1 (fig. 1), fixed to a rod 2, is introduced inside the tobe that is fashioned and, at the same time as the latter between three profiled rollers 3, mounted on three -,txcs q, placds mani@re equidistant around the tube.The position of the mandrel 1 is rdglee So that the calibration portions of the mandrel coincide.The mandrel I can rotate around its axis but is prevented from moving axially , and the three profiled rollers 3, fixed on their axes a, rotate in the same direction, being driven by the same source. When the work begins, the tube is pushed between the three rollers 3 until the first fins come together. are formed, after which the tube advances automatically and is driven by the profile rollers 3. While the fins are forming,<B>the</B> tube firmly pressed between the three profile rollers 3 deforms following the exact contour of the chuck introduced inside and drives the chuck in a rotational movement. The tube rotates and moves axially, while the mandrel rotates with <B>the</B> tube but is restrained from moving axially, so that the inside of the tube copies exactly at the same time as the oval shape or elliptical of the mandrel the existing grooves on the mandrel in case you want to make oval or elliptical finned tubes with internal grooves.

L'outillage pour l'exécution des tubes ovales ou elliptiques à ailettes avec ou sans rainures intérieures comprend un mécanisme d'entraînement qui entraîne les galets profilés 3 montés sur les axes 4 et qui tournent dans le même sens à une vitesse constante, et un man drin 1, solidaire d'une tige 2, pouvant tourner librement autour de son axe, mais ne pouvant pas se déplacer axialement, le tube qu'on façonne étant guidé pendant l'opération en utilisant des dispositifs usuels. The tooling for the execution of oval or elliptical finned tubes with or without internal grooves comprises a drive mechanism which drives the profiled rollers 3 mounted on the axes 4 and which rotate in the same direction at a constant speed, and a chuck 1, integral with a rod 2, which can rotate freely about its axis, but which cannot move axially, the tube being shaped being guided during the operation using conventional devices.

La portion active du mandrin est formée par une série de sections ovales ou elliptiques (fig. 2 et 3), sec tions qui croissent progressivement jusqu'à ce qu'elles arrivent à une grandeur maximale qui forme la portion de calibrage, après quoi le mandrin est terminé par un bout chanfreiné ou arrondi. Sur la surface extérieure de la portion active du mandrin, pour les tubes à rainures intérieures (fig. 4 et 5), il y a une série de cannelures longitudinales parallèles à l'axe ou suivant une hélice ayant une petite inclinaison envers l'axe, cannelures dans lesquelles se forment les rainures sur la surface inté rieure des tubes. Dans les fig. 6, 7, S et 9 on présente quelques tubes ovales ou elliptiques à ailettes avec ou sans rainures intérieures. The active portion of the mandrel is formed by a series of oval or elliptical sections (fig. 2 and 3), sections which grow progressively until they reach a maximum size which forms the calibration portion, after which the chuck is terminated with a chamfered or rounded end. On the outer surface of the active portion of the mandrel, for tubes with internal grooves (fig. 4 and 5), there is a series of longitudinal grooves parallel to the axis or following a helix having a small inclination towards the axis , grooves in which the grooves are formed on the inner surface of the tubes. In Figs. 6, 7, S and 9 show some oval or elliptical finned tubes with or without internal grooves.

Claims (2)

REVENDICATIONS I. Procédé de fabrication de tubes ovales ou ellipti ques à ailettes, à partir de tubes lisses de forme circu laire ou ovale, utilisés dans les échangeurs de chaleur, caractérisé en ce qu'on roule les ailettes à l'extérieur du tube, et on réalise simultanément la déformation du tube en forme ovale ou elliptique. Ii. Outillage pour la mise en a:uvre du procédé selon la revendication 1, caractérisé par un mandrin (1) soli daire d'une tige (2) et par les trois galets profilés (3), montés sur des axes (4), placés à distance égale autour du tube. et qui tournent à vitesse constante dans le même sens, le mandrin (1) étant libre de tourner autour de son axe, mais ne pouvant pas être déplacé axialement. SOUS-REVENDICATIONS 1. Procédé selon la revendication 1, caractérisé en ce qu'on forme des rainures intérieures simultanément avec les ailettes. CLAIMS I. Process for manufacturing oval or elliptical finned tubes, from smooth tubes of circular or oval shape, used in heat exchangers, characterized in that the fins are rolled outside the tube, and the tube is simultaneously deformed into an oval or elliptical shape. ii. Tooling for carrying out the process according to claim 1, characterized by a mandrel (1) integral with a rod (2) and by the three profiled rollers (3), mounted on axes (4), placed at equal distance around the tube. and which rotate at constant speed in the same direction, the mandrel (1) being free to rotate around its axis, but not being able to be moved axially. SUB-CLAIMS 1. Process according to claim 1, characterized in that internal grooves are formed simultaneously with the fins. 2. Outillage selon la revendication 11, caractérise: en ce que le mandrin (1) comprend une suite de sections ovales ou elliptiques qui croissent progressivement jus qu'à la plus grande section formant la portion de cali brage.2. Tool according to claim 11, characterized: in that the mandrel (1) comprises a series of oval or elliptical sections which increase progressively up to the largest section forming the calibration portion.
CH1880968A 1968-12-18 1968-12-18 Process for manufacturing oval or elliptical finned tubes and tools for carrying out the process CH485189A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH1880968A CH485189A (en) 1968-12-18 1968-12-18 Process for manufacturing oval or elliptical finned tubes and tools for carrying out the process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1880968A CH485189A (en) 1968-12-18 1968-12-18 Process for manufacturing oval or elliptical finned tubes and tools for carrying out the process

Publications (1)

Publication Number Publication Date
CH485189A true CH485189A (en) 1970-01-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
CH1880968A CH485189A (en) 1968-12-18 1968-12-18 Process for manufacturing oval or elliptical finned tubes and tools for carrying out the process

Country Status (1)

Country Link
CH (1) CH485189A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2171097A1 (en) * 1972-02-07 1973-09-21 Universal Oil Prod Co
FR2532043A1 (en) * 1982-08-23 1984-02-24 Fonderie Soc Gen De Extruded tubular condenser.
FR2647375A1 (en) * 1989-05-18 1990-11-30 Italcoil Spa METHOD AND TOOL FOR MANUFACTURING GROOVED TUBES FOR HEAT EXCHANGERS
CN107214266A (en) * 2017-07-12 2017-09-29 戴明德 The device and method of fin are processed on a kind of thin-walled, small-bore aluminium tube outer surface

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2171097A1 (en) * 1972-02-07 1973-09-21 Universal Oil Prod Co
FR2532043A1 (en) * 1982-08-23 1984-02-24 Fonderie Soc Gen De Extruded tubular condenser.
FR2647375A1 (en) * 1989-05-18 1990-11-30 Italcoil Spa METHOD AND TOOL FOR MANUFACTURING GROOVED TUBES FOR HEAT EXCHANGERS
CN107214266A (en) * 2017-07-12 2017-09-29 戴明德 The device and method of fin are processed on a kind of thin-walled, small-bore aluminium tube outer surface
CN107214266B (en) * 2017-07-12 2018-12-07 戴明德 The device and method of fin are processed on a kind of thin-walled, small-bore aluminium tube outer surface

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