DE117992C

DE117992C -

Info

Publication number: DE117992C
Application number: DENDAT117992D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

M 117992 KLASSE 7b. M 117992 CLASS 7b.

Die bisherigen im Gebrauch befindlichen Rippenrohre aus Guiseisen sind sehr theuei und müssen dieselben sehr stark und kräftig sein, wenn solche guiseiserne Rohre bei hohem Drucke Verwendung finden sollen. Versuche, gezogene Rohre aus Schmiedeisen mit einzelnen Scheiben als Rippen zu versehen, haben keine guten Resultate ergeben, da die Scheiben ohne besondere Befestigung auf den Rohren nicht gut haften und die lose aufgesteckten Scheiben auch keine engere Verbindung mit dem Rohr haben.The previous ones in use Finned tubes made of Guiseisen are very expensive, and must be very strong and vigorous if such guise-iron pipes are to be used at high pressures. Try, to provide drawn iron tubes with individual disks as ribs do not give good results because the washers are attached to the tubes without any special fastening do not adhere well and the loosely attached panes do not have a closer connection with either have the pipe.

Es ist nun allbekannt, dais man zum Zwecke der Heizung auch schmiedeiserne Rohre schon mit schmiedeisernen Rippen versehen hat, z. B. im deutschen Patente 7086. Es handelt sich im vorliegenden Verfahren darum, eine fabrikmäfsige Herstellung derartiger. schmiedeiserner Spiralrippenheizrohre auf einem Kernrohr zu schaffen, bei welchem eine genügend innige Verbindung zwischen Kern und Spiralrippen geschaffen wird, so dafs die Rippen thatsächlich zur Verstärkung des Kernrohres gegen inneren Druck dienen können.It is now well known that wrought iron pipes are also used for heating purposes provided with wrought iron ribs, e.g. B. in German patents 7086. It is in the present process, a factory-made production of such. wrought iron To create spiral finned heating tubes on a core tube, in which one is sufficient intimate connection is created between the core and the spiral ribs, so that the ribs actually serve to reinforce the core tube can serve against internal pressure.

Das Verfahren ist ,folgendes:The procedure is as follows:

Es wird ein Bandstreifen a (Fig. 1). entweder völlig hochkant stehend oder in schräger Lage zum Kernrohr c auf das Kernrohr aufgewickelt, und um bei diesem Aufwickeln ein genügend festes Anliegen der Rippen zu erzielen, passirt der Bandstreifen dicht vor dem Kernrohr ein Zieheisen d (Fig. 6), durch welches der bisher gerade Bandstreifen eine Spiralform b (Fig. 3 und 5) erhält, indem der Auisenrand der nachherigen Rippe durch das Zieheisen eine Streckung erfährt (siehe a¹, Fig. 2). Es wird also aus dem geraden Bandeisenstreifen durch das Zieheisen eine Spirale gebildet, und damit dieselbe fest auf dem Kernrohr haftet, mufs diese' gebildete Spirale einen inneren Durchmesser besitzen, der mehr oder weniger kleiner ist als der äufsere Durchmesser des Rohres, weil nur dann ein genügend ■ starkes Aufpressen der Rippe an dem Kernrohr eintritt.It becomes a tape strip a (Fig. 1). either standing on edge or in an inclined position to the core tube c wound onto the core tube, and in order to achieve a sufficiently firm fit of the ribs during this winding, the strip of tape passes a drawing die d (Fig. 6) close to the core tube, through which the previously straight strip of tape is given a spiral shape b (FIGS. 3 and 5), in that the outer edge of the subsequent rib is stretched by the drawing iron (see a ¹ , FIG. 2). A spiral is thus formed from the straight strip of iron by the drawing iron, and so that it adheres firmly to the core tube, this spiral formed must have an inner diameter that is more or less smaller than the outer diameter of the tube, because only then has a sufficiently strong pressing of the rib on the core tube occurs.

Der Durchmesser dieser Spiralrippe kann so weit von dem Durchmesser des Kernrohres differiren, dafs beim Aufwickeln auf das Rohr eine Materialveränderung des Spiralstreifens stattfindet, aber nur eine Materialveränderung am inneren Durchmesser, eine Stauchung, welche naturgemäfs noch die dichte Anlage in vermehrter Weise sichert.The diameter of this spiral rib can be so far from the diameter of the core tube differ, that a change in the material of the spiral strip when it is wound onto the tube takes place, but only a material change on the inner diameter, a compression, which naturally still secures the dense system in an increased manner.

Das Verfahren ist bei diesem Vorgehen demgemäfs folgendes, wie an einem Beispiel erläutert werden soll.The procedure for this procedure is accordingly as follows, as explained using an example shall be.

Es sei ein Kernrohr von 50 mm mit einer. Spirale zu umwickeln, welche 50 mm Steigung hat und eine Höhe von 30 mm. Das Bandeisen habe vor dem Passiren durch die Zieheisen eine Stärke von 3 mm und sei von rechteckigem Querschnitt. Die Zieheisen sind zum Kernrohr gelagert, wie dies die' Fig. 6 der Zeichnung angiebt, und besitzen eine Oeffnung unten von 3 mm und oben von I¹Z₂ mm. Diese Verhältnisse der Zieheisenöffnung sind naturgemäfs abhängig und zu wählen je nach der Streckbarkeit des Materials, und können diese Verhältnisse natürlich nur durch Erfahrung und praktische Ausübung festgestellt werden,Let it be a core tube of 50 mm with a. To wrap a spiral which has a pitch of 50 mm and a height of 30 mm. Before passing through the drawing iron, the band iron was 3 mm thick and had a rectangular cross-section. The drawing dies are mounted to the core tube, as indicated in Fig. 6 of the drawing, and have an opening of 3 mm at the bottom and I ¹ Z ₂ mm at the top. These ratios of the die opening are naturally dependent and to be chosen according to the extensibility of the material, and these ratios can of course only be determined through experience and practical exercise,

Claims

and the dimensions of the material, the dimensions of the core tube and the height of the ribs play an important role. The band iron goes through the drawing iron and a 'spiral' forms, which has an inner diameter of 45 mm and an outer diameter of 105 mm. This spiral must wind up on the 50 mm tube. At the height of the rib, which does not allow such an expansion of the inner diameter from 45 mm to 50 mm, this is only possible by compressing the inner part of the rib, and FIG. 7 of the drawing shows the compressed shape α2 of the finished wound rib. It is clear that this upsetting can under certain circumstances result in heavy stress on the ribbed iron, and in order to avoid this stress, it will be expedient to give the drawing die the shapes shown in FIGS. 8, 8 a and 8 b of the drawing give, in which a lateral deflection of the inner rib when placing on the core tube is possible, whereby the elasticity of the flange e is made more or less useful for the tight contact with the core tube. At the same time, increased heat dissipation is achieved through the flanged flange on the ribs. This allocation can be promoted so far that the flange of the first turn rests against the rib of the second turn, as can be seen in FIG. 9 of the drawing, which enables the most perfect heat transfer from the tube to the ribs. For the method described in this way, instead of drawing iron, rollers can of course be used, which are either set in rotation as drawing rollers through the material passed through, or which, themselves set in motion, to a certain extent roll the band iron through them. The effect, the change in shape, the formation of the spirals through this change in shape is exactly the same for the rollers, whether drawing rollers or rolling rollers, as for the drawing iron. It should now be mentioned that when pulling the band iron through the drawing iron and / or. by means of the rollers the core tube must be given a rotation and a progressive movement. Naturally, the core tube can simply be rotated and the drawing die can be given a progressive movement. Likewise, the third possibility of movement is not excluded, that the drawing iron receives the rotating and advancing movement. As shown in FIG. 4, a further safeguard for the finned tubes on the core tube can be created by first screwing in grooves in the core tube and then using the method described above to create the spirals and price them into the grooves. At the same time, one has the certainty that a certain similar compression of the spiral ribs is achieved, and possibly even the axial movement of the tube can be achieved automatically by these ribs. In all of the modifications described above, it is assumed that a straight strip of tape will remove the dies or the roles passed; Naturally, the spirals can be produced beforehand in a known manner and then applied to the core tube, but the spirals must then also pass through dies or rollers before they are applied to the core tube, which changes the shape of the already pre-formed spirals and turns them into a spiral of smaller diameter than it had before passing the drawing iron. Here, too, of course, this resulting "inner diameter" of the finished spiral must be smaller than the diameter of the core tube, so that a firm fit within the meaning of the invention is achieved. Godfather τ-An Proverbs:

1. A method for the production of finned tubes, characterized in that the dafs Screw ribs from a straight or pre-wound sheet metal strip through the Use of drawing dies or rollers on the core tube · formed and wound onto the same be achieved, whereby a tight fit of the ribs on the core tube

. will.

2. A modification of the method according to claim I, characterized in that the inner diameter of the screw ribs is smaller than the diameter of the core tube, so that when winding on the

'' Core tube by upsetting the inside the tight fit of the screw rib. is promoted.

1 sheet of drawings.