DE1730134U - CROSS FIBER TUBE. - Google Patents

Description

& 2S3 € 68-215.5B

File number 12853 / TbGm

Ssslingen, May 19, 1956

Dr, -Ing. Günter Scholl
E ss 1 i age η. / H.
Mülbergerstrasse 21 / A

Finned tube with square, along the diagonals of the square in greed! in which two opposing hip sections are simultaneously connected to the Bohr by electrical resistance welding.

The hiring relates to a ribbed pipe with square ribs arranged transversely to the pipe axis, with Bohr and Clans are made of steel and welded to one another are connected * With such ribbed pipes used for heat exchange, a particularly good, heat-conducting, metallic connection between ribs and Pipe required, equilateral is a simple and thus M lie Herat al lung der Hipp θζιγ öhre sor.

According to the renewal, this is achieved in that the square ribs are divided into four sections along the diagonal of the square and two opposing sections are connected to the drill by electrical resistance welding, with the welding of the rib sections by an automatic welding machine with automatic feed the rib sections from storage cassettes to the electrodes, with mechanical clamping of the rib sections on the electrodes, with controlled electrode feed, contact pressure, welding current and upsetting pressure and with automatic sliding of the pipe, according to the desired fin division.

ELatt 2

The innovation is explained in more detail with the aid of the drawings:

1 shows the section through a finned tube with square ribs with rounded corners arranged transversely to the tube axis. In the drawing, the course of the isotherms is shown by dashed lines, as it results when the Eohr E is in an aligned arrangement in a bundle with other, similar bores and from a gas stream flowing in the plane of the drawing from top to bottom or from below upwards the pipes are flushed, heated. Ifach ELg. 1, the hip is divided into four pieces of rope Q *, C ₂ > T ~ ₉ and ¹ S λ , whereby, according to the innovation, the adjacent edges run approximately perpendicular to the isotherms drawn, roughly in the direction of the diagonals of the square family.

With regard to the heat flow in the divided rib, there is no change compared to a rib consisting of one piece, since the heat flow is perpendicular to the isotherms and thus parallel to the edges of the rib sections. So there can easily be larger or smaller lift gaps between the edges of the parts, as shown in SIg, !, Without these having a harmful effect on the heat dissipation from the hip to the drill.

FIG. 2 shows a section through the finned tube according to FIG. 1 along the line a - a. Here, the rib sections £ « T ³³³ U ^ a are already connected to the tube R by resistance welding, while the parts 2g u ²¹ ^ ^ 4 are shown in a position shortly before the welding current is switched on.

In Hg. 3 an excerpt from the manufacture of finned tubes after firing is shown. The two diametrically opposed rib sections 2. and T.,. are pressed against the pipe R by the electrodes E _{1 and E ~.} Hg. 3 represents the point in time shortly before switching on the welding current ", the 3.3. Coming through from the electrode 1, the

Sheet 3 ,

Rib section S ₁ over the Eohr E and through the rib section T ~ to the electrode E ^ fHessen.

Because the whole rib is divided into at least animal parts according to the innovation, there is automatically a wedge-shaped decrease in cross-section towards the welding point for the individual parts punched out of sheet metal, so that the electrodes E ₁ and E ₂ supplied © Sirrom experiences an increasing current density towards the welding point.

By continuing to use the four parts each nttr two diametrically opposite at the same time with welded to the ear are the closest Establish the current transfer between the hip sections

a quarter of the entire

fanges away from each other and therefore in front of impermissibly higher Heating (burn-off) protected. You two aforementioned Objects of fire together cause one over ~ the ~ entire contact surface (welding zone) between slugs and Sohr extending, uniformly good welded joint with high thermal conductivity · Aus? ig. 3 is also you can see that the hadius of the sweat kaiites of the hip cuts is slightly smaller than the ■ outer radius of the pipe, So that the Eippent parts pieces when they are pressed "the pipe first touch the outermost tips of the contact image end.

With this design of the welded edges, two equally large and spatially symmetrical parts are created for each rib section formed initial contact zones lying to the ear axis, the during the short-term, high-current dieife Welding processes a, under the contact pressure of the electrodes to a single, molten contact - and Unite welding zone.

Fig. 4 and 5 is a schematic representation of the construction an automatic welding machine for carrying out the method according to shown the fire. This is an ¥ or-

// Sheet

direction for the production of kinspipes with square, Hips arranged transversely to the pipe axis, as shown in Hg. 1,2 and

FIG. 4 shows a section through the automatic welding machine along the line e - e in J & g * 5.

. 5 gives a section along the line d - d, the .Fig. 4th again*

From, the electrodes E,. ,, &> ν E * and E ^ are the electrodes E. and B, in the welding position _r the electrodes E ₂ and E. when picking up new parts I ₂ and Ta from the storage _{cassettes S 2} and St shown you, "said reproduced in the drawings position: next move is indicated by arrows drawn. Hack the welding in of four rib parts each, the drill is moved one rib de-icing.

The welding machine works in such a way that the Part of the hip is captured by the electrodes and against the Pipe to be pressed. When the welding current is switched on the rib sections are connected to the ear by a slight torsion of the electrodes. The welding process must to avoid deformations in ^ Böhr and rib sections, so quickly that an electronic control of the Welding current is appropriate if not essential.

Protection claim ./.

Claims (1)

S c h u t ζ a it s ρ r u c h Ribbed tube with square ribs, characterized "that the square butts along the diagonals of the squares are divided into four filing pieces and are each torn. The opposite side pieces are at the same time aitl 4 © lt Bohr dxtreh electrical resistance welding Terbuuaen ^ whereby the welding of the stacks of ribs by an automatic welding machine with automatic feeding of the stacks of ribs from storage cassettes to the electrodes, with mechanical tensioning of the ribs on the electrodes * with controlled electrode feed, Contact pressure * Welding current and standing pressure and with automatic gate push of the hoop, according to the desired splitting of the legs.