DE1994414U - EXTRUDED HOLLOW PROFILE WITHOUT LONGITUDINAL WELD SEAM ON THE PRESSURE-CARRYING CROSS-SECTIONS FOR THE PRODUCTION OF SEAL-WELDED HEATING OR COOLING SURFACES. - Google Patents

Description

P.A. 278 905 * 15 5-

L. & C. Steinmüller GmbH 527 Gummersbach, 1p. 5-1-968

Gm 6824 Go / Bl.

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"Extruded hollow profile ₈ / without longitudinal weld seams on the pressure-carrying cross-sections for the production of tightly welded heating or cooling surfaces"

The invention relates to extruded hollow profiles without longitudinal side seams on the pressure-carrying cross-sections for the production of tightly welded heating or cooling surfaces with smooth exterior walls.

There are round and rectangular tubes known, with and without fins or webs to each other gas-tight surfaces are welded. The pipe wall surfaces made from round pipes have a filled surface transversely to the longitudinal axes of the pipes and are therefore unfavorable in terms of flow for the external medium, or they are result in erosion in the case of media containing dust or contamination in the case of adhering media. Pipes of square or rectangular

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Cross-section are up to now for the sake of

uniform wall thickness and strength not

l'i perfectly sharp-edged, but also with one

small rounding carried out, so that also with the

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a heating surface made from these tubes

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slightly wavy surface cannot be avoided is. In addition, rectangular bores are because of the Strength at high pressures is either unsuitable or has too great a wall thickness.

It is also known to use round containers for heat transfer purposes or cylindrical elements, e.g. B. for cooling burner mouths from round or to weld together rectangular extruded profile tubes.

There are also known extruded pipes with fins attached to one side, from which pipe walls with a smooth and a corrugated surface getting produced.

Furthermore, tubular profiles are known which have a circular cross-section on the inside and a semicircular cross-section next to them have cut, so that when welding together, each whole circle cross-cuts arise. These profiles have, especially for the Production of burner mouths has the disadvantage that an open semicircle remains at the end, which must be removed and also on each one second pressurized circular cross-section two Longitudinal welds are present.

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The object of the present invention is to provide a To create an extruded hollow profile for the production of tightly welded Heizxlachen, the "Forms smooth outer walls, no high pressure seals Requires longitudinal welds and one at the end Heating surface does not have any significant webs or return lines protruding into the heating space.

To solve this problem, a profile is proposed, that is circular on the inside, on two opposite parallel sides on the outside, the ends of which are bevelled, is flat, and that between the two parallel flat surfaces is bounded by convex arcs »(Pig. 1)

According to a second preferred form of the invention, a flat or slightly twisted web is used in the circular cross-section, so that two separate channels are formed in the tube, z. B. for the outward and return flow of the heat over he carrier medium can be used, (J ¹ Ig .. 2) In the case of flat webs, it can be useful to provide the hollow profile inside with two hats corresponding to the web size opposite each other. With regard to the later curvature of the hollow profile, it is expedient to arrange the flat web parallel to the flat outer surfaces of the pipe. Because of the reduction in wall thickness due to the longitudinal groove, it is better to arrange the webs diagonally, while for reasons of better temperature compensation, palles are also conceivable where the e - / + or cooling ./.

flat bar perpendicular to the flat outer surfaces of the hollow profile is arranged.

According to a third preferred form of the invention, an inner smaller one is inserted into the outer tube Tube inserted and spaced with several bars on the circumference against the inner wall of the large tube, so that there are also two separate channels for the outward and return flow. This drill can expediently be closed with a spherical bottom and thus enable a diversion from the outward to the return. (Fig. 3)

According to a further idea of the invention, heating or Coiled cooling surfaces and welded to one another in a gas-tight manner. Either two or several tubes, each containing only one channel, wound and welded together and connected at the end with a deflection bend that the heat-transferring medium in a pipe back and forth runs back in the other pipe, or it becomes just one Pipe, but containing two channels, wound together to form a heating surface and welded, then the heat-transferring medium flows in one channel, back in the other and becomes at the end of the pipe deflected in a spherical base.

Possible embodiments of the invention are described below with reference to several figures:

Figure 1 shows a hollow profile without internals.

Figure 2 shows a hollow profile with a web that divides the profile into two channels.

FIG. 3 shows a hollow profile with an inner tube spaced apart by webs.

Figures 4 to 13 show possible applications of the proposed hollow profiles, -

Figure 4 shows the cooling system of a pulverized coal burner This consists of an inner cooling jacket ("IJ, -which is concentrically enclosed by two further cooling jackets 2 and 3. The Inner cooling jackets 1 carry the core air, the dust-laden air flows between jackets 1 and 2 Enclose carrier air flow and jackets 2 and 3 the secondary air flow.

FIG. 5 shows a cooling jacket made from a double spiral, FIG. 6 as a detail of the end of the double spiral facing the combustion chamber, and FIG. 7 a section III-III through FIG ^.

Ia Figure 8 is one of a simple spiral The cooling jacket created is shown schematically. Figure 9 shows this as a detail of the dem The end of the winding facing the combustion chamber, while FIG. 10 shows a section TI - YI through FIG shows.

FIG. 11 again shows a cooling jacket as described in FIG. 8, FIG. 12 the associated one Pipe end, Figure 13 the section IX - IX of Figure 12.

The profile tube shown in Figure 1 is over one of the flat sides bent in the form of a cylindrical spring and formed into a cylinder? welded together, so that one (possibly after outsole tires of the welds 6) is given a cylinder with a smooth surface.

Since the inflow and outflow of the coolant must be arranged on one and the same side, one pipe end Λ on the outside of the cylinder is returned along with single-thread screw windings (Figure M- _f pos. 1 to 3). This can be avoided if the cooling jacket is wound from a two-flight spiral (FIG. 5) and a deflection cap 5 is welded to the end of the cylinder facing the combustion chamber, as shown in FIG.

Claims (5)

Claims, ("ti ', ι; J, if, 1.) Extruded hollow profiles without longitudinal. . Weld seams on the pressurized cross-sections for the production of gas-tight welded heating or Cooling surfaces with smooth outer walls, characterized in that that the hollow profile (Fig. i) is circular on the inside, outside on two opposite sides, the ends of which are beveled, of parallel planes ! "laugh is limited while the profile consists of convex arcs between the two parallel flat surfaces. 2.) Extruded hollow profiles according to claim 1, since you rchgek en η ζ e ic h η et that in the clear circular cross-section (Fig. 2) a flat or slightly twisted web (8) is used, which the pipe cross-section in two separate channels divides. 3 ·) Extruded heat exchanger tubes according to Claim 1, d a d u r c h g e k e η η draws, that in the clear circular cross-section (Fig. 3) an inner smaller tube O) is used, which with several webs (10) on the circumference against the inner wall of the outer tube ". ■■ ■. ■ '■■■■ - ■■■■ -A '{ ί'J'ί ■
JUJ ¹ Iίΐ! Ai! !; ' ι, res is distanced and thus forms two separate channels, 4.) Heating or cooling surfaces made of z ^ '7ei helically are welded together in a gastight manner Extruded hollow profiles according to / Claim 1, characterized in that the heat exchanger medium in one hollow profile, runs back in the other and at the end of the two hollow profiles deflected by a semicircular deflector (5) will. · 5.) Heating or cooling surfaces from a gas-tight helically wound welded strand n hollow profile according to claim 2 and 3 »since you draw rc hg e k en η, that the heat transfer he medium in one of the two separate channels of the hollow profile hinim another runs back and at the end of the pipe in a spherical base (7) is deflected. / ⁺ lines