DE1061805B - Heat exchanger with longitudinal ribs arranged on both sides of a web - Google Patents

Description

GERMAN

The invention relates to a type of heat exchanger in which the heat exchange surfaces in both flow cross-sections are enlarged by longitudinal ribs and both lateral surfaces as heat exchange surfaces contribute. For this purpose, profiles are used, which are most economical in the extrusion process for example made of aluminum or lead, but also under pressure or Continuous casting process. For heat exchange between media whose heat transfer conditions are similar are, heat exchangers are used with approximately the same size exchange surfaces on both sides of the partition between the media. If the heat transfer conditions are not particularly good, the relatively large exchange surfaces make necessary, a surface enlargement by ribs is usually favorable because Rib surfaces are significantly cheaper than the surface of smooth tube walls that are simultaneously pressure-bearing.

Inside and outside ribbed tubes are made by soldering or welding individual ribs as well has already been produced by extrusion. They are used in conjunction with separate casing pipes the construction of heat exchangers. However, the jacket pipe reduces the hydraulic diameter of the outer rib space without promoting heat transfer. In addition, internal ribs are expensive because the Soldering can hardly be mechanized.

These disadvantages are avoided in a known manner if the ribs are arranged on both sides of a web are, the z. B. by inserted between the individual continuous metal ribs sealing strips can be formed. Such exchangers consisting of alternating ribs and sealing strips However, despite their advantages, they have not caught on because they are complicated to assemble Can hardly be manufactured economically from many individual parts and can only be used to a very limited extent are, because the flat side walls would be with a relatively low pressure load bulge out.

Both disadvantages can be avoided according to the invention in that the ribs and web from one Pieces are pressed and that the web is positively connected to the jacket by means of pressed-on extensions is.

This basic idea can be carried out in a number of ways. In the case of the ideal profile (FIG. 1), the production of which still encounters certain difficulties because of the hollow profile shape, the web, ribs and jacket are pressed from one piece. The jacket 1 enclosing both flow cross-sections is divided by a web 2. In order to adapt to the mostly different amounts of

Heat exchanger with both sides
a web arranged longitudinal ribs

Applicant:
Dipl.-Ing. Friedrich. Lohmann,
Bielefeld (Westphalia), Goethestr. 15th

Dipl.-Ing. Friedrich Lohmann ₁ Bielefeld (Westf.), Has been named as the inventor

Both media and the permissible pressure losses, the web is preferably arranged eccentrically. It has ribs 3 on both sides, which can be connected to the jacket.

The profiles according to FIGS. 2 and 3 are easier to manufacture in terms of compression technology. According to FIG. 2, lateral lugs 6 are pressed onto the ribbed web 4 , which are subsequently bent over the ribs 5 and connected to one another to form the jacket tube by longitudinal welds. To simplify welding, additional material 7 can also be pressed on.

In Fig. 3, a type of rectangular cross-section is shown. The web 8 again carries heat exchange ribs 9 and 10 on both sides. The jacket is formed by the two half-shells 11 and 12 , which are connected to the web edges and to each other by triple longitudinal welds. The drawn shape of the web 8 enables the use of the same half-shells in spite of unequal flow cross-sections. So that the half-shells 11, 12 do not bulge out under pressure, they are positively connected to the web by being pushed onto the beads of the ribs 10. The design according to Fig. 3 provides the following advantages:
1. space-saving arrangement z. B. on a wall;
2. With appropriately shaped deflectors at the ends, both the entire cross-section and parts of the same can be used as flow cross-sections on both sides of the web, with the ribs 10 connected to the jacket being used as a delimitation of the partial cross-sections. One and the same profile can therefore be used for very different quantities that would otherwise require exchangers of different sizes.

909 578/276

Claims (5)

Patent claims: 1. Heat exchanger with two flow cross-sections, through one on both sides with longitudinal ribs provided and enclosed by a jacket web are formed, characterized in that that the web and ribs are pressed from one piece and that the web by means of pressed Extensions is positively connected to the jacket. 2. Heat exchanger according to claim 1, characterized in that the jacket, web and ribs are pressed in one piece. 3. Heat exchanger according to claim 2, characterized in that the at the ends of the web located extensions are bent together over the ribs and welded together and so form the coat (Fig. 2). 4. Heat exchanger according to claim 1 with a jacket consisting of two half-shells, characterized characterized in that some extensions are designed as beads, which are in corresponding grooves of the Shell half-shells are inserted, and that the web edges with the half-shells by longitudinal seams are welded. 5. Heat exchanger according to claim 4, characterized in that the web ends are cranked in this way are that despite unequal flow cross-sections, both half-shells are the same. Considered publications:
British Patent No. 289,912;
U.S. Patent No. 924,005, 2,573,538;
Chemie — Ingenieur — Technik, Volume 27, 1955, No. 11, p. 681. 1 sheet of drawings © 909 578/276 7.59