WAERMEAUSTAU

The invention concerns a heat exchanger, in particular warm water heating element, with an axially running central channel and a number of radial and in the cross section of the heat exchanger star shaped arranged axially running and radial channels, whose are evenly trained both walls thin-walled in each case and essentially S, connected by their entire length with the central channel, as well as with two connection pipes. A heat exchanger of this kind is well-known from the US-PS Nr.1, 838.083. With the well-known Wärmeausta it concerns a casting body, whose extent wall is curved for the enlargement of the heat exchange surface. The wave valleys can run in accordance with an alternative vertically and after another alternative horizontal. In the case of the first alternative would genericin accordance with-eat training results, with which however the radial channels are relatively broad and diverge to the central channel. All radial channels flow above and down in einstückig cast on heads, whose outer contour coincides with an imaginary cylinder, up to which radial channels outward extend. The DE-OS 1928146 shows a genericstrange heat exchanger with an amount of disk's pairs, which limit ever several flow channels and at the circulating edges are welded with one another. Between two disk's pairs each are zigzag bent air guide inserts. Task of the invention is it to train heatfrom rope rather the kind initially specified in such a way that its heat exchange ability is improved with same building extent and economical production is made possible. This task is solved according to invention thereby that two the channel walls each of each radial channel in smaller distance run over its entire radial extending parallel and that the all channel walls from at least one, at of central kana! turned away outer edge of each of the radial channels around an angle of at least approximate 180° and to, the Zen2S tralkanal turned interior edge of the two channel walls of two neighbouring radial channels around an angle, which lies within the range of 90 and 160°, curved sheet metal cut exist, whereby the close connection of the radially running neighbouring Stirnkanten of the two channel walls of each of the radial channels is formed by means of a soldering seam or a welding seam. The production of a heat exchanger from a sheet metal plate reduces the manufacturing costs considerably. Since the radial channels exhibit constant very small width, the water volume contained in is small with which a large relationship from Wärmeaustausehfläche to the enclosed water volume is reached. The closely neighbouring arrangement of the two channel walls of each radial channel makes possible further, the neighbouring Stirnkanten by only one Schweißa5 or soldering seam approaches in each case to interconnect, whereby the manufacturing costs are not only lowered, but also the air-lateral outside space between in each case two radial channels remains at the front side open. Air can flow through thus without any handicap the heat exchanger in axial direction fully. In order to plan a symmetrical arrangement, an arrangement of the invention lies that the angle between the channel walls of neighbouring radial channels is equal the difference from 180° and the quotient from 360° and the number of the radial channels. A favourable arrangement consists further of that the interior edges of all channel walls are to the outside diameter of the coaxially arranged connection pipes appropriate diameter on a circle with. Thus once the water volume are made smaller, reached further a maximum size of the channel walls and finally made possible a simple assembly of the connection pipes, which are soldered and/or welded when the front side Zulöten or welding the radial channels shut with. Finally to be noisy-exchangebe able still by the fact it is increased that in each case between the two channel walls of two neighbouring radial channels a lamella package with oh savings alleles and about right-angled for the bisector of the two radial channels running, which channel walls affecting lamellas is arranged. On the basis the designs, some Ausführungsbeispie! represent, the subject of the invention one describes. Fig show.! a perspective opinion of a remark example of a heat exchanger, partly on average, Fig.2 a radial cut by the heat exchanger after Fig.1 in increased yardstick along the line 2-2 in Fig.3 and Fig.3 an axial section by the heat exchanger after Fig.2 along the line 3-3. The heat exchanger --10-- consists of seven wings --12--, which are arranged star shaped and also in this example same angle distances. Each wing --12-- points two even channel walls arranged parallel in small distance --14 and 16-- of constant of width up, those at their outer edge --18-- are closely connected. Neighbouring channel walls --14, 16-- together-bordering wing --12-- are at their interior edge --20-- connected. Stirnkanten --22-- the wing --12-- are course-soldered or welded shut. Each Flül0 gel --12-- has thus a flat wide radial channel --24--, that over its whole length neighbouring the interior edge --20-- with a central channel communicates. Into this approximately tubular central channel are at the front side two Ansehlußrohre --28-- begun and with the Zulöten of the Stirnkanten --22-- with a soldering seam --30-- soldered on. The heat exchanger is made of a einstückigen sheet metal cut, which is bent alternating inward and outward, whereby the interior bend is made by an angle, which itself from the difference from 180° and the quotient from 360° and the wing number (7) builds up, while the external bend amounts to 180°. In the case of seven wings --12-- with ever a wing width of 7 cm arises considering the addition for the outer edges --18-- and for the interior edges --20-- a completed Zusehnittlänge of 100 cm. In the distance from 7 cm of a trailing edge of the cut this is bent around 128,6°. After again 7 cm the cut in opposite direction is back-bent around 180°. Then effected after again about 7 cm one interior bend around the angle mentioned from 128,6° etc. after seven interior bends and six external bends lie again the two trailing edges of the cut neighbouring to each other and become an outer edge --18-- course-soldered. Around the channel walls --14 and 16-- in the small constant distance to hold, are in accordance with Fig.2 and 3 inside at the channel walls --14 and 16-- punctual projections/leads --32-- arranged. For the increase of the halflateral heat exchange surface is between ever two wings --12-- a lamella package --34-- begun, which from parallel lamellas --36-- , those exists essentially evenly trained and right-angled as the angle halving level between two neighbouring wings each --12-- are arranged. The opposite ends of the lamellas --36-- are alternating with neighbouring lamellas --36-- connected. All lamellas --36-- it is so long that it to the channel walls --14 and/or 16-- knock against. Each lamella package --84-- is schlangenlinienförmig curved from a sheet metal cut. The lamella packages --34-- have about the same length as the wings --12-- and become at these by means of front side guard rings --38-- held, those the outer edges --18-- cover themselves and at those the lamella packages --34-- with the outermost lamella --86-- support. In place of the two front side guard rings --38-- also a sheet-steel jacket with circle-cylindrical or also polygonal can outlined to be used. Into the central channel, that of the interior edges --20-- , is a check body is limited --40-- imprinted, that before using the connection pipes --28-- one festgelötet. It is important that the check body --40-- of the upper and lower connection pipe --28-- a sufficient distance has, so that the water flow is not obstructed. The check body can itself over almost the entire length of the heat exchanger --10-- in addition, extend, it can two short check bodies --40-- to be soldered above and down, as this Fig.3 illustrates. The check body --40-- prevents a direct current from the upper connection pipe --28-- by the central channel to the lower connection pipe --28--. The water must from there by the radial channels --24-- flow. In place of the production of the heat exchanger --10-- from a sheet metal cut also the production is in form of an aluminum extruded section possible, u.zw can both the star shaped heat exchanger --i0--, and the lamella element --34-- in the extruding procedure to be manufactured. If the heat exchanger from a sheet metal cut is bent, then the heat exchange surface becomes relative the total volume of the heat exchanger with a wing number of 7 and its manufacturing costs optimizes. Good results can be reached also with 6 or also 8 wings. Against it if the heat exchanger in the extruding procedure is manufactured, then it lies in the context of the invention a larger wing number to use in particular more than 10 wings. Mebrere of the heat exchangers --10-- can be placed next to each other and by means of T-fittings water-laterally joined in parallel, in order to form a heating element. The distance of two heat exchangers can be not only at least the same as the double wing width, but it can be also smaller, because neighbouring heat exchangers can be inserted into each other concerning their wings, if one does within the box range without the lamella elements. To water-and - driving off pipes do not have to flow necessarily at the front side central, on the contrary a Zufuhrrobr running right-angled to the star axle can be e.g. attached to a wing externallaterally, whereby this pipe can be passed through a hitting a corner recess of a wing. This is preferably the wing, which must be soldered at the outer edge. The expiration pipe runs then by a lower hitting a corner recess preferably the same wing. Both pipes have slots, which flow in the wing bag. The water pipes run then not outside but within the height of the heat exchanger. The central ate - derivative results in however an even heat distribution of the wings. In the managing a heat exchanger with symmetrical form and arrangement of the wings was described. It lies easily in the context of the invention to arrange the wings radially however in different angle angles about in such a manner that in the front half of more wings than in the Hinterhälfte are present. In the Hinterhälfte or the wings can escape another part of the entire heat exchanger extent even completely or be able it there narrower wings, i.e. use such with smaller radial aspect ratio, i.e. for the purpose to create a heat exchanger with reduced building depth. Also such special cases fall under the scope of protection.