DE3416840A1 - Method for the production of a heating boiler with a double-walled, meander-shaped plate as a part for carrying a heat transfer medium - Google Patents

Abstract

Method for the production of a heating boiler, in which the water-carrying part is designed as a double-walled plate with outward-facing knobs, is bent in a meander shape and forms a circular starting space in which a burner is arranged, and in which a pipe coil can be present within the plate, in which two half-shells with bent-up edges (2) are produced and provided with the knobs (4) by rolling or pressing (6), the half-shells (1) are bent in a meander shape and are brought together with their edges (2), if required with the insertion of the pipe coil (5) and the gap between the edges (2) is then welded up. In the method, the half-shells (1) are preferably produced by extruding aluminium and the knobs (4) are rolled into the still hot material immediately following extrusion. <IMAGE>

Description

Title: Method of making a heating boiler

with a double-walled, meander-shaped lamella as a heat transferring Medium leading part Method of making a heating boiler with a double-walled, meander-shaped lamella as a heat transfer medium leading part The invention relates to a method for manufacturing a heating boiler, in which the part carrying a heat transfer medium is a double-walled lamella is formed with outwardly pointing knobs and is bent in a meander shape, and one forms circular starting space in which a burner is arranged, being inside the lamella may have a coil.

Boilers of the aforementioned type are z. B. in the earlier patent application P 33 33 730.6 exactly described by the applicant, so that a description of this Position can be omitted. Reference is expressly made to the application mentioned.

There are already various methods of producing the aquifer Parts of boilers known in which either cast parts are attached to one another or pipe registers are welded to floors. Disadvantageous with these known However, it is a process that production is expensive and this process is not are suitable for producing condensing boilers where because of there is an increased risk of corrosion of the acidic condensate and only a few materials can be used.

It is the object of the invention to provide a method for producing the register a boiler or the double-walled lamella used for this in the corresponding To create a configuration in which the aforementioned disadvantages no longer occur, and that in particular allows a boiler with a double-walled fin to produce in a meandering shape in a particularly simple manner.

The method according to the invention is intended in particular for fully automatic Production of the mentioned meander-shaped lamella are used, with workpieces being the highest Quality made of acid-resistant materials such as aluminum or V4A can be used should. The production should continue to be particularly economical to carry out and enable high-volume production.

This object is achieved according to the invention in the method mentioned at the outset solved in that two half-shells are produced with upturned edges and by means of Rolls or presses are provided with the knobs, the half-shells meander-shaped bent and put together with their edges, possibly with the addition of the pipe coils will and then weld the gap between the edges.

Alternatively, the half-shells can be made by extruding aluminum are generated, the knobs after extrusion into the still heated material be rolled in, or the half-shells can be made from aluminum sheets whose edges and knobs are raised or lowered when they pass through rollers.

be pressed in.

The process can be used to produce particularly large numbers of items that the half-shells are produced in a continuous flow, nubbed and meander-shaped bent and then cut into pieces for a cauldron of the required length will.

Alternatively, the pieces can also be cut to the required length take place before the meander-shaped bending. For both manufacturing alternatives it is but it is essential that the upturned edges during the meandering bending held in their position perpendicular to the bottom of the half-shells and their edges thereafter be pruned.

In detail, the bending can be done in such a way that by means of roll the bending points are mutually deflected (transverse movement) and to that in an axial direction Direction the bending points are moved next to each other (longitudinal movement) and so that necessary material is drawn automatically. After the bending will be finished the rollers pulled out to the side for bending. This can be before or after pruning take place.

In the following an embodiment of the invention is based on EsHer schematic representation described in more detail.

Half-shells 1 with raised edges are made from an extruder 2 extruded from aluminum, which directly after the extrusion by nub rollers 6 with Knobs 4 are provided in the required distribution. The half-shells 1 with Edges 2 and nubs 4 are then continuously moved by means of bending rollers 8 in Brought meander shape, the rollers or rollers 8, the bending points 5 alternately deflect (transverse movement) and at the same time move in axial direction towards each other (longitudinal movement) and so pull up the necessary material. Then the roles are pulled out and the meander parts created in this way are also meander-shaped with the insertion of a shaped coil 5 inserted into one another.

The meander parts are in their final shape after bending have been trimmed at the bending points and after the parts have been joined together the edges of the margins are welded together automatically.

As an alternative to extrusion, sheet metal can also be used as the starting material are processed, the edges of which are raised in a folding or rolling process will.

In the case of a rolling process, it is advantageous to raise the edges 2 and the formation of the knobs 4 in one set of rollers.

Around the bending rollers after bending the meander parts at in the bending points to be able to remove inwardly pointing edges 2, the rollers are on rollers 8 advantageously split or semi-cylindrical.

After separating the halves from each other or after turning of the half-cylinder, this can be pulled out easily. The division can be advantageous multiple times.

It is essential in this context that the already meander-shaped deformed half-shells are fixed in order to be assembled. Advantageous will the two half-shells are pushed together gen, whereby these are held at the bending points.

The sheet metal strips are used to make it easier to meander slightly pre-creased and then folded under pressure, so that the shaping by the bending rollers 8 only means setting the end contours.

The edges 2 are also fixed in this process to their Prevent erecting. The edges 2 are so pressed laterally and both fixed in terms of their position as well as their length, so that a cutting before the joining and welding can be omitted. When the meander is bent it takes place So at the same time straightening the edges 2.

According to the invention, the half-shells can also be produced by casting rolling take place, with the required dimensional accuracy also as with extrusion rolling can take place. A certain temperature can be used in a tempering channel from Z. B. 2500 C, so that the half-shells for the following Deformation possess sufficient plastic properties.

To a corrosion of the annulus in the lowest area as well as a corrosion at the areas to prevent at which the knobs on the opposite one Side, the lower area mentioned as well as the knob tips can advantageously Covered with silicone rubber, silicone or rubber using application rollers will. In a further embodiment of the invention, it is also possible to use the half-shells to be anodized entirely on one side or only in the desired areas. Also because of that corrosion is reliably prevented. Blank page

Claims (12)

Claims: 1. A method for producing a heating boiler in that of the water-bearing part as a double-walled lamella with outward-facing knobs is designed and bent in a meander shape and forms a circular starting space, in which a burner is arranged, with a pipe coil inside the lamella can be present, characterized in that two half-shells with bent open Edges (2) generated and provided with knobs (4) by means of rolling or pressing (6) are, the half-shells (1) bent in a meander shape and with their edges (2) under optionally insertion of the pipe coil (5) are brought together and on it the gap between the edges (2) is welded. 2. The method according to claim 1, characterized in that the half-shells (1) are produced by extruding aluminum and the knobs (4) after extrusion be rolled into the still heated material. 3. The method according to claim 1, characterized in that the half-shells (1) are made of aluminum sheets, the edges (2) and knobs (4) at Run through be raised by rollers. 4. The method according to claim 3, characterized in that the nub and the raising of the edges (2) takes place between a pair of rollers. 5. The method according to any one of claims 1 to 4, characterized in that that the half-shells (1) produced in a continuous flow, dimpled and meandering bent and then cut into pieces for a cauldron of the required length will. 6. The method according to any one of claims 1 to 4, characterized in that that the half-shells (1) are produced and napped in a continuous cycle and before the meandering bending into pieces for a boiler of the required length get cut. 7. The method according to any one of claims 1 to 6, characterized in that that the upturned edges (2) during the meandering bending in their position held perpendicular to the bottom of the half-shells and then trimmed their edges will. 8. The method according to any one of claims 1 to 7, characterized in that that the meandering bending means Roles takes place which the Deflect the bending points (5) alternately (transverse movement) and in the axial direction move the bending points next to each other (longitudinal movement) and so there necessary material tighten and then the rollers are pulled out to the side. 9. The method according to any one of claims 1 to 8, characterized in that that the meander parts before their assembly at least on their in the direction of the The surface showing knobs can be anodized. 10. The method according to any one of claims 1 to 8, characterized in, that the lamellae at the tips of the knobs and in the lower area of the annulus be provided with a layer of silicone rubber, silicone or rubber. 11. Device for performing the method according to one of the preceding Claims, characterized in that the rollers or rollers (8) are half-shells or are divided several times. 12. Device for performing the method according to one of the preceding Claims, characterized by holders of the meander half-shells at the bending points for joining the shells together.