Sectional boiler

Abstract

A sectional boiler is described as being made of cast iron or aluminum, in particular a condensing boiler, having essentially annular sections, a front section, a cover-shaped rear section and at least one center section being provided, which form a combustion chamber having an essentially surrounding heat exchanger made of a sectional block, whose annular water chambers are connected to one another via at least one hub and which has gap-like heating gas flues, having a return port and a feed port in the upper area and at least two armature rods for holding the sectional block together. The present system is based on the objective of optimizing a sectional boiler made of cast iron or aluminum particularly with respect to compactness and robustness. In the present system, as heating gas flues the heat exchanger respectively has annular gaps between two adjacent sections having a mutually adapted geometry, which respectively run from the combustion chamber approximately radially outward and open into an exhaust gas collection chamber on the outside of the sections, and the individual sections are respectively divided on the heating water side into at least two flow channels.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a sectional boiler, in particular a condensing boiler made of cast iron or aluminum materials.BACKGROUND INFORMATION[0002]Sectional boilers of this kind are made up of multiple boiler sections cast in one piece, which are arranged one behind the other and are connected to one another on the water side by hubs. A flow is thus created through the water channels and water pockets formed by the boiler sections between the return port and the feed port. Normally, generic sectional boilers have a lower return port and a feed port situated on top, which may be in the respective hub. The heating gases flow from the combustion chamber via downstream heating gas flues to an exhaust gas connection and on their way give off heat to the boiler water.[0003]In all existing boilers of this kind, the sections are arranged in series one behind the other. There is an annular front section, on which a combustion chamber door or a burner plate...

AI Technical Summary

Benefits of technology

[0021]The exemplary embodiments and / or exemplary methods of the present invention provides a sectional boiler with the best suitability for condensing heating operation, in which the positive material properties of cast iron or aluminum are specifically applied and utilized in order to ensure good heat transfer properties, compactness and robustness. Operating states and loads that trigger corrosion are minimized by the water guidance according to the exemplary embodiments and / or exemplary methods of the present invention. Dividing the flow channels optimizes the temperature distribution in the heat exchanger and increases the effectiveness with respect to known principles.

[0022]According to the exemplary embodiments and / or exemplary methods of the present invention, it is also not only easy to apply and check a corrosion protection coating, but the latter is also protected in the gaps against possible mechanical stresses. In addition to the simple manufacture, the sectional construction also offers the advantage of allowing for different lengths for various heating and heat exchanger performances in a variable manner by inserting additional center sections. All water-side connections, for example, are located for easy access on one side in the upper region. Nevertheless, all front-side attachment parts as well as the water-side connections remain the same. Only the surrounding jacket around the exhaust gas collection chamber varies. Due to the low exhaust gas temperatures, the latter may even be manufactured from plastic.

Problems solved by technology

Disadvantages are the high costs associated with the material as well as the less favorable scaling conditions especially in welded constructions of sheet metal, and the greater sizes, which are difficult to assemble in tight spatial conditions.

In today's form and design, cast iron is not suitable for condensing heating operation, however, where condensed water is produced for a longer period.

All boilers having a heat exchanger connected downstream have the disadvantages of increasing the assembly efforts because of the required pipe pieces and of raising the resistance on the water side.

The positioning as a separate exterior component also results in cooling losses, which must be reduced by a suitable thermal barrier.

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