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.

1 - 9 . (canceled) 
     
     
         10 . A sectional boiler made of one of cast iron and aluminum, which is a condensing boiler, comprising:
 essentially annular sections, including:
 a front section; 
 a cover-shaped rear section; and 
 at least one center section; 
   wherein the sections 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, and   wherein 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.   
     
     
         11 . The sectional boiler of  claim 10 , wherein each section has at least one separating wall on the heating water side and is thereby divided into at least one inner flow channel near the combustion chamber and at least one outer flow channel of a greater diameter. 
     
     
         12 . The sectional boiler of  claim 10 , wherein the at least two flow channels in a section in the area of the lower hub are hydraulically connected to each other by an overflow opening in the separating wall so that the flow passes through them in series, initially in the two halves of a section, return water from the upper return port reaching the bottom in the respectively outer flow channel of a larger diameter, flowing inward at overflow opening, and then again reaching the feed port at the top in the two halves of a section, respectively in the inner flow channel near the combustion chamber. 
     
     
         13 . The sectional boiler of  claim 10 , wherein the inner flow channel near the combustion chamber has a smaller cross section than the outer flow channel far from the combustion chamber. 
     
     
         14 . The sectional boiler of  claim 10 , wherein the inner flow channel near the combustion chamber is dimensioned so that higher flow speeds set in than in the outer flow channel far from the combustion chamber. 
     
     
         15 . The sectional boiler of  claim 10 , wherein the return port is situated in the area of the upper hub above the feed port, and a feed-in pipe for return water is provided, which respectively has at the level of the section at least one opening for feeding return water into the outer flow channel far from the combustion chamber of each section. 
     
     
         16 . The sectional boiler of  claim 10 , wherein at least one of a feed-in pipe for return water, a withdrawal pipe for feed water, and an armature rod situated within the hubs is used for holding together the sectional block. 
     
     
         17 . The sectional boiler of  claim 10 , wherein the feed port is situated in the area of upper hub below return port, mutually aligned openings being provided between the individual sections, which act as a connection between the respective inner flow channels near the combustion chamber. 
     
     
         18 . The sectional boiler of  claim 10 , wherein in the area of the lower hub the individual sections are sealed with respect to one another, and wherein at least one of a closing arrangement and a sealing arrangement is attached on an armature rod situated within the hub.