Heating device

Abstract

A heating device, including a gas or oil burner in a cylindrical combustion chamber radially bounded by a heat exchanger, at least one gap for the passage of heating gases through the heat exchanger into an exhaust-gas collection chamber, which is radially outside of the heat exchanger and has a surrounding shell having a connection nozzle for an exhaust gas line, a front cover element for accommodating the burner, a rear cover element as a closure for the combustion chamber, and supply/return connection nozzles. The present system is intended to optimize the heat exchanger so as to achieve the most compact possible dimensions and efficient heat transfer properties. The heat exchanger includes annularly configured heat exchanger tubes that are disposed in parallel to the longitudinal axis of combustion chamber, which each form an axially extending gap between two adjacent heat exchanger tubes for passing heating gases in the radial direction.

1 - 16 . (canceled) 
     
     
         17 . A condensing heating device, comprising:
 one of a gas burner and an oil burner in a cylindrical combustion chamber that is radially bounded by a heat exchanger, wherein there is at least one gap for a passage of heating gases through the heat exchanger into an exhaust-gas collection chamber which is configured radially outside of the heat exchanger and which has a surrounding shell having a connection nozzle for an exhaust gas line;   a front cover element for accommodating the burner;   a rear cover element as a closure for the combustion chamber;   supply connection nozzles; and   return connection nozzles;   wherein the heat exchanger includes a plurality of annularly configured heat exchanger tubes that are disposed in parallel to a longitudinal axis of the combustion chamber and that form an axially extending gap in each case between two adjacent heat exchanger tubes for the passage of the heating gases in the radial direction.   
     
     
         18 . The heating device of  claim 17 , wherein a cross section of the heat exchanger tubes is one of round, oval, and flattened to enlarge a length of the gap in the radial direction. 
     
     
         19 . The heating device of  claim 17 , wherein the heat exchanger tubes have at least one of a box-shaped cross section and a trapezoidal cross section. 
     
     
         20 . The heating device of  claim 17 , wherein the heat exchanger tubes are traversed by flow on the water side, in parallel, from one end face to the other, and wherein the return connection nozzle is installed in the one cover element and the supply connection nozzle is in the other. 
     
     
         21 . The heating device of  claim 17 , wherein all of the heat exchanger tubes are hydraulically interconnected in a serial configuration via deflection zones at the end faces, so that in at least one of the front cover element and the rear cover element, the flow is deflected into the respective adjacent heat exchanger tube. 
     
     
         22 . The heating device of  claim 17 , wherein the heat exchanger tubes are traversed by the supply and return water flow in alternating sequence on the periphery, and the flow is deflected within at least one of the front cover element and the rear cover element, either from a first heat exchanger tube that conducts return water, to an adjacent heat exchanger tube that conducts supply water, or via a shared deflection chamber from all heat exchanger tubes that conduct return water to all heat exchanger tubes that conduct supply water. 
     
     
         23 . The heating device of  claim 17 , wherein the heat exchanger tubes are subdivided in each case into at least two flow channels. 
     
     
         24 . The heating device of  claim 23 , wherein the at least two flow channels are subdivided by at least one dividing wall into an inner flow channel, which is proximate to the combustion chamber, and at least one outer, larger-diameter flow channel. 
     
     
         25 . The heating device of  claim 17 , wherein the at least two flow channels are hydraulically interconnected within one heat exchanger tube, so that starting out from a water distribution chamber at the end-face side, the outer, larger-diameter flow channel is first traversed by the flow of cooler return water in parallel in all individual heat exchanger tubes, and subsequently thereto, the inner flow channel, which is proximate to the combustion chamber, is traversed in parallel by the flow of warmer supply water. 
     
     
         26 . The heating device of  claim 17 , wherein all of the flow channels in all heat exchanger tubes are hydraulically interconnected in a serial configuration via deflection zones at the end faces and resulting in an interlinking of all flow channels. 
     
     
         27 . The heating device of  claim 17 , wherein when heat exchanger tubes having at least two flow channels are used, in each case, all outer flow channels, which are distant from the combustion chamber, and all inner flow channels, which are proximate to the combustion chamber, are serially connected, so that starting out from the return connection nozzle in a cover element, first all outer flow channels and subsequently thereto, all inner flow channels are traversed by flow. 
     
     
         28 . The heating device of  claim 17 , wherein when heat exchanger tubes having at least two flow channels are used, the flow emerges at one end face in each case from an outer flow channel, which is distant from the combustion chamber, of a first heat exchanger tube and enters into the inner flow channel, which is proximate to the combustion chamber, of the next adjacent heat exchanger tube, and the flow at the other end face emerges in each case from the inner flow channel of this heat exchanger tube and flows over into the outer flow channel of the same heat exchanger tube. 
     
     
         29 . The heating device of  claim 17 , wherein in a heat exchanger tube, the inner flow channel that is proximate to the combustion chamber has a smaller cross section than the outer flow channel that is distant from the combustion chamber. 
     
     
         30 . The heating device of  claim 17 , wherein the inner flow channel, which is proximate to the combustion chamber, in a heat exchanger tube is dimensioned so that higher flow velocities arise than in the outer flow channel, which is distant from the combustion chamber. 
     
     
         31 . The heating device of  claim 17 , wherein the geometry of the gap for the passage of heating gases between the heat transfer surfaces bounding the gap is able to be influenced by the deformation process during manufacture of a heat exchanger tube. 
     
     
         32 . The heating device of  claim 17 , wherein one or two adjacent, mutually opposing surfaces delimiting the gap are provided with projections that define the width of the gap and that are braced against at least one of each other and the opposing surface.