Latent heat exchanger in condensing boiler

Abstract

A latent heat exchanger of a condensing boiler, in which the condensing boiler includes a sensible heat exchanger absorbing combustion sensible heat generated by a burner, a latent heat exchanger absorbing latent heat of water vapor contained in a combustion product heat-exchanged by the sensible heat exchanger, an exhaust hood discharging the combustion product flowing through the latent heat exchanger, and a condensed water outlet discharging condensed water generated from the latent heat exchanger. In the latent heat exchanger the combustion product burnt by the burner flows through the sensible heat exchanger, is vertically raised toward the latent heat exchanger, is slantingly lowered in an outward direction at an acute angle from a horizontal plane, is heat-exchanged by the latent heat exchanger, is vertically raised, and is discharged to the exhaust hood.

1 . A latent heat exchanger of a condensing boiler, in which the condensing boiler includes a sensible heat exchanger absorbing combustion sensible heat generated from a burner, a latent heat exchanger absorbing latent heat of water vapor contained in a combustion product heat-exchanged by the sensible heat exchanger, an exhaust hood discharging the combustion product flowing through the latent heat exchanger, and a condensed water outlet discharging condensed water generated from the latent heat exchanger, characterized in that
 the combustion product burnt by the burner flows through the sensible heat exchanger, is vertically raised toward the latent heat exchanger, is slantingly lowered in an outward direction at an acute angle from a horizontal plane, is heat-exchanged by the latent heat exchanger, is vertically raised, and is discharged to the exhaust hood.   
     
     
         2 . The latent heat exchanger according to  claim 1 , wherein
 the latent heat exchanger includes a plurality of tubes in front and rear inner sides of the latent heat exchanger,   the tubes are vertically disposed at predetermined intervals,   the tubes are inclined downward toward front and rear outer sides of the latent heat exchanger, and   the tubes form flow paths so that the combustion product that flows through the sensible heat exchanger is vertically raised at an acute angle from the horizontal plane, and is divided and slantingly lowered in a frontward/rearward direction or in a leftward/rightward direction, and exchanges heat with the combustion product.   
     
     
         3 . The latent heat exchanger according to  claim 2 , wherein cross sections of the tubes have a flat elliptical shape so that sides thereof, through which the combustion product flows, have widths greater than heights of opposite ends thereof in a flat elliptical shape. 
     
     
         4 . The latent heat exchanger according to  claim 2 , including a plurality of heat-exchanging fins coupled to outer surfaces of the tubes, and which are located on the front and rear inner sides of the latent heat exchanger, at predetermined intervals, in a lengthwise direction of the tubes. 
     
     
         5 . The latent heat exchanger according to  claim 2 , including an upper guide having opposite front and rear ends that are inclined faces corresponding to an inclined angle of the tubes, located at an inner upper portion of the latent heat exchanger. 
     
     
         6 . The latent heat exchanger according to  claim 2 , wherein the condensed water outlet is located on one side of a lower portion of the latent heat exchanger, and including
 lower guides, which guide condensed water, which is collected on outer surfaces of the tubes and falls downward, toward the condensed water outlet located below the tubes of the front and rear inner sides of the latent heat exchanger.   
     
     
         7 . The latent heat exchanger according to  claim 2 , wherein opposite left and right ends of the tubes are coupled to left-hand end plates and right-hand end plates in which tube insertion holes having a shape corresponding to the tubes are located, and left-hand flow path caps and right-hand flow path caps and are coupled to outer sides of the left-hand end plates and right-hand end plates to guide the heat medium flowing along interiors of the tubes so that the flow path of the heat medium is alternately changed from left to right and from right toe left in the latent heat exchanger. 
     
     
         8 . The latent heat exchanger according to  claim 7 , wherein:
 the left-hand flow path cap includes an upper flow path cap splitting and feeding the heat medium flowing into an inflow pipe to the tubes located at opposite front and rear sides thereof, a plurality of intermediate flow path caps vertically located at opposite front and rear sides thereof and changing the flow paths of the heat medium, and a lower flow path cap collecting the heat medium flowing through the tubes located at the opposite front and rear sides thereof and discharging the collected heat medium to an outflow pipe; and   the right-hand flow path cap includes a plurality of sets of flow path caps vertically located at opposite front and rear sides thereof and changing the flow paths of the heat medium.