Combustion apparatus

Abstract

An exhaust portion is connected to a lower peripheral edge of a secondary heat exchanger case, has an exhaust vent configured to exhaust combustion gas which has passed through the secondary heat exchanger case, and has a bottom surface including a first face parallel to the lower peripheral edge. A drainage water discharge port is configured to discharge drainage water from the first face of the bottom surface. The drainage water discharge port is provided, to avoid a region overlapping with the secondary heat exchanger case from a point of view as seen in an up-down direction, in an exhaust path from the secondary heat exchanger case toward the exhaust vent.

What is claimed is: 
     
         1 . A combustion apparatus comprising:
 a combustion portion configured to generate combustion gas;   a heat exchanger of latent heat recovery type configured to exchange heat with combustion gas generated by the combustion portion;   a heat exchanger case having an internal space and configured to accommodate the heat exchanger in the internal space;   an exhaust portion connected to a peripheral edge which is one of an upper peripheral edge and a lower peripheral edge of the heat exchanger case, having an exhaust vent configured to exhaust combustion gas which has passed through the heat exchanger case, and having a bottom surface including a first face parallel to the peripheral edge; and   a drainage water discharge port configured to discharge drainage water from the first face of the bottom surface,   the drainage water discharge port being provided, to avoid a region overlapping with the heat exchanger case from a point of view as seen in an up-down direction, in an exhaust path from the heat exchanger case toward the exhaust vent.   
     
     
         2 . The combustion apparatus according to  claim 1 , wherein
 the exhaust portion has a rising portion rising from the bottom surface, and   the drainage water discharge port is arranged at a corner formed by the bottom surface and the rising portion.   
     
     
         3 . The combustion apparatus according to  claim 2 , wherein
 the rising portion is composed of an outer wall of the exhaust portion.   
     
     
         4 . The combustion apparatus according to  claim 2 , wherein
 the rising portion is a plate member arranged in the exhaust path.   
     
     
         5 . The combustion apparatus according to  claim 1 , wherein
 the bottom surface of the exhaust portion includes a second face inclined relative to the peripheral edge of the heat exchanger case to have a down grade toward the first face.   
     
     
         6 . The combustion apparatus according to  claim 1 , wherein
 the drainage water discharge port is provided in a sidewall of the exhaust portion and opens laterally.   
     
     
         7 . The combustion apparatus according to  claim 6 , wherein
 the first face is provided with a guiding inclined face having a down grade toward the drainage water discharge port.