| 摘要 |
PROBLEM TO BE SOLVED: To spread combustion air to the whole bottom surface of a liquid tank evenly by providing a heat chamber with a plurality of partition plates in a staggered state in a state of having connecting openings, partitioning the heat chamber into a combustion chamber and combustion air convection chambers, and providing the bottom wall of the heat chamber with an inclined surface with its downstream side higher than a burner. SOLUTION: The inside of a heat chamber 2 is vertically divided by an intermediate plate 2b and an inclined plate 13, and a hollow space thermally insulating layer 14 is formed at the lower part. Partition plates 6a-6c in a staggered state so as to have connecting openings 7 are provided over the intermediate plate 2b and the inclined plate 13 in the heat chamber 2 to partition the heat chamber 2 into a combustion chamber 8 and combustion air convection chambers 9a-9c. Temperature is lowered in the process of the zigzag flow of combustion air G to reduce the volume of the combustion air G. Here, the capacities of the combustion air convection chambers 9a-9c and the combustion chamber 8 are gradually reduced to the downstream side correspondingly to the reduction of volume of the combustion air G. In addition, combustion air lead-through plates 16 are provided to smooth the flow of the combustion air G.
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