| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger for hot water having a structure for improving the heat exchange ratio, without increasing cost, and without deteriorating workability. SOLUTION: This structure has a combustion chamber 2 having a water chamber 1 on the periphery in a cylindrical shape, a burner 3 faced in the combustion chamber 2 from a combustion chamber side wall 2a by penetrating through the water chamber 1, an exhaust gas chamber 4 adjacently arranged on a water chamber top plate 1a of the water chamber 1, and a large number of cylindrical smoke tubes 5 connected between a combustion chamber top plate 2b and the water chamber top plate 1a, and a resistance 6 is arranged inside the smoke tubes 5. The resistance 6 is constituted by superposing two plate-like bodies 6a of the same shape, and the respective plate-like bodies 6a have a flow passage resistance part 6c wholly bent in the same direction as an opening part 6b. Since the two plate-like bodies 6a are superposed in a vertically dislocated state of positioning one flow passage resistance part 6c between the other flow passage resistance part 6c, an arranging interval of the flow passage resistance part 6c can be shortened, and the heat exchange ratio can be improved by increasing a meandering frequency of combustion gas passing through into the smoke tubes 5. COPYRIGHT: (C)2008,JPO&INPIT
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