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    • 4. 发明专利
    • LIQUID HEATER
    • JP2001275852A
    • 2001-10-09
    • JP2000091912
    • 2000-03-29
    • EIKEN IND CO LTDTOHO GAS KK
    • FURUHASHI TOSHIOMURASE KAZUJIOSHIDA SHUNICHI
    • A47J27/14A47J37/12
    • PROBLEM TO BE SOLVED: To provide a liquid heater that can improve the heat exchanger effectiveness of exhaust pipes arranged in a liquid tank and ensure sufficient thermal efficiency of the device itself, and can decrease the exhaust temperature. SOLUTION: This liquid heater is so designed that a combustion chamber provided with a burner is delimited on one side under a liquid tank, that cylindrical exhaust pipes with sidewalls substantially perpendicular at least to the transverse are arranged in a substantially parallel relation in the liquid tank from one to the other side thereof, and that combustion gas in the combustion chamber is passed through the exhaust pipes to heat liquid in the liquid tank. Each internal sidewall surface of each exhaust pipe is fixedly equipped with fins each with slits substantially horizontally perpendicular to the longitudinal axis, and each fin has a combustion gas guide means for directing down the combustion gas flowing in the exhaust pipe as it flows downstream. The combustion gas guide means is formed by fin sidewall portions, for example, projecting substantially horizontally and inclined down in the downstream direction.