| 摘要 |
<p>PURPOSE:To make it possible to rapidly obtain hot water by providing a shape memory alloy fixed at its lever end to the bottom part of a vessel and expanding and contracting upward and downward, and a flexible hose for sucking and returning connected to the upper part of the shape memory alloy, one end of said hose being used as a heating suction port and a heating return port. CONSTITUTION:A shape memory alloy 7 contracts in a hot water layer A and expand in a water B of a temperature less than a set temperature. Any of a heating suction port 12 and a heating return port 13 is positioned in the vicinity of a broken line at the lower end of the hot water layer A. Accordingly, since the temperature of water sucked up through the heating suction port 12 is close to a set value, when water is heated by an external heating device 4, the temperature of water easily reaches more than the set value, and returns from the heating return port 13 opened in hot water to the vessel, the temperature of the hot water layer is further raised to increase the thickness of the hot water layer. That is, the broken line is lowered downward. Further, when the heater is not used for a long period of time the shape memory alloy 7 extends to the upper end, the suction port 12 and the return port 13 are raised to a height close to the takeout port 3, and hence water in the vicinity of the takeout port 3 rapidly becomes hot water.</p> |
