| 摘要 |
PURPOSE:To prevent reduction of heating rate and shorten the time necessary for heating liquid by installing two thermometers at the upper and the lower layer parts of a tank without setting a fixed temperature and driving a circulating pump when the temperature in the upper layer is higher than that of the lower layer. CONSTITUTION:When the voltage V1 of the detector S1 arranged in the upper liquid layer in a tank 1, namely the temperature of the upper layer liquid is higher, and the voltage V2 of the detector S2 arranged in the lower liquid layer in the tank, namely the liquid temperature in the lowr layer liquid is lower, thoe voltages are entered into a comparator CR, and H signal is transmitted from the comparator CR. Then, a transistor TR is turned ON, and a relay R is operated, and a circulating pump P is driven to recover the warm liquid heated by a heat exchanger 4 into the tank. Thus, even if the temperature is below a fixed temperature, when the liquid temperature in the upper part is higher than the liquid temperature in the lower layer part, the circulating pump P is driven and the warm liquid is recovered in the tank 1, so the temperature of the liquid can be raised in a short time with high efficiency. |
