PURPOSE: To miniaturize the titled heat exchanger and to reduce sharply the manufacturing cost thereof by a method wherein a fluid passage is formed on the side of an outer pipe in which the velocity of the fluid decreases, by utilizing the inner and the outer side of a double pipe coil.
CONSTITUTION: In a doulbe pipe type heat exchanger adopted to perform a heat exchange operation effectively between two kinds of fluids of different heat transfer properties, the double pipe coil 10 is arranged between the inner tank 11 and the outer tank 12 of an oil tank 1. The oil from a machine tool is returned to the oil tank 1 where it is first cooled by the outer surface of the outer pipe of the coil 10 as it passes through the fluid passage between the inner tank 11 and the outer tank 12 and is sucked by a circulation pump 2 from inside of the inner tank 11. Next, the oil passes through the inner pipe of the coil 10 so that it is cooled further and is then supplied under pressure to the machine tool 3. With the above structure, the heat exchange operation is performed without reducing the heat transfer capacity at the outside of the outer pipe of the coil 10. Accordingly, the heat exchanger can be miniaturized and the manufacturing cost thereof can be reduced sharply.
FUKUSHIRO TAKESHI
FUTAWATARI HAJIME
