| 摘要 |
PURPOSE:To make temperature control ranging from low temperature to high temperature possible by automatically changing over from a refrigerating device to a cooling device other than the refrigerating device and vice versa by a method wherein a heat exchanger is jointly provided between a change-over mechanism and branched return flow paths and the refrigerating device is stopped and, at the same time, the change-over mechanism is changed over to the state that cooling liquid is sent back through the heat exchanger, when the temperature of the cooling liquid is higher than the set temperature. CONSTITUTION:A change-over mechanism 18 is provided in a flow path, which runs from a mold 8 to branched return flow paths 14a and 14b. When cooling liquid flows in the direction indicated with the arrow B, it divides from the change-over mechanism 18 and flows to a heat exchanger 19. When the temperature of the cooling liquid is higher than the set temperature, an automatic control device TH puts the contacts of a CM off and those of a V on, resulting in stopping a refrigerating device and, at the same time, in changing-over the change-over mechanism 18 to the state that the cooling liquid is sent back through the heat exchanger 19. By properly setting the set temperature of the automatic control device, the change-over is automatically done to the use of the heat exchanger or to another cooling means, when the temperature of the return cooling liquid is so high as to put a protector in actuation. |
