| 摘要 |
PURPOSE:To cool a mold down to its proper temperature by exchanging the heat of the cooling liquid in a pipe by means of an evaporator by a method wherein the rotational frequency of a compressor is changed by control signals, which are sent to the compressor so as to compare the temperature of the mold with the set temperature every unit time in order to bring the difference between the two temperatures just mentioned above. CONSTITUTION:A temperature sensor 23 is directly mounted onto a mold 22A in order to detect the temperatures of the mold 22A and of a mold 22B for sending detection signals to a controller 21. The controller 21 points the proper rotational frequency on the basis of the temperatures of the molds to a compressor 18. Further, temperature sensors 29 and 30, which detect the temperatures of cooling liquid 24, are respectively provided on the inlet side and outlet side of a mold cooling circuit in order for the controller 21 to actuate a heater 25 on the basis of the signals of the sensor 29 and 30. The heater 25 heats cooling water 24 up to a temperature suitable for cooling by the actuating signal, which is sent from the controller 21 to the heater 25. The set temperature depends on the kind of the molds 22A and 22B and the quantity of the cooling water 24 and changes within the range of about 20-90 deg.C. |
