| 摘要 |
PROBLEM TO BE SOLVED: To quickly remove clogging of a capillary tube. SOLUTION: A heater 20 is provided in proximity to or in contact with the capillary tube 14. Temperature sensors 21 and 22 detecting the temperature of a refrigerant are provided respectively on the inlet side and outlet side of an evaporator 15. When clogging occurs in the capillary tube 14, the amount of flow of the refrigerant to the evaporator 15 side decreases and consequently the degree of superheat, i.e., the temperature difference between the inlet and the outlet of the evaporator 15, becomes large. In the course of operation of a refrigerating circuit 10, the temperatures on the inlet side and the outlet side of the evaporator 15 are detected and the difference between them is computed. When this temperature difference is a prescribed value or above, the capillary tube 14 is regarded as clogged and the heater 20 is made to heat by a signal from a heater drive control part 23 so as to heat the capillary tube 14. Thereby a dissolved substance being deposited is re-dissolved in the refrigerant or the like and made to flow to the evaporator 15 side together with the refrigerant, thus clogging being removed. |
