| 摘要 |
PROBLEM TO BE SOLVED: To prevent or reduce damage by thermal fatigue by arranging a cooling jacket in which a cooling medium is confined, in the vicinity of a part apt to be damaged by thermal fatigue. SOLUTION: Fluid 51 flows in a water supply nozzle 50, and a thermal fatigue damage causing part 52 having fear of causing thermal fatigue damage exists on an inside surface of the water supply nozzle 50 by a temperature change in the fluid 51. A cooling jacket 60 exists in an outer periphersal part of the water supply nozzle 50, and a refrigerant 7 is confined by a cooling jacket cover 53. Thermal fatigue damage of the thermal fatigue damage causing part 52 is prevented or reduced by a cooling effect of the refrigerant 7. In this case, when a temperature of the refrigerant 7 measured by a temperature sensor 15 rises, a circulating pump 13 and a cooler 12 are operated by a command of a control device 17, and the refrigerant 7 flows in a refrigerant circulting loop 9. Therefore, a cooling effect of the refrigerant 7 is recovered, and thermal fatigue damage can be intermittently prevented or reduced. |
