| 摘要 |
PROBLEM TO BE SOLVED: To suppress the outflow of warm air generated in defrosting operation to the outside. SOLUTION: A number of air outlets 18 are formed in a fan cover 16 arranged on a casing 12. A damper 22 capable of opening and closing the air outlet group of the upper stage is tiltably arranged on the fan cover 16 through hinges 24 and 24. The damper 22 forms a prescribed clearance between a shielding part 22a and the fan cover 16 in a closed state where the air outlet group is covered with the shielding part 22a. Namely, when the damper 22 is suspended by the dead weight, an opening 25 capable of introducing the warm air raised along the front surface of the fan cover 16 in defrosting operation between both the members is formed between the lower end of the shielding part 22a and the fan cover 16. The warm air is returned into the casing 12 through the air outlet group. COPYRIGHT: (C)2004,JPO
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