| 摘要 |
<p>A double wall casing structure of the present invention comprises an inner casing 2 for housing heat generating equipment 1 and an outer casing 3 surrounding the inner casing 2. A plurality of fans 5 are provided in an air layer 4 defined between the inner and outer casings, for steering air in the air layer. At least one valve 6 of bimetal is provided in the outer casing 3. The valve is adapted to be automatically closed/opened according to temperature thereof. When an internal temperature of the double wall casing structure is within a predetermined temperature range, the fans 5 are inoperable and the bimetal valve 6 is closed to seal the casing structure. When the fans 5 are operated, air in the air layer 4 is under forced convection and outward heat radiation is promoted. In this state, when the bimetal valve 6 is further opened, the air layer 4 becomes in communication with external air and the inner casing 2 becomes in contact with external air. Therefore, outward heat radiation is further promoted. <IMAGE></p> |
