| 摘要 |
PROBLEM TO BE SOLVED: To reduce deterioration of a cooling performance caused by dust or the like as much as possible, by providing in a vent duct a filter device with an electric fan, which serves to catch dust and dirt sucked into the vent duct through a perforated floor plate and a hurdle plate from a refrigerated chamber. SOLUTION: A perforated floor plate 7 is placed on a top surface of a hurdle plate 6, whereby suction of cold air from a floor surface is uniformly effected over an entire area of the floor surface and passage of cold air is made uniform anywhere. Since dust or the like falls on the floor surface of a refrigerated chamber when articles are carried in and out by means of a truck, a filter device 16 is installed in a vent duct 9. Even if a tilter is clogged, a return air bypasses the filter 16a to be sucked through a free flow passage by a fan 12b for a cooler, so that the fan 12b for the cooler is not increased in resistance and a smooth air flow is maintained. Accordingly, it is possible to maintain a refrigerating capacity. |
