| 摘要 |
PURPOSE:To extend the interval of defrosting by a method wherein a bypass passage, communicating a sucking place, in which a cold air suction port is opened, with the upstream side of the flow of cold air in an evaporator, is provided and an additional bypath, communicating the vicinity of the sucking plate with the downstream side of the flow of cold air in the evaporator, is provided. CONSTITUTION:When cooling operation is effected, cold air flows into a sucking part 14 since the opening 21a of the lower end of an additional bypass duct 21 is smaller than the opening of first and second bypass ducts 9, 10 and, therefore, frosting is caused in the initial period of the cooling operation at the lower part of an evaporator 5 provided with a cold air suction port 5a, then, frosting is caused at the front and rear surfaces of the lower part of the evaporator 5 through the first and second bypass ducts 9, 10. When the cold air suction port 5a side and the front and rear surface sides at the lower part of the evaporator 5 are brought into clogging condition perfectly, cold circulating air circulates to the upper part of the evaporator 5 through the bypass additional duct 21 whereby cooling effect can be continued successively. Accordingly, the frosting is spread all over the evaporator 5 uniformly and the frosting area is enlarged whereby clogging time can be extended and the interval of defrosting can be elongated thereby reducing power consumption. |
