| 摘要 |
A flat wall type refrigerated and chilled open display case having a case opened at its upper region and an air circulation duct having a cold air curtain outlet and a cold air curtain inlet provided at the upper front side and upper rear side of the case so as to oppose to each other across the opened upper region of the case. A cooler associated with a refrigerator, as well as a blower, is disposed in the air circulation passage, so that, during the chilling operation, a cold air is blown out of the cold air curtain outlet toward the cold air curtain inlet to form a cold air curtain which covers the opened upper region of the case. According to the invention, the blower disposed in the air circulation duct is reversible and the display case further comprises a defrosting air duct which opens at its one end to the ambient air and at its other end at a position confronting the cold air curtain outlet, and an ambient air blower disposed in the defrosting air duct. In the defrosting operation, the blower in the air circulation duct is reversed and the ambient air blower is operated to forcibly feed the hot ambient air into the air circulation duct through the defrosting air duct and the cold air curtain outlet thereby to effect a defrosting on the cooler disposed in the air circulation duct. The air after the defrosting is discharged to form an air curtain covering the opened upper region of the case of effectively prevent the hot ambient air from coming into the case.
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