| 摘要 |
A refrigerated display case having a display section within a cabinet and movable door covering the access opening to such display section. The cabinet has top, bottom, rear and side walls with an opening in its front, which opening is covered by the door. An air conduit extends along the top, bottom and rear walls of the cabinet. The air conduit has an outlet opening and an inlet opening at opposing ends thereof with the openings being in alignment so that air leaving the outlet opening will be directed towards and received by the inlet opening thereby forming an air curtain across the front opening of the cabinet along the path inside the door. During a refrigeration cycle of operation of the display case, refrigerated air is circulated through the air conduit and a refrigeration mechanism arranged within the conduit by a positive pressure air flow so as to establish a refrigerated air band and a refrigerated air curtain across the front opening in the cabinet. During a defrost cycle of operation, the refrigeration mechanism is turned off and ambient air is circulated through a substantial portion of the air conduit. Such ambient air serves to defrost the refrigeration mechanism and the interior of the air conduit. Most of the ambient air is expelled from the display case after passing through the refrigeration mechanism so that only a small amount of the ambient air flows into the display section of the display case.
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