| 摘要 |
An improved defroster arrangement for a known refrigerating showcase which is provided with an inside duct for circulating a refrigerated air flow to refrigerate the interior of the showcase and an outside duct for circulating a low temperature air flow to prevent a temperature rise of the refrigerated air flow. The improvements exist in the provision of a communication passage between the inside and outside ducts, and a gate for opening and closing the communication passage. During defrosting, the gate is actuated to communicate the inside and outside ducts with each other through the communication passage and also to block the path through the outside duct between the communication passage and an intake port. In this manner only the air circulating through the inside duct upstream of the gate and through both the inside and outside ducts downstream of the gate is driven by means of fans disposed within the inside and outside ducts, respectively. Also ambient air may be jointly sucked into the inside duct upstream of the gate means. |
