초록 ▼

A refrigerated display cabinet having air outlet ports in the top wall thereof for expelling ambient defrost air to the outside of the cabinet so that the air will not reenter the product display space. A baffle plate provided for blocking the passage of ambient defrost air into the top portion of t

A refrigerated display cabinet having air outlet ports in the top wall thereof for expelling ambient defrost air to the outside of the cabinet so that the air will not reenter the product display space. A baffle plate provided for blocking the passage of ambient defrost air into the top portion of the refrigerated air conduit during the defrost cycle from which it could flow into the product display space. A protective ambient air band is established across the access opening during the defrost cycle during which the flow of ambient defrost air is prevented from entering the internal cabinet product display space. The gate covering the air outlet port is used to mechanically control the closure of the baffle plate blocking the flow of ambient defrost air into the internal product display space. The operation of the display cabinet permits ambient air flow in the primary air conduit in the same direction during both the refrigeration and defrost cycles of operation so that only unidirectional fan motors are required in the cabinet.

대표청구항 ▼

A method of operating an open front display cabinet having top, bottom, side and end walls defining a display space and having apertures in at least two walls thereof for communicating ambient outside air into said cabinet, the aperture means comprising an access opening for permitting products to b

A method of operating an open front display cabinet having top, bottom, side and end walls defining a display space and having apertures in at least two walls thereof for communicating ambient outside air into said cabinet, the aperture means comprising an access opening for permitting products to be moved into and out of said display space and at least one air outlet port, at least one air conduit positioned about the display space for enabling circulation of a primary air band and the air conduit having an outlet opening and an inlet opening at opposite ends thereof so that air leaving the outlet opening is directed across the access opening and received into the inlet opening, an air moving means for propelling said primary air band through the air conduit during a refrigeration cycle and for propelling ambient air through the air conduit during a defrost cycle, and refrigeration means arranged within the air conduit for selective operation in a refrigeration and in a defrost cycle, gate means selectively operative to close the air outlet port during the refrigeration cycle of operation and for opening the outlet port during a defrost cycle, and a baffle plate for blocking the passage of air in the air conduit during a defrost cycle of operation; said method comprising the steps of: circulating a refrigerated primary air band in the air conduit during a refrigeration cycle of operation in which the gate means is closed over the air outlet port, terminating operation of the refrigeration means to initiate the defrost cycle of operation, thereafter opening the gate means and causing the baffle plate to move into blocking position within the air conduit, and propelling air within the air conduit across the refrigeration means, expelling the air through the air outlet port in order to defrost the refrigeration means, at the termination of the defrost cycle of operation, closing the gate means over the air outlet port and commencing operation of the refrigeration means, and circulating the air band in the same direction in both the refrigeration and the defrost cycles of operation.