초록 ▼

A refrigerated display case, of the reach-in type having a door normally closing a customer access opening, utilizes ambient air for defrost purposes by channeling it through an inlet conduit at the bottom of the case. The air is introduced into the normal air circulation pattern that obtains during

A refrigerated display case, of the reach-in type having a door normally closing a customer access opening, utilizes ambient air for defrost purposes by channeling it through an inlet conduit at the bottom of the case. The air is introduced into the normal air circulation pattern that obtains during the refrigerating cycle of the case, at the intake sides of the otherwise conventional primary circulating fan and its adjacent evaporator coil. The arrangement avoids reversal of the normal air circulation pattern and maintains a small but noticeable air flow, during a defrost cycle, through the product display area and along the inside of the glass door surface. The inflow of ambient defrost air is directed into the case through a defrost air inlet conduit having at its outlet end a continuously open air supply port, which opens into the primary air duct to provide for said introduction of defrost air into the normal air pattern. Common to different forms of the invention are defrost air inlet and exhaust dampers that are normally closed during refrigeration cycles, but open together and remain open throughout each defrost cycle of the case.

대표청구항 ▼

In a refrigerated display case of the air defrost type having refrigerating and defrost cycles, a display space, an air duct extending at least partially thereabout, a refrigerating coil mounted in the duct, and a primary fan also mounted in the duct and adapted for circulating air therethrough abou

In a refrigerated display case of the air defrost type having refrigerating and defrost cycles, a display space, an air duct extending at least partially thereabout, a refrigerating coil mounted in the duct, and a primary fan also mounted in the duct and adapted for circulating air therethrough about the display space in the same direction during both the refrigeration and the defrost cycles thereof, the improvement comprising: (a) a defrost air inlet conduit separate from and extending alongside said duct and having an inlet in communication with the ambient atmosphere and a defrost air supply port opening into the primary air duct; (b) an inlet damper for admitting ambient defrost air through said inlet into the conduit for flow therethrough and through the defrost air supply port into the duct and thereafter through the coil during the defrost cycles of the case; and (c) an air exhaust damper for exhausting from the duct, into the ambient atmosphere, the air that has passed through the coil during said defrost cycles.