| 摘要 |
<p>OPEN TOP MULTIBAND REFRIGERATED DISPLAY CASE An open top refrigerated display case having mechanisms for establishing an inner refrigerated air band encircling the display portion of the case and an outer air band also encircling the display portion and being positioned outside of the inner air band. An inner air conduit passes around the side and bottom walls of the cabinet of the display case and has an outlet opening at one end of the opening in the top of the cabinet and an inlet opening at the other end of the top opening in the cabinet. A fan circulates air through this inner air conduit with the air leaving the oulet opening and being directed toward and received by the inlet opening of the conduit, thereby establishing an inner air band along with an inner air curtain across the opening in the top of the cabinet. An evaporator coil arranged within the inner air conduit serves to refrigerate the air passing along the inner air band during a refrigeration cycle of operation. An outer air conduit surrounds the inner air conduit within the cabinet and during a refrigeration cycle carries air which is cooler than ambient air, but unrefrigerated. A second fan is provided within this outer air conduit for circulating air through the conduit and establishing an outer air band and outer air curtain across the opening in the top of the cabinet. During a defrost cycle of operation, the evaporator coil is turned off and the direction of air flow through at least one of the inner or outer air conduits is reversed and unrefrigerated air is caused to pass through the inner air conduit, thereby serving to defrost that conduit.</p> |
