Wide island air defrost refrigerated display case having a defro

Refrigeration – Display type – With air controlling or directing means

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Details

62 82, A47F 304, F25D 2112

Patent

active

044831536

ABSTRACT:
A wide island, open top refrigerated display case of the air defrost type has a vertical, hollow partition extending centrally and longitudinally of the case. The partition functions, during defrost cycles only, as an air passage through which the flow of defrost air is induced by operation of a defrost fan mounted in a hollow sill extending along the top of the partition. During refrigeration cycles, the fan is idle and there is no air flow within the partition, so that it forms a hollow dead air space operative to insulate from one another the product wells separated by the partition, a feature of particular importance when one well is refrigerated to a temperature different from the other. Various configurations are disclosed, in some of which the air is forced downwardly within the center flue or passage during defrost, while in others the air is drawn upwardly through the defrost passage. In some configurations, the primary fan or fans are operated in a normal forward direction during defrost, while in others they are reversed or are turned off.

REFERENCES:
patent: 3850003 (1974-11-01), Beckwith et al.
patent: 4182130 (1980-01-01), Ljung
patent: 4267706 (1981-05-01), Abraham
patent: 4304098 (1981-12-01), Rydahl
patent: 4314457 (1982-02-01), Ibrahim
patent: 4320631 (1982-03-01), Vana
patent: 4337626 (1982-07-01), Ibrahim

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