Defroster for the evaporator of a refrigerator

Details Defroster for the evaporator of a refrigerator Defroster for the evaporator of a refrigerator

1981-01-05

1982-08-24

Makay, Albert J.

Refrigeration

Automatic control

By accumulation on freezing surface, e.g., ice

62156, F25D 2102, F25D 2106

Patent

active

043454410

ABSTRACT:
The invention relates to defroster control apparatus for the evaporator of a refrigerator. A frost sensor for measuring temperature is mounted a predetermined distance from a surface of the evaporator which corresponds to the permissible thickness of frost layer. Control apparatus including a comparator circuit initiates defrosting when the frost sensor temperature falls below a reference temperature. In this construction the frost layer grows in the direction of the frost sensor which is swept by the surrounding air. During each operating cycle the frost sensor initially measures a temperature approximating to the surrounding temperature. As the frost progressively increases, this temperature falls because the air circulation in the vicinity of the frost sensor is progressively more influenced as the thickness of the frost layer increases. In the extreme case, the frost sensor can come into contact with the frost layer. Depending on the choice of reference temperature, defrosting can therefore be initiated when the frost layer screens the frost sensor to a predetermined degree from the surrounding air or has made contact with the frost sensor.

REFERENCES:
patent: 2075437 (1937-03-01), Hainsworth
patent: 2117104 (1938-05-01), Rorison
patent: 2669848 (1954-01-01), Fujii
patent: 2744389 (1956-05-01), Raney

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