Defroster for indirect-freezing refrigerator

Details Defroster for indirect-freezing refrigerator Defroster for indirect-freezing refrigerator

1995-09-14

1998-09-01

Tanner, Harry B.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62140, F25D 2102

Patent

active

057994986

ABSTRACT:
A defroster for an indirect-freezing refrigerator is disclosed including a fan motor for circulating freezing air; a light passing hole for engagingly rotating with the rotation axis of the fan motor; a photointerrupt light emitting portion for emitting light toward the light passing hole of the rotation means; a photointerrupt light receiving portion for outputting a corresponding period, whether the emitted light passes through the hole or not; a defrosting heater for removing frost formed; and a microcomputer for receiving a signal varying with the variation of rotation number from the rotation number measuring means, thereby controlling the defrosting heater.

REFERENCES:
patent: 4123792 (1978-10-01), Gephart et al.
patent: 4316365 (1982-02-01), Mueller et al.
patent: 4724678 (1988-02-01), Pohl

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