Means for detecting the accumulation of frost in a low temperatu

Details Means for detecting the accumulation of frost in a low temperatu Means for detecting the accumulation of frost in a low temperatu

1980-09-02

1982-09-14

Makay, Albert J.

Refrigeration

Automatic control

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

62234, F25D 2102

Patent

active

043488692

ABSTRACT:
The resonant frequency of an electroacoustic transducer controls the frequency of an oscillating circuit while the transducer vibratile element remains unobstructed. An extended small area portion of the vibratile element is mounted at a fixed distance from the sub-freezing surface of a freezer compartment on which a specified layer of frost is to be detected. When the frost layer builds up to the specified thickness it makes contact with the extended vibratile tip portion of the vibratile element and inhibits the vibration of the vibratile element thus causing the oscillator circuit to stop oscillating. The detected change in the circuit condition is used to initiate the defrost cycle.

REFERENCES:
patent: 4176524 (1979-12-01), Kamiyama et al.
patent: 4206612 (1980-06-01), Gardner

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