G - Physics
08
B
340/139, 349/35
G08B 21/00 (2006.01) F25D 21/02 (2006.01) G01B 17/02 (2006.01) G01W 1/14 (2006.01)
Patent
CA 1090441
Abstract of the Disclosure The specification discloses a frost detector which comprises a piezoelectric element secured onto a metal dis- phragm inside an air-tight space formed by the diaphragm, a base and a bellows which resiliently connects the diaphragm and the base in an air-tight manner. The base is then secured to a fin of a heat exchanger and the piezoelectric element is connected to an oscillation circuit and an oscillation detection circuit. The resonance frequency and impedence characteristics of the piezoelectric element are changed as a layer of frost grows on the outside face of the diaphragm, and the frosting is detected through a change or dampening of the oscillation. When this occurs, an output signal is generated by the oscilla- tion detection circuit, and defrosting means is operated in response to the signal. A detector is thus provided which actually measures the amount of frost formed on the heat exchanger, and this improves the performance of a cooler or freezer fitted with the detectors.
290106
Kamiyama Toshibumi
Miyamoto Kunito
Kirby Eades Gale Baker
Matsushita Electric Industrial Co. Ltd.
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