Frost detecting device
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United States of America Patent
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-
Jun 4, 1996
Grant Date -
N/A
app pub date -
Apr 25, 1995
filing date -
Sep 19, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A frost detecting device for detecting adhesion of the frost, a slit-like opening is formed on the inside of a container with a hollow portion, a thermally sensitive element such as a thermistor is arranged on the inside of the hollow portion, leads of the thermally sensitive element are mounting to exterior through a penetrating hole provided for a metallic plate, the leads are fixed to the metallic plate, the slit-like opening is blocked by adhesion of the frost. An inside of the container is interrupted from ambient atmosphere, a temperature on the inside of the container drops, a quantity of adhesion of the frost can be detected by detecting difference in temperature between non frost state and adhesion of the frost state. Further two containers are provided. The respective thermally sensitive elements are arranged at each of two containers one of which is provided with openings, the other of which is provided with a thermally sensitive element for compensating temperature in such a manner that the thermally sensitive element is hermetically fixed. Accordingly, it's possible to heighten detecting accuracy of adhesion of the frost.
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