| 摘要 |
PROBLEM TO BE SOLVED: To provide a frosting detecting device to accurately detect a frosted state throughout the whole of an evaporator. SOLUTION: A frosting detecting device for a refrigerator comprises a refrigerator consisting of a compressor, a condenser, an expansion valve, an evaporator 2, and a refrigerant; a refrigerator for cooling through circulation of the refrigerant and evaporation of it by the evaporator 2; and ultrasonic sensors 31, 31A, 32A situated opposite to each other at the two end part of the evaporator 2 and making a pair. The evaporator k2 comprises a refrigerant line 21 connected to a piping and vaporizing a refrigerant 19, sand a plurality of fins 2A-2M disposed in the refrigerant line 21 and absorbing heat from the circumference of the evaporator 2 and transferring heat to the refrigerant in the refrigerant line 21. A plurality of fins 2A-2M have a through-hole linearly extending through and constitute a propagation route for ultrasonic signals 3a and 3b from the ultrasonic sensors 31 making a pair through the through-hole.
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