Freezing prevention system for refrigeration device and air...

Details Freezing prevention system for refrigeration device and air... Freezing prevention system for refrigeration device and air...

2006-12-19

2006-12-19

Tyler, Cheryl (Department: 3744)

Refrigeration

Automatic control

Time or program actuator

C062S227000, C062S156000, C062S158000

Reexamination Certificate

active

07150158

ABSTRACT:
A freezing prevention system for a refrigeration device includes a freezing-prevention temperature sensor for detecting a refrigerant temperature in a refrigerant evaporator, and a control unit for controlling operation of a refrigerant compressor based on the detected refrigerant temperature. The control unit includes a calculating means for calculating an integral value of the detected refrigerant temperature integrating with respect to a passed time after the detected refrigerant temperature becomes equal to or lower than 0° C. When the integral value becomes equal to or larger than a predetermined value, the control unit stops the operation of the refrigerant compressor. Accordingly, the freezing prevention system can accurately perform a freezing prevention control while its production cost can be reduced.

REFERENCES:
patent: 170707 (1875-12-01), Shibata et al.
patent: 6330909 (2001-12-01), Takahashi et al.
patent: 6427465 (2002-08-01), Bednarchik et al.
patent: 2000-258001 (2000-09-01), None
patent: 2003-65639 (2003-03-01), None

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