Refrigeration – With indicator or tester – Operatively correlated with automatic control
Patent
1977-09-23
1979-09-18
Braun, Leslie
Refrigeration
With indicator or tester
Operatively correlated with automatic control
62129, 62228, F25B 4900, G01K 1300, F25B 4104
Patent
active
041678583
ABSTRACT:
In the pipeline of a refrigerator system comprising a compressor, a condenser, an expansion valve and an evaporator, a thermistor adapted to serve as a detector for detecting the dryness of refrigerant is disposed so as to be immersed in the refrigerant at a position where the refrigerant is changed into a homogeneous gas-liquid mixture under the low refrigerant condition. The dryness of the refrigerant is detected by utilizing the fact that while the thermistor is cooled by the refrigerant when its quantity is normal, when its quantity is below normal the refrigerant is changed into a dry gas so that the thermistor is not cooled by the refrigerant and its resistance value is changed. Also a control circuit is provided which is responsive to the signal from the detector, whereby when the dryness of the refrigerant reaches a predetermined value, a signal is generated to render the compressor inoperative. This ensures accurate detection of the shortage of refrigerant and has the effect of preventing failure of the compressor due to the compressor being operated with the insufficient refrigerant.
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Kojima Yasuhumi
Nabeta Teiichi
Braun Leslie
Nippondenso Co. Ltd.
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