Refrigeration apparatus
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United States of America Patent
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Oct 5, 2021
Grant Date -
N/A
app pub date -
Dec 21, 2020
filing date -
Jun 22, 2018
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A refrigeration apparatus includes a compressor connected to a refrigerant circuit, and a bearing monitor. The compressor includes a compression mechanism, an electric motor, a drive shaft, and a plain bearing that supports a journal portion of the drive shaft. The bearing monitor performs an abnormal-state operation to cope with poor lubrication on the plain bearing if an abnormal state condition is satisfied. The abnormal state condition is a condition indicating that a rate of change of current exceeds a first reference value. The rate of change of current is an amount of change in a driving current usable to drive the compressor per unit time. The journal portion of the drive shaft has a surface roughness of at least 0.05 μm.
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