| 摘要 |
PROBLEM TO BE SOLVED: To provide a preheating device of a compressor capable of heating a lubrication oil efficiently with small power.SOLUTION: A preheating device 50 of a compressor includes: a capacitance oil level sensor 46 provided in the compressor used for a refrigeration cycle, and for detecting an oil level of a lubrication oil in the compressor; and a power supply part 45 for applying a high frequency voltage to the oil level sensor 46. Also, the high frequency voltage is applied while the compressor is stopped, and an oscillation circuit is used for generating a clock signal in a control part 41 for controlling the compressor, as the power supply part 45. Furthermore, a switching part 51 is provided for, according to a predetermined preheating condition, connecting/disconnecting the application of the high frequency voltage to the oil level sensor 46 from the oscillator circuit 45.SELECTED DRAWING: Figure 3 |
