| 摘要 |
PURPOSE:To prevent hunting by allowing the capacity of a refrigerator to correspond to a load by controlling the number of revolution of a compressor and controlling the temperature of supplied oil with high accuracy, reducing the frequency in start and stop, so that the temperature difference between the temperature of a machine body and the temperature of the environment of the machine becomes a prescribed value. CONSTITUTION:The temperature difference between the temperature of supplied oil and the temperature of a machine body is calculated and compared with a prescribed value, and when the result value is larger than a prescribed value, said temperature difference is further compared with the value higher by 0.5 deg.C than the prescribed value, and when the temperature difference is lower than the prescribed value, it is judged that the temperature difference is larger than the prescribed value, and 45Hz is selected and output into an inverter 20, and then returned. When the temperature difference is lower than the prescribed value, the temperature difference is compared with the value lower by 0.5 deg.C than the prescribed value, and if the temperature difference is larger, it is judged that a compressor 15 is to be operated with the less capacity, and 35Hz is selected and output into the inverter 20, and then returned. Therefore the inverter 20 is controlled so that the temperature difference between the temperature of supplied oil and the temperature of the machine body is kept at a prescribed value, and hunting is prevented. |
