| 摘要 |
PURPOSE:To reduce the electric-power consumption of a compressor by determining the number of operation units of capacity adjustors and compressors in accordance with the variation amount of load wind obtaind from the pressure variation amount per hour of the pressure difference obtained through the comparison between the set value of discharge pressure and the actual value of discharge pressure. CONSTITUTION:The pressure signal (electric-current signal) of a pressure transmission passage 17 is converted to the voltage signal by an electric current-voltage converter 2. The actual value Poi of the discharge pressure which is converted to the voltage signal is compared with the pressure set value Ps set into a pressure setting device 3. A sample hold circuit 5 memorizes the pressure variation amount DELTAP at each sampling time. In a wind amount calculating circuit 6, the variation amount DELTAQL of the amount of load wind amount on the basis of the pressure variation amount DELTAP and the piping volume C set in a constant setting circuit 9. In a capacity adjusting increment and decrement calculating circuit 7, the necessary number of capacity adjustors 14 fitted with the amount DELTAQL of load wind is obtained, and an increment and decrement instruction is outputted. Further, in a compressor quantity increment and decrement calculating circuit 8, the necessary operation units of the compressors is obtained, and an increment and decrement instruction is outputted. Therefore, the speedy response for the variation of the amount of load wind is permitted.
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