| 摘要 |
PROBLEM TO BE SOLVED: To provide a system for controlling the number of compressors, capable of producing a compressed air in a manner quickly following a use load of the compressed air with a simple structure.SOLUTION: A system for controlling the number of compressors comprises: a plurality of compressor 2; a receiver tank 3 to which compressed air from the compressor 2 is supplied and which feeds the compressed air to a compressed air using apparatus; a pressure sensor 4 installed on the receiver tank 3; and an operating number controller 5 changing the number of operating compressors 2 on the basis of a detection pressure of the pressure sensor 4. An operating number reducing pressure as a boundary value whether to reduce the number of operating compressors by the operating number controller 5 is set to be lower as the number of operating compressors is larger. Each compressor 2 is subjected to capacity control so that a discharge pressure is maintained between an upper limit pressure and a lower limit pressure. The operating number controller 5, in which the upper limit pressure and the lower limit pressure of the compressor 2 are input as set values in advance, performs a control by determining the operating number reducing pressure C on the basis of the set values of the operating compressors 2. |
