| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily construct a further flexible and proper number control in a number control system using two or more compressors for supplying compressed air at a low cost. SOLUTION: In this number control system for compressors, a flow rate monitoring part 7 measures the flow rate per unit time of the compressed air as workload of compressors 1, 2 and 3, and a workload determination control part 10 determines the increasing and decreasing tendency of workload of the compressors 1, 2 and 3 from the change of the flow rates per unit time before and after a certain time. The workload determination control part 10 then transmits a control signal to compressor operation parts 14, 15 and 16 or valve operation parts 17, 18 and 19 according to the increasing and decreasing tendency to control the compressors 1, 2 and 3 or automatic opening and closing valves 11, 12 and 13.</p> |
