| 摘要 |
PURPOSE:To control the compressor so as to be capable of preventing the hunting of control by a method wherein the parallel operation of a plurality of compressors is effected under synchronizing the compressor in a compressor loop, which is expected to be stopped, with a capacity regulating loop. CONSTITUTION:The compressor control loop is split into two loops of the loop of capacity regulators V1, V2 for the compressor No.1, whose operating time is longest among the loops and which is expected to be stopped, and the loop of capacity regulators V1, V2 of the compressors No.2, No.3 excluding the loop of the compressor No.1. In accordance with the variation of a load condition, the loop of the compressor No.1, expected to be stopped, is unloaded preferentially while the loops of the compressors No.2, No.3, which are not expected to be stopped, are controlled so as to be on-loaded on the contrary. Operating sequence is from the capacity regulator V1 of the compressor No.2 to the regulator V2 of the same compressor, subsequently from V1 of No.3 to V2 of the same and unloading is controlled from the regulators V1, V2, which are on-loaded for the longest time, while the on-loading is controlled from the regulators V1, V2, which are unloaded for the longest time, sequentially. |
