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美国英格索尔——兰德公司于1963年开始研究、并在六十年代后期转入工业性生产的《Centac》离心式空气压缩机组,其结构特点是;由电动机直接带动的1个大齿轮驱动4个小齿轮（沿大齿轮周向均布）,从而使分属于4个级的4个叶轮（后弯型）都可以在各自的最佳转速下运行;同时,机组为“全封闭”结构,增速箱、叶轮、扩压器、中间冷却器（共3个）及后冷却器、湿气分离器都在同一机体之内。因此,它具有结构非常紧凑、体积小、重量轻、运转较可靠、使用与维修较方便等优点。图1示出了典型的《Centac》4级离心式
The study by Ingersoll Rand, a research company started in 1963 and was transferred to industrial production Centac Centrifugal Air Compressor Unit in the late 1960s, is characterized by a large direct drive of the motor The gear drives four pinions (distributed evenly along the circumference of the gear) so that all four impellers (back-bent) belonging to four stages can operate at their optimum speed. At the same time, the unit is “fully enclosed” , Gearbox, impeller, diffuser, intercooler (3 in total) and aftercooler, moisture separator are in the same body. Therefore, it has a very compact structure, small size, light weight, more reliable operation, use and maintenance more convenient and so on. Figure 1 shows a typical “Centac” 4-stage centrifugal