空气经过一级压缩后，通过强化喷油冷却，降低二级吸气温度，空气进行二级压缩，降低压缩功比。

两级压缩采用等压比来设定级间压力，故每级压缩比都要比单级压缩比降低很多，转子之间的回流泄漏量大大降低了，容积效率和绝热效率得到了大大提高，相应的提升了压缩的产气量。在相同的功率下两级压缩比单级压缩产气量高35%，可以实现多达35%以上的节能效果。

After the air is compressed in the first stage, it is cooled by enhanced oil injection to reduce the temperature of the second stage suction, and the air is compressed in the second stage to reduce the compression work ratio.

Two-stage compression uses equal pressure ratio to set the inter-stage pressure, so thecompression ratio of each stage is much lower than the single-stage compression ratio, the retumleakage between the rotors is greatly reduced, and the volumetric efficiency and adiabaticefficiency are greatly improved. Correspondingly, the compressed gas production is the same power, the gas output of two-stage compression is 35% higher than that ofsingle-stage compression, which can achieve up to 35% energy saving effect.