相比于单级压缩，两级压缩趋近于最省功的等温压缩，相当于一个顶两，从原理上，两级压缩比单级压缩节能12~17％。采用两级压缩主机，就是采用大小不同的两组螺杆转子，实现合理的压力分配，降低了每次压缩的压缩比。
Compared with single-stage compression, two-stage compression tends to be the most energy-saving isothermal compression, equivalent to one top two. In principle, two-stage compression saves 12-17% energy than single-stage compression. Using two-stage compressor is to use two groups of screw rotors of different sizes to achieve a reasonable pressure distribution and reduce the compression ratio of each compression.
低的压缩比还有两个特别的优 点：一个是减少了内泄漏，提高了容积效率；另一个是大大降低了轴承的负荷，提高了轴承寿命，延长了主机寿命。2.高端配置，彰显品质。
Low compression ratio has two special advantages: one is to reduce internal leakage and improve volume efficiency; the other is to greatly reduce the load of bearings, improve the life of bearings and extend the life of the main engine. 2. High-end configuration, highlighting quality.