螺杆式压缩机的实际循环,由吸气、压缩、排气三个阶段组成,它是以气体压力和气腔容积之间的关系特性P=f（Vnn）的示功图（图 1）来表示。螺杆式压缩机的循环期,首先决定于工作机构（螺杆）的尺寸和被压缩气体的物理常数。干式和注油式螺杆式压缩机的循环期为2 × 10～（-3）～40 × 10～（-3）秒。我们所探讨的螺杆式压缩机的循环期在2.6 × 10～（-3）～7.5 × 10～（-3）之间变化。这时,由于频率高（130～370赫芝）, The actual cycle of a screw compressor consists of three stages: suction, compression and exhaust. It is expressed as a graph of the relationship between the gas pressure and the volume of the gas chamber, P = f (Vnn) (Figure 1) . The cycle of a screw compressor depends primarily on the size of the working mechanism (screw) and on the physical constants of the compressed gas. Dry and oil-injected screw compressor cycle of 2 × 10 ~ (-3) ~ 40 × 10 ~ (-3) seconds. The cycle of the screw compressor we discussed is between 2.6 × 10 ~ (-3) and 7.5 × 10 ~ (-3). At this time, due to the high frequency (130 ~ 370 Hertz)