空气压缩机的选择主要依据气动系统的工作压力和流量。
The selection of air compressor is mainly based on the working pressure and flow of pneumatic system.
气源的工作压力应比气动系统中的最高工作压力高20%左右，因为要考虑供气管道的沿程损失和局部损失。如果系统中某些地方的工作压力要求较低，可以采用减压阀来供气。空气压缩机的额定排气压力分为低压（0.7~1.0MPa）、中压（1.0~10MPa）、高压（10~100MPa）和超高压（100MPa以上），可根据实际需求来选择。常见使用压力一般为0.7-1.25。结构示意首先按空压机的特性要求，选择空压机的类型。再根据气动系统所需要的工作压力和流量两个参数，确定空压机的输出压力pc和吸入流量qc，最终选取空压机的型号。
The working pressure of the air source should be about 20% higher than the maximum working pressure in the pneumatic system, because the loss along the way and local loss of the air supply pipeline should be considered. If the working pressure in some parts of the system is low, the pressure reducing valve can be used to supply air. The rated discharge pressure of air compressor is divided into low pressure (0.7-1.0mpa), medium pressure (1.0-10mpa), high pressure (10-100mpa) and ultra-high pressure (above 100MPa), which can be selected according to the actual demand. The common use pressure is generally 0.7-1.25. First, select the type of air compressor according to the characteristics of air compressor. According to the two parameters of working pressure and flow required by the pneumatic system, the output pressure PC and suction flow QC of the air compressor are determined, and the model of the air compressor is finally selected.