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活塞式压缩机在工作中都希望排气量最大（电能消耗一定的情况下）,现拟就影响活塞式压缩机排气量的因素加以探讨。借此我们可以企图努力去增加排气量,以满足我们工作的需要。 1.吸气管长度的影响 活塞式压缩机吸气管中气流波动对于排气量影响甚大。吸气管中的气流波动使吸气系统产生振动,当吸气系统的自振频率与气流引起的扰动频率重合时影响最显著,此时产生共振使压缩机的排气量增加至最大。产生共振时,吸气管长度等于共振长度。即L_吸=L_共。但共振长度目前无精确的计算公式（计算数值往往偏大）。而生产上一般都希望吸气管尽量短些,由经验数据可知,吸气管长度一般为4-6米为宜。
Piston compressor in the work of all hope that the largest displacement (the case of a certain amount of energy consumption), is intended to affect the displacement of piston compressor factors to be explored. By this we can try to increase the exhaust volume to meet the needs of our work. 1. The effect of the length of the suction pipe Air flow in the piston compressor suction pipe fluctuations have a significant impact on the displacement. The fluctuation of the air flow in the suction pipe vibrates the suction system. When the self-vibration frequency of the suction system coincides with the disturbance frequency caused by the air flow, the influence is the most significant. At this time, the resonance will increase the displacement of the compressor to the maximum. When resonance occurs, the length of the suction tube equals the resonance length. That L_ suction = L_ total. However, there is currently no accurate calculation of resonance length (calculated values tend to be large). The production generally hope that the suction tube as short as possible, the empirical data shows that the suction tube length is generally 4-6 meters is appropriate.