一、前 言 用户对压缩机性能的要求是随着时代的变化而发生变化的。例如:从产品质量这个角度来看,过去是以“耐用和可靠”为前提;到了八十年代初,人们将“防止公害” （低噪声、低振动）摆在首位;现在,人们又提出了“节能、高效率”等要求。同时由于应用范围的扩大,某些技术规范提出了更为严格的要求。为了适应这些要求,压缩 First, the foreword The user’s requirement to the performance of the compressor changes with the change of the times. For example, from the perspective of product quality, the past was premised on “durability and reliability.” By the early 1980s, “pollution prevention” (low noise, low vibration) was the priority. Now it is proposed “Energy saving, high efficiency” and other requirements. At the same time due to the expansion of the scope of application, some technical specifications have put forward more stringent requirements. In order to meet these requirements, compression