一、问题的提出螺杆压缩机,就其作用原理而言,与活塞式压缩机一样,是借助于容积的缩小而使气体压力升高,因此,它也属于容积式。但是,螺杆式压缩机的转子作高速旋转运动,没有往复运动和往复惯性力,就其运动形式而言,则应属于回转式,与透平压缩机又有近似之处。这样,螺杆压缩机就具有高的热力效率和广阔的工作范围以及重量轻、体积小等一系列优点。特别是高效率新型不对称形线的出现及制造工艺的日趋成熟,再加上它本身对湿行程不敏感,能量可无级调节等,使它得到迅速发展,近年来广泛地用于制冷工业。螺杆式压缩机与活塞式压缩机虽然同属于容积式,同样又都具有界限分明的吸气、压缩、排气三个工作过程。但是,二者实现这三个过程所通过的手段不一样。活塞式压缩机是 First, the problem put forward Screw compressors, in terms of their role and principle, with the piston compressor, the volume is reduced by the gas pressure is increased, therefore, it also belongs to the volume. However, the screw compressor rotor for high-speed rotary motion, there is no reciprocating and reciprocating inertia, in terms of its form of motion, it should belong to the rotary type, and the turbine compressor is similar. In this way, the screw compressor has high thermal efficiency and a wide range of work and light weight, small size and a series of advantages. In particular, the emergence of high-efficiency new asymmetric shaped wire and the maturing of the manufacturing process, coupled with its own wet-stroke is not sensitive to the energy stepless adjustment, so that it has been rapid development in recent years is widely used in refrigeration industry . Screw compressors and piston compressors, though both belong to the volume type, also have the same distinct suction, compression, exhaust three working processes. However, the two have different means of achieving these three processes. Piston compressor is