1.前言在电子、食品、化学等工业部门中广泛使用的无油压缩机一般以活塞式居多,但近年来,用户认为螺杆式压缩机具有可靠性高、振动噪音少等优点,在容量为75kW以上的压缩机中采用两级压缩的螺杆式正在成为主要趋势。然而,对于大量使用的75kW以下的压缩机来说,两级压缩的螺杆式由于结构复杂,难以和往复式进行竞争,至今国内外尚未有商品化的例子。为此,迫切要求尽快研制一种零部件少、结构简单、价格便宜的单级压缩机。单级机的压力比和排气温度都比两级压缩机要高,运行条件 1. Introduction In the electronics, food, chemical and other industrial sectors widely used in oil-free compressors are generally the majority of piston, but in recent years, the user that the screw compressor with high reliability, vibration and noise less advantages in the capacity of The use of two-stage compression screws in compressors above 75kW is becoming a major trend. However, for the heavy-duty compressors below 75kW, the two-stage compression screw type has not yet been commercialized at home and abroad due to its complex structure and difficulty in reciprocating competition. Therefore, it is urgently required to develop a single-stage compressor with few parts, simple structure and low price as soon as possible. Single-stage pressure ratio and exhaust temperature than the two-stage compressor to high operating conditions