瑞典阿特拉斯-考帕考（Atlas Copco）公司在本世纪六十年代问世的DT4和DR4型动力用空压机以短行程著称,在一定程度上反映了现代活塞式压缩机主要结构参数变化的动向。该二机以主要结构参数先进而合理为基础,使重量非常之轻,外形亦异常紧凑;与此同时,其全等温效率仍然保持在相当高的水平上。 DT4型空压机（参看图1）约在1960年业已制成,至于DR4（参看图2）乃系将DT4的冷却方式由风冷改为水冷而得,所以只着重介绍DT4。 Atlas Copco Sweden At the age of 60’s the advent of DT4 and DR4-powered air compressor known for short stroke, to some extent reflects the main structural parameters of modern piston compressors Changes in the direction. The two machines are based on advanced and reasonable main structural parameters, which make the weight very light and extremely compact. At the same time, their total isothermal efficiency is still at a relatively high level. The DT4 compressor (see Figure 1) was made about 1960 and the DR4 (see Figure 2) was made by changing the cooling of the DT4 from air-cooled to water-cooled so only the DT4 was introduced.