一、油扩散泵 自进入七十年代以来,国外油扩散泵制造厂的产品都已进入稳定和成熟阶段。很少有新品种出现。各主要生产厂都具有一种或数种系列的定型产品。从文献资料来看,自六十年代后期以来,就很少发表扩散泵理论研究的文章,改进扩散泵局部结构的专利也逐年减少。实验室研究重 First, the oil diffusion pump Since entering the seventies, foreign oil diffusion pump manufacturer’s products have entered a stable and mature stage. Few new breeds appear. Each major manufacturer has one or several series of styling products. From the literature, since the late 1960s, few articles have been published on the theory of diffusion pumps, and the patents for improving the local structure of diffusion pumps have been decreasing year by year. Laboratory research heavy