The fracture of piston rod of new hydrogen compression pump is studied by metallography and electron probe in this paper.

用金相显微镜和电子探针对新氢压缩机活塞杆断口进行了分析。

The application of concentration system with multi - effect thermal compression pump could reduce the consumption of the steam and lower the production cost.

采用多效带压泵的浓缩系统，可大大减少加热蒸汽的消耗量，降低生产成本。

Straight line motor twin-tub compression pump of the present invention is compression pump with novel double-stator straight line motor and twin cylinder structure.

本发明所述的直线电机双缸压缩泵，是在压缩泵内设置了新型的 双定子直线电机和与之相配的双汽缸结构。

One effective for asthma in 5-micron particles below normal compression pump atomizer atomized particles 5 microns or less in the percentage content of more than 50%.

其中对于哮喘的有效颗粒在5微米以下，一般的压缩雾化泵的雾化颗粒在5微米以下的百分含量在50%以上。

As the Roots pump is a non-vacuum inside the compression, the compression ratio is usually very low, so high, medium and vacuum pumps need to pump before.

由于罗茨泵是一种无内压缩的真空泵，通常压缩比很低，故高、中真空泵需要前级泵。