Contrast experiments between gravityfeeding and direct expansion refrigeration system were carried on, performance characteristics difference of the two refrigeration systems were found out.
并与直接膨胀供液制冷系统做同工况下的对比实验，分析两种系统的工作特性差异。
2
The mechanism of filling accuracy and filling speed of gravity gravimetric filling machine were studied from the machine feeding material aspect.