1.A kind of new mechanical transmission-the planetary ringy gear transmission is introdueed.

1.提出了一种适用于无游梁抽油机传动机构-行星环传动。

2.The semi freedom short circuit is superposed by parallel plane flow, confluence and ringy turbulence jet.

2.半自由短路流场是平行平面流、环形紊流射流及汇流叠加而成。