| 专利名称 | Oil submersible pump | 申请号 | US21079088A | 专利类型 | US | 公开（公告）号 | US4865519A | 公开（授权）日 | 1989.09.12 | 申请（专利权）人 | 中国科学院工程热物理研究所 | 发明（设计）人 | DIANKUI LIU ; BENYUAN HE ; YONGQIANG CUI | 主分类号 | F04D29/44 | IPC主分类号 | F04D29/44 | 专利有效期 | Oil submersible pump 至Oil submersible pump | 法律状态 | 说明书摘要 | A multi-stage centrifugal pump mainly used for oil extraction, which includes two essential components, namely, a rotational impeller comprising several blades and a stationary diffuser. The shapes of blades and flow passages are designed by using three-dimensional flow theory. The configuration is characterized by the impeller length and the diffuser length being almost equal, with the moving blade being provided with an extension at the trailing edge, smaller wrap angle of the stationary diffuser blade, shorter single-stage and smaller outside diameter, and so forth. |
1、源头对接，价格透明
2、平台验证，实名审核
3、合同监控，代办手续
4、专员跟进，交易保障