3DJ型注聚泵降解率偏高原因分析及泵阀改进

对 3DJ型注聚泵的结构分析表明 ,泵降解率偏高的主要原因 :一是泵的容积效率偏低 ,泵阀处流体存在回流现象 ;二是流体流道狭窄且流动过程中变向较多。为此 ,对泵阀做了如下改进 :一是在排出阀座上部增设 1道密封坡口 ,加 1道密封圈 ,防止高压泄漏 ;二是缩小泵阀过流面积且提高研磨技术要求 ;三是简化泵阀流道。试验表明 ,泵阀改进后 ,泵的容积效率可保持在90 %左右 ,降解率保持在 3%以下 ,单井年节约聚合物干粉价值 5 3万元以上

Reasons for higher degrading rate of Model 3DJ polymer injection pump and modification of pump valve

The structural analysis of Model 3DJ polymer injection pump shows that, the main reasons for the higher degrading rate of the pump are: (1) the volume efficiency of the pump is on the low side, and the fluid circumfluence at the pump valve occurs; (2) the flow passage is narrow and the fluid flows in altering directions. Therefore the pump valve is modified as follows: (1) adding a sealing groove in the upper part of the discharge valve seat as well as a sealing ring to prevent leakage at high pressure; (2) decreasing the area of passage of the pump valve and improving the technical requirement of grinding; (3) simplifying the flow passage of the pump valve. Test shows that, after modification of the pump valve, the volume efficiency of the pump can be kept about 90% and the degrading rate below 3%, therefore polymer powder can be saved at a remarkable degree.