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| Research on improvement of reciprocating seal life of special piston pump |
| Ye Xiaoyan,Ding Yana,Xu Jianqiang,Zhang Junhui |
| (Technical and Research Center of Fluid Machinery Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China) |
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Abstract With respect to the problems of piston and filler seal life of special piston pump transporting medium with particles,considering from tribological mechanism of the contact reciprocating seal,the linear velocity of plunger was reasonably controlled to reduce the friction velocity and optimally design the seal of piston and filler through optimal matching of the plunger diameter,the stroke,and the pump speed.By solving the laminar flow in the gap and controlling the pressure of flushing fluid it was guaranteed that in full-pressure seal system,the fluid film of contact zone was working under the mixing lubrication state with a good lubrication.Two packing seal schemes were designed,matched and tested with plunger of different surface treatments and different kinds of filler.It is shown that after accumulating running 4 455 h the wear loss of combination 1 and combination 2 are only 0.03 mm and 0.05 mm,repectively.In practical use,the improved seal design can enhance the life of piston and filler from 1 500 h to more than 4 500 h.
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Received: 23 September 2009
Published: 30 November 2009
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