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柱塞密封作为钻井泥浆泵关键部件,在深井和高压工况下,柱塞密封经常出现密封失效问题,而导致钻井泥浆泵工作效率低,甚至出现安全事故。本文通过建立二维轴对称仿真分析模型,讨论了密封过盈量、轴向压紧力、密封圈个数对柱塞密封性能的影响。结果表明:影响密封能力的程度依次为:轴向压紧力最大,其次为密封过盈量,密封圈个数最小;柱塞V形密封圈的密封能力随压紧力的增加呈等倍增长的趋势;增加密封圈个数并不能增加密封能力,第一道密封圈起到密封关键作用,并且其肩部的Von Mises应力非常大,也是最先遭到破坏的;密封过盈量小于0.4mm时,密封能力不会发生变化;轴向压紧力达到15MPa后,密封圈的Von Mises应力急剧上升,继续增加轴向压紧力容易导致密封圈破坏,发生密封失效。
As a key component of drilling mud pump, plunger seal often has seal failure problems under deep well and high pressure conditions, resulting in low efficiency of drilling mud pump and even safety accidents. In this paper, by establishing a two-dimensional axisymmetric simulation analysis model, the effects of seal interference, axial compression force and the number of seals on the plunger sealing performance are discussed. The results show that the degree of sealing ability is as follows: the axial compression force is the largest, followed by the seal interference, the smallest number of seals; Sealing capacity of the plunger V-ring with the increase of pressing force showed an equal growth Trend; increasing the number of seals does not increase the sealing capacity, the first seal plays a key role in sealing, and shoulder Von Mises stress is very large, but also the first to be destroyed; seal interference is less than 0.4 mm, the sealing ability will not change; after the axial compression force reaches 15MPa, the Von Mises stress of the sealing ring rises sharply. Continuously increasing the axial pressing force will easily lead to the failure of the sealing ring and seal failure.