Transient Start-up Dynamics Model and Sealing Performance of Single Metal Seals in Cone Bits

被引：0
|
作者：
Ma Y. [1 ,2 ]
Chen Y. [1 ]
Meng X. [1 ,2 ]
Zhao W. [1 ,2 ]
Peng X. [1 ,2 ]
机构：
[1] College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou
[2] Engineering Research Center of Process Equipment and Remanufacturing, Ministry of Education, Hangzhou
来源：
Zhongguo Jixie Gongcheng/China Mechanical Engineering | 2022年 / 33卷 / 07期
关键词：
Cone bit; Dynamics model; Numerical simulation; Sealing performance; Single metal seal;
D O I：
10.3969/j.issn.1004-132X.2022.07.003
中图分类号：
学科分类号：
摘要：
The reliability and service lifes of the single metal seals were directly affected by the frequent start-up and vibrations of the cone bits during operations. The transient start-up dynamics model of single metal seals under complex working conditions was established based on the thermal-fluid-solid-dynamic coupling field. The lubrication equation and dynamics equation were solved by finite difference method and Newmark method. The effects of the bit speed and axial excitation on the dynamic sealing performance of single metal seals were investigated. The results show that as the bit starts up to constant speed, the liquid film on the end faces of single metal seals always presents a divergent distribution in the radial direction under high pressure condition(p0=30 MPa). The interface temperature rise increases oscillatingly and reach a stable fluctuation under the axial excitation. The instantaneous leakage rate fluctuates alternately between positive and negative, and the amplitude is much larger than that of the steady leakage rate. Especially when the leakage rate is negative, the mud on the outer diameter side of sealing rings may easily invade the sealing gap. With the increase of bit speed and axial excitation load, the dynamic performance of single metal seals is further deteriorated. © 2022, China Mechanical Engineering Magazine Office. All right reserved.
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页码：777 / 785
页数：8
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