Experiment on wear behavior of high pressure gas seal faces
Experiment on wear behavior of high pressure gas seal faces
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DOI：
10.3901/cjme.2014.0918.153
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发表时间：
2014-10
影响因子：
4.2
通讯作者：
Jing Xu;Xu-dong Peng;S. Bai;Xiangkai Meng;Ji-yun Li
中科院分区：
文献类型：
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作者：
Jing Xu;Xu-dong Peng;S. Bai;Xiangkai Meng;Ji-yun Li
现有研究表明，密封环端面的机械变形使高压侧流体膜间隙减小，形成发散间隙，高压侧端面磨损比低压侧严重。然而，目前还缺乏足够的实验工作来证明理论结果。本文对高压螺旋槽干气密封进行了试验研究，以证实密封端面的机械变形在高压侧产生端面磨损，并研究了密封环结构对密封端面磨损行为的影响。试验结果表明，密封端面的变形会使高压侧端面发生磨损，泄漏量增大，端面温度升高，均满足理论预测。当密封压力不小于5 MPa时，该压力能提供足够的开启力，使密封面分开。密封圈尺寸对端面磨损有明显的影响。密封环横截面积小的干气密封端面磨损量、泄漏量和端面温度均小于密封环横截面积大的干气密封端面磨损量、泄漏量和端面温度，两种密封端面宽度尺寸的泄漏率相差24%~ 25%。与密封圈尺寸的影响相比，二次O形密封位置对端面变形和磨损的影响较小，转速在0 ~ 600 r/min范围内，二次O形密封位置不同的干气密封端面变形和磨损的差异小于5.9%，通过将端面磨损和密封性能的变化与密封圈机械变形的变化联系起来，本研究为研究高压下干气密封端面变形提供了一种重要的实验方法。
Current researches show that mechanical deformation of seal ring face makes fluid film clearance decrease at high pressure side, thus a divergent clearance is formed and face wear occurs more seriously at the high pressure side than that on the low pressure side. However, there is still lack of published experimental works enough to prove the theoretical results. In this paper, a spiral groove dry gas seal at high pressures is experimentally investigated so as to prove the face wear happened at the high pressure side of seal faces due to the face mechanical deformation, and the wear behavior affected by seal ring structure is also studied. The experimental results show that face wear would occur at the high pressure side of seal faces due to the deformation, thus the leakage and face temperature increase, which all satisfies the theoretical predictions. When sealed pressure is not less than 5 MPa, the pressure can provide enough opening force to separate the seal faces. The seal ring sizes have obvious influence on face wear. Face wear, leakage and face temperature of a dry gas seal with the smaller cross sectional area of seal ring are less than that of a dry gas seal with bigger one, and the difference of leakage rate between these two sizes of seal face width is in the range of 24%–25%. Compared with the effect of seal ring sizes, the effect of secondary O-ring seal position on face deformation and face wear is less. The differences between these two types of dry gas seals with different secondary O-ring seal positions are less than 5.9% when the rotational speed varies from 0 to 600 r/min. By linking face wear and sealing performance changes to the shift in mechanical deformation of seal ring, this research presents an important experimental method to study face deformation of a dry gas seal at high pressures.