Experimental study on frictional and sealing performances of packing rings in an oil-free gas compressor |
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Authors: | Xue-bin Yang Xin-qiao Jin Zhi-min Du Tian-sheng Cui Shao-kan Yang |
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Institution: | 1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, 200240, China 3. School of Civil Engineering and Architecture, Jiaxing University, Jiaxing, 314001, Zhejiang, China 2. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China
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Abstract: | To enhance the reliability and to extend service life of packing rings, tribological and sealing performances are investigated
based on the experimental results. Friction force, leakage rate and power consumption of three materials of pressure packing
seals are measured in a refitted vertical gas compressor. The rings are made of common filled polytetrafluroethylene (Filled
PTFE), PTFE reinforced with 30% mass fraction carbon fiber (30%CF+PTFE), and carbon-carbon composites infiltrated with PTFE
(C/C+PTFE), respectively. It is found that packing rings will periodically vibrate with the periodic vibration of pressure
packing after the travel direction of motion abruptly turns to the reverse direction. Furthermore, the amplitude of vibration
slows down with the increasing crank angle. Approximate value of friction force is available by multiple-point fast Fourier
transformation (FFT) employed to process the experimental results by reducing the impact of vibration to a great extent. Of
three materials of rings employed in experiments, Filled PTFE presents minimal leakage rate accompanied with maximum power
consumption. And 30%CF+PTFE exhibits minimum friction power and moderate leakage rate. As for C/C+PTFE, its high mechanical
and thermal properties are favorable factors to enhance the ability of operating under high pressure and velocity and to improve
the wear resistance. Unfortunately, this also leads to a large leakage rate. Comprehensive consideration should be taken into
to evaluate the availability, reliability and service life for a type of packing ring under dry running conditions. |
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Keywords: | frictional performance sealing experimental study packing rings oil-free lubrication |
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