Abstract: Because dry gas seal end clearance is only 3 to 5 microns, test technology of gas film parameters and displacement variation for end flow field is difficult, and it is meanwhile a key to study the stable operation of dry gas seal. Based on Labview test system software platform, end face parameters test system of dry gas seal is established through writing test procedures, and corresponding test technology is determined, and appropriate sensor and other hardware equipments are chosen. Using the necessary anti-disturbance measures, parameters (leakage, power consumption, membrane pressure) influencing end face sealing performance and parameters (film thickness and vibration displacement) influencing end face stability are being tested. The effects of pressure and rotate speed to end face parameters under different conditions are researched. Tests show that gas film pressure, gas film thickness, the leakage and power consumption increase with increasing of pressure and rotate speed, displacement of gas film and stationary ring decreases with increasing of pressure and rotate speed. Gas film amplitude is very small, and it is just 0.04 to 0.16 μm in special condition, which reflects that performance of stationary ring following rotating ring is better. At the same time, gas film stiffness increases with increasing of pressure and rotating speed, which reflects that operational performance of dry gas seal is stable under high pressure and high rotate speed.

Key words: Dry gas seal, Labview software, Spectral analysis, Test system, Vibration stability