Steady state performance of upstream pumping mechanical seal with tilt seal face of oil-gas mixture pump in gas transportation

Upstream pumping spiral groove mechanical seal of oil-gas mixture pump in gas transportation was taken as the research object, and based on gas lubrication theory and finite difference method, the influence of operation parameters and structure parameters on steady state performance of the seal were researched in the case of considering the relative inclination of seal rings. The numerical results indicate that, compared with film pressure distribution of parallel seal gap, the film pressure peak values and high pressure areas are obviously increased in the region of film thickness decreased when the seal rings have relative inclinations, and the film pressure peak values and high pressure areas are obviously decreased in the region of film thickness increased. No matter how the research parameters change, the opening force, leakage rate and gas film stiffness are all increasing with the increase of relative inclinations. Increasing the rotating speed, designing a smaller equilibrium film thickness or optimizing groove structure parameters can effectively enhance the upstream pumping capacity of the seal to achieve zero leakage of the sealed medium, and can effectively improve the opening performance and stability of the seal.