Analysis on Self-cleaning of Diffuser Self-pumping Hydrodynamic and Hydrostatic Mechanical Seal
Traditional fluid wedge mechanical seals require an external fluid blockage system to reduce the impact of particle impurities on sealing performance.For a new type of diffuser self-pumping mechanical seal,the DPM model in FLUENT was used to study the effects of different discrete phase parameters,spiral groove structural parameters,and oper-ating conditions on the motion and discharge characteristics of particles in the dynamic pressure groove.The results indica-ted that the opening force and leakage rate of the liquid film on the end face under the conditions of containing solid parti-cles are greater than those under pure fluid conditions,with a maximum increase of 6.1％in leakage rate.At low particle volume fraction,the chip removal rate gradually increases and reaches the maximum at 7％volume fraction,followed by a rapid decrease in chip removal rate.As the particle diameter increases,the chip removal rate shows a downward trend,and the larger the particle diameter,the faster the end face chip removal rate decreases.The structural parameters of the spiral groove mainly changes the amplitude and range of pressure gradient distribution in the spiral groove.At low rotational speed,the effect of pressure gradient force on particles is more significant.High speed and low medium pressure conditions can significantly improve the efficiency of chip removal at the end face,with a maximum chip removal rate of 92.3％.
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