The main parameters that affect the performance of dry gas sealing

The main parameters that affect dry gas seal performance The main parameters that affect dry gas seal performance The parameters that affect dry gas seal performance are divided into structural parameters and mechanical seal operating parameters. The structural parameters of the end face have a great influence on the stability of the seal, and the operating parameters have a great influence on the leakage of the seal. 1. The influence of the structural parameters of the seal end face on the stiffness of the gas film 1. Theoretical research on the influence of the shape of the dynamic pressure groove shows that the hydrodynamic effect of the mechanical seal produced by the logarithmic spiral groove is the strongest, the stiffness of the gas film is the largest, and the stability is the best. Therefore, most dry gas seals use logarithmic spiral grooves as sealing dynamic pressure grooves. 2. Theoretical research on the influence of the depth of the dynamic pressure groove shows that when the depth of the fluid dynamic pressure groove and the thickness of the gas film are of the same magnitude, the air film stiffness of the seal is the largest. Therefore, in practical applications, the depth of the dynamic pressure groove of the dry gas seal is generally 3-10 microns. 3. The influence of the number, width and length of the dynamic pressure grooves on the dry gas seal. The more the number of dynamic pressure grooves, the strongest dynamic pressure effect. However, when the number of dynamic pressure grooves reaches a certain number and the number of grooves is increased, the dry gas sealing performance will be improved. The impact has been small. In addition, the width and length of the dynamic pressure groove have a certain influence on the sealing performance. 2. The influence of operating parameters on the leakage of the seal 1. The influence of the seal diameter and rotation speed on the leakage. The larger the seal diameter and the higher the rotation speed, the greater the linear velocity of the seal ring and the greater the leakage of the dry gas seal. 2. The influence of medium pressure on the leakage rate. In the case of a certain sealing working gap, the higher the sealing gas pressure, the greater the amount of gas leakage. 3. The influence of medium temperature and viscosity on the leakage rate The influence of medium temperature on the leakage rate of the seal is formed by the influence of temperature on the viscosity of the medium. The viscosity of the medium increases, the dynamic pressure effect increases, and the thickness of the gas film increases, but at the same time the resistance to the gap between the seal end faces increases. Therefore, it has little effect on the leakage of the seal. Keywords: mechanical seals, mechanical seals