Research on Sealing Performance of Hydrostatic Pressure Mechanical Seal

The hydrostatic pressure mechanical seal has many advantages, and it can be used in rotating machines with lower speed. Based on the externally pressurized stable gas lubrication theory, the control equation of end face flow field for hydrostatic pressure mechanical seal with orifice compensation was established. The functional extremum algorithm and the finite element method were used to solve this equation. The effects of gas film thickness, air supply pressure, throttle orifice number and diameter, on face opening force and gas film stiffness were discussed in detail. The results show that the opening force decreases with the widening of face clearance and increases with the rising of air supply pressure. The gas film stiffness increases with the decreasing of the throttle orifice diameter, and increases with the reducing of the throttle orifice number.