Air film stiffness of air film seal in mechanical seal-

Air film stiffness of air film seal in mechanical seal

　2017-10-25　　

Air film stiffness of air film seal in mechanical seal:

The air film stiffness is mentioned in the working principle of air film sealing, which refers to the elasticity of the formed air film. The operational stability of the air film seal is mainly determined by the stiffness of the air film, which reflects the response of the seal to changes in speed. For a given speed increase, when the pressure of the sealing gas is low, the increase of the gap is large (the stiffness of the gas film is small, and the pressure of the sealing gas is high, the increase of the gap is small (the reason for the large stiffness of the gas film is that when the pressure is low, The stiffness of the hydrostatic film is small. In actual sealing, the stiffness of the gas film is of the order of magnitude of the hydrodynamic effect. The stiffness depends on the depth, length and shape of the dynamic pressure groove, and also depends on the rotation speed of the seal ring and the fluid Viscosity. In an experiment with a 130mm gas film seal, when the pressure of the sealed medium is 1MP and the speed is increased from 4000r/min to 16000r/min, the gap increases by 2.5; and when the pressure of the sealed medium is 8MPa, the same The range of speed change, the increase of the gap is less than 17*****, this is because under high pressure, the hydrostatic pressure plays a major role.

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