10-33 Explain the common causes of mechanical seal leakage in screw compressors and how to deal with it?

Answer: (1) Fault phenomenon.

1) The fixed ring rotates;

2) The surfaces of the moving and static rings are rough, the friction surface is damaged or the friction surface is uneven;

3) The moving ring cannot float along the axial direction;

4) The spring force is insufficient or the spring force is eccentric;

5) The end face is not resistant to corrosion or high temperature;

6) The axial movement of the rotor is too large and the moving ring cannot compensate for the displacement in time;

7) The shaft vibrates severely;

8) The seal is not positioned accurately, the friction pair is not tightly attached, and the seal ring and the moving ring are not tightly attached;

9) The end cover is not fixed correctly and offset occurs.

(2) Treatment measures.
1) Replace the sealing ring to fix the static ring;

2) Improve the end surface finish, improve lubrication conditions, replace or grind the friction surface;

3) Check the spring force and whether the thrust ring is stuck;

4) Adjust or replace the spring;

5) Replace the corrosion-resistant and high-temperature resistant dynamic and static rings to solve the intermittent leakage;

6) Adjust the axial movement;

7) Stop the machine for inspection and solve the vibration problem of the shaft;

8) Check or replace the sealing surface and adjust the positioning;

9) Adjust the end cover fastening screws to be perpendicular to the shaft.