1、 Key points of daily maintenance
Cleaning and Inspection
Sealing surface cleaning: Regularly clean the end faces of the dynamic and static rings, using soft gauze or specialized cleaning tools to avoid scratching the surface.
Auxiliary seal ring inspection: Check whether auxiliary seals such as O-rings, V-rings, etc. are aging, deformed, or damaged, to ensure that the compression meets the design requirements (such as O-ring compression ratio is usually 8% -30%).
Cooling system maintenance: Check the coolant level (once per shift, add to 2/3 of the oil pan height if insufficient), replace the coolant every month to prevent deformation or cracking of the sealing surface due to overheating.
Lubrication and fastening
Lubrication management: Use lubricants compatible with sealing materials to regularly lubricate the contact surface between the moving ring and the shaft, reducing friction and wear.
Fastener inspection: Before starting up daily, check whether the tightening ring screws and gland bolts are loose, ensure that the sealing surface is evenly compressed, and prevent leakage.
Monitoring of operating parameters
Temperature control: Control the temperature of the sealed chamber within the recommended range (usually ≤ 150 ℃) to avoid vaporization of the sealing liquid or material aging.
Vibration monitoring: By using vibration sensors or manual inspections, the vibration level of the monitoring equipment can be monitored. Excessive vibration can cause seal misalignment or increased wear.
2、 Common fault diagnosis and handling
Leakage fault
Reason: Wear of sealing end face, failure of auxiliary sealing ring, improper installation (such as sealing surface not fitting properly, impurities entering).
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Replace the worn dynamic and static rings or re grind the end face to ensure that the surface roughness Ra is ≤ 0.8 μ m.
Adjust the compression amount of the sealing ring or replace the material (such as high-temperature resistant fluororubber) to prevent aging and leakage.
Reinstall the mechanical seal, ensure that the positioning screws are tightened, the pressure cover is tightly pressed, and clean the impurities inside the sealing chamber.
Vibration and heating faults
Reason: Excessive axial displacement (due to unreasonable design or bearing wear), insufficient clearance between the dynamic and static rings, and improper matching of friction pairs.
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Adjust the axial force balance device to control the axial displacement within ≤ 0.3mm and eliminate the axial displacement.
Increase the inner diameter of the sealing chamber or decrease the outer diameter of the rotating ring to ensure that the gap between the dynamic and static rings is ≥ 0.75mm.
Change the materials of the dynamic and static rings (such as using tungsten carbide or ceramics) to improve their temperature and corrosion resistance.
Sealing ring failure
Reason: Improper selection of sealing ring material, insufficient compression during installation, or reversed installation (such as incorrect direction of V-ring).
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Choose the appropriate sealing ring material (such as polytetrafluoroethylene, nitrile rubber) based on the properties of the medium (such as acidity or alkalinity).
Reinstall the sealing ring to ensure that the compression meets the design requirements (such as an O-ring compression rate of 15% -25%), and check if the installation direction is correct.