中文Mechanical sealing problems and solutions for rotary pumps
2020-11-03
Rotary pumps are widely used in industry and are prone to pump seal failure and leakage during equipment operation. How to solve these problems when encountering them? The following is an introduction to the mechanical seal problems and solutions of the rotor pump.
1. Leakage during static testing of rotor pump installation
After the installation and debugging of the mechanical seal, it is necessary to conduct relevant functional tests on the pump to observe the leakage of the equipment. If there is a small leakage, the reason is often due to problems with the sealing ring of the dynamic or static ring; If there is a significant leakage, it may be a problem between the friction between the dynamic and static rings. When a pump seal leakage occurs, the first thing to do is to observe the leakage amount of the pump, determine the approximate position, and then manually turn and observe.
2. Errors that occurred during the trial operation of the rotor pump
After the above stages of testing, the centrifugal force generated by high-speed rotation during the operation of the pump will also suppress the leakage of the medium. Therefore, during the trial operation, the mechanical seal leakage between the discharge shaft and the end cover seal failure is basically caused by the friction between the dynamic and static rings being damaged. The main reasons for these phenomena are: suction, cavitation, and pressure suppression during operation, which cause significant axial force and ultimately result in separation of the contact surfaces between the dynamic and static rings; Excessive compression leads to severe scratches on the friction surface; The sealing ring of the moving ring is too tight, and the spring cannot adjust the axial floating amount of the moving ring; The sealing ring of the static ring is too loose, and when the dynamic ring floats axially, the static ring detaches from the static ring seat.
3. Due to corrosion of the equipment, the mechanical seal of the rotor pump failed: corrosion occurred at the junction of the sealing surfaces, resulting in penetration and pump leakage.
4. Due to the high temperature effect, mechanical seal failure occurs in the rotor pump: radial cracks can occur at the sealing surface due to long-term dry friction of the equipment, sudden interruption of cooling water, impurities entering the sealing surface, and suction; Some auxiliary seals can age, crack, and eventually become hard and lose elasticity under abnormal temperatures. These phenomena can also lead to pump leakage.
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