Reasons for Failure of Mechanical Seal of Multistage Centrifugal Pump
Axial channeling of shaft of multistage centrifugal pump is large
The sealing surface of mechanical seals must have a certain specific pressure, so as to play a sealing role, which requires the spring of mechanical seals to have a certain amount of compression, to give a thrust to the sealing face, rotating to make the sealing surface produce the required specific pressure. In order to ensure this specific pressure, mechanical seal requires that the pump shaft should not have too much channeling, generally to ensure less than 0.5 mm. But in the actual design, because of the unreasonable design, the shaft of multi-stage centrifugal pump often generates a lot of channeling, which is very unfavorable to the use of mechanical seals. This phenomenon often occurs in multi-stage centrifugal pumps, especially in the process of pump start-up, channeling is relatively large.
2. Axial force is too large
Mechanical seals can not withstand the axial force in the use process, if there is an axial force, the impact of mechanical seals is serious. Sometimes the axial force of multistage centrifugal pump is not balanced because of the unreasonable design of the axial force balancing mechanism and the reasons of manufacture, installation and use. Mechanical seals withstand an axial force, and the temperature of sealing gland will be higher when running. For polypropylene medium, it will be melted at high temperature. Therefore, the sealing effect of multi-stage centrifugal pump will be lost soon after starting, and the sealing end surface will appear intermittent leakage phenomenon when multi-stage centrifugal pump is stationary.
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