Six reasons for wear of dynamic and static rings of mechanical seals of water pumps
The leakage of mechanical seals is mainly caused by wear of dynamic and static rings. The main reasons for wear are as follows:
1. Overtight installation
1.1 Check the dynamic and static rings of the mechanical seal. If there are signs of burning, deep black marks on the surface, hardening or loss of elasticity of the sealing rubber, etc., it is caused by overtight installation.
1.2 Solution: Adjust the installation height. After the impeller is installed, pull the spring with a screwdriver. The spring has a large pulling force. After loosening, reset it and move 2-4mm.
2. Too loose installation
Check the dynamic and static rings of the mechanical seal. If a layer of scale is found, it can be wiped off. If there is no wear on the surface, it is caused by inelastic spring or poor assembly or axial movement of the motor.
3. Cavitation
3.1 Cavitation mainly occurs in hot water pumps. Since the medium is hot water, if the water temperature is too high, steam will be generated. The steam in the pipeline will enter the high part of the pump cavity and cannot be discharged, causing water shortage operation and dry grinding damage of the mechanical seal.
3.2 Treatment method: Install an automatic exhaust valve or replace the mechanical seal.
4 Water quality is poor and there are particles
4.1 Due to poor water quality, small particles in the medium, high hydrochloric acid content, abrasive wear and tear of the mechanical seal, the surface of the flat or stretched surface produces grooves and ring grooves.
4.2 Treatment method: Improve water pressure, medium, and replace the mechanical seal.
5. Dry grinding damage caused by lack of water
5.1 This phenomenon is often seen in the bottom valve installation entrance with negative pressure, air in the water inlet pipe, and air in the pump cavity. After the pump is turned on, the mechanical seal friction will generate high temperature during high-speed operation and cannot be cooled. The mechanical seal and spring tension should be checked. Normal, the friction surface is burnt and black, and the rubber becomes hard and cracked.
5.2 Treatment method: Exhaust the air in the pipeline and pump cavity, or replace the mechanical seal.
6. Assembly problem
6.1 When installing the pump cover, it may not be leveled, resulting in the shaft and the pump cover not being perpendicular, resulting in the dynamic and static planes not matching, and the startup time is not long, resulting in unilateral wear and water seepage.
6.2 Treatment method: disassemble and reassemble, check whether the pump cover is flat.
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