Mechanical seals, also known as end seals, have a pair of end faces that are perpendicular to the axis of rotation. The end faces, depending on the fluid pressure and compensating for the mechanical external elastic force, rely on the fit of the auxiliary seal to remain attached to the Other end and slide relative to each other to prevent fluids. leakage.
The failure of mechanical seal leakage is one of the most prone faults in pump failure. Therefore, the mechanical seal of the pump is also one of the more critical consumable parts in the pump components. The mechanical seal material must be suitable for the liquid delivered by the user when the pump is selected. Medium, usually the water pump factory is a fluorine rubber mechanical seal. Some manufacturers are NBR rubber mechanical seals. If the corrosion is serious, the mechanical seal of PTFE is used.
Solution:
1. The first possibility of seeping water at the mechanical seal is the wear of the moving and stationary rings of the machine seal. There are six reasons for the wear of the moving and stationary rings of the machine seal:
2, the installation is too tight. Observe the dynamic and static ring plane of the mechanical seal. If there is severe scorching, the plane is black and very deep, the sealing rubber becomes hard and loses elasticity. This phenomenon is caused by the installation being too tight. Treatment method: adjust the installation height. After the impeller is installed, pull the spring with a screwdriver. The spring has a strong tension. After it is released, it will be reset. There is a moving distance of 2-4MM.
3, the installation is too loose. Observing machine seals, static ring plane, its surface has a very thin scale, can be wiped off, the surface is basically no wear, which is caused by the loss of elasticity and assembly of the spring, or the axial movement of the motor.
4, the water quality is poor with particles. Due to poor water quality, containing small particles and high content of hydrochloride in the medium, the surface of the abrasive wear seal or the surface of the strained surface creates grooves and ring grooves. Treatment: Improve water pressure or medium and replace the machine seal.
5. Dry grinding damage caused by water shortage. This phenomenon is more common in the negative pressure at the inlet of the bottom valve type installation. There is air in the inlet pipe. There is air in the pump cavity. After the pump is turned on, the friction of the machine seal is high during high-speed operation, and it cannot be cooled. Check the machine seal and the spring tension is normal. The friction surface is burnt black and the rubber is hard and cracked. Treatment: Displace the mechanical seal despite the air in the channel and pump chamber.
6, cavitation. Cavitation is mainly generated by hot water pumps. Since the medium is hot water, the water temperature is too high to generate steam, and the vapor in the pipeline enters a high place in the pump chamber. This part of the vapor can not be eliminated, resulting in water shortage operation, machine seal dry grinding failure, cavitation automatic discharge Air valve, replace the machine seal.
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