Machine impurities into the seal face wear and tear caused by

The seal face contact and friction is normal, can enter the seal face of the solid impurities are very subtle , it is easy to seal water away , so there is no leakage of the sealing effect . Larger solid particles into the seal face , causing increased wear of the case , are not working properly sealed occur . Divided into the following situations:
( 1 ) In the downtime or maintenance after the initial test , the pipe seal dirty or poor water quality , solid impurities easy access to the seal faces . Therefore, the mechanical seal friction surface wear faster .
( 2 ) double mechanical seal in the sealing water pressure fluctuations , or below the pump , the pressure inside the pump body with chemical impurities into the medium from the inner end face of the seal chamber , some impurities remain in the sealed end face , resulting in increased wear and tear , single-acting mechanical seal built , due to media pressure fluctuations , seal face into the possibility of impurities is much smaller than the double-end , relatively longer life expectancy.
( 3 ) due to various reasons impurities into the seal face . Early peroxide mechanical seal face severe wear , wear mechanism from view, the main particle abrasion , adhesion wear only take place in a particular case , so we only discuss the wear particles . Peroxide particles wear rate is high , greatly reducing the service life of mechanical seals . Wear particles not only soft sealing ring ( graphite ring ) wear , but also hard seal ring ( mainly carbide ring ) wear particles generally worn surface has obvious rules nicks and grooves. The essence of wear particles in the vertical component of the hard particles under the action of the friction surface piercing , while under the action of the tangential component of the relative movement, so that the friction surface micro- machining process and plow . Wear particles and the hardness of the material not only than the pressure on the end face , and the microstructure of the material and the test temperature , load and stress the nature of the size , the size and hardness of the abrasive and chemical properties of the friction surface and other factors.
Friction pairing material hardness difference , tamper seal tape a great impact on the wear particles . Friction large difference in hardness , wear particles appear much less the case , friction and wear rate is also small ; but the hardness difference is small , the more wear particles occurs . The main reason is because when particles invade friction , high hardness in the ring , only embedded in graphite or graphite ring on the ring groove on wiping the hard ring is not bruised, but also to maintain the original finish , over a period of time the particles may also be sealed water washed away. The particles invade the friction surface , moving ring hardness is low, due to the hard ring is scratched , the effect of vibration and eccentric , such as rasp file graphite ring , causing serious wear and tear. Meanwhile abrasions ring itself is also growing . After running-in , snap ring groove surface and the surface of the graphite ring concentric grooves gradually coincide , then the leakage reduction .
In addition , stationary ring or ring leakage inlet end , if the chamfering is too large, larger particles can also lead into the friction surface along the slope , causing premature wear .
For special circumstances , tamper evident label special measures should be adopted , in the car or the initial sealing water is quite poor , in order to avoid premature wear of the mechanical seal failure , end than the pressure to increase the use of temporary practice , you can receive significant effect , due to increase spring pressure and no significant increase in friction wear particles contrary avoid early wear and extended service life.