1. Most of the submersible sewage pump mechanical seal after dismantling, static and dynamic ring of the auxiliary seal, and some have been rotten, and some have been rotten, resulting in a large number of mechanical seal leakage and even the phenomenon of grinding shaft. Due to the high temperature, the sewage in the weak acid, weak base of static ring and moving ring auxiliary rubber sealing parts corrosion, resulting in a mechanical leakage is too large, dynamic and static ring rubber seal ring materials for nitrile - 40, not high temperature resistant, acid and alkali resistance, when the water is acidic alkaline corrosive.
Solution: the corrosive medium, rubber parts should be used in high temperature resistance, weak acid, weak base of fluorine rubber.
2. Solid particles and impurities caused by the mechanical seal leakage if solid particles into the sealing face and will scratch or accelerate the abrasion of the seal and high-temperature gear pump scale and oil in the shaft (sleeve) surface of the stacking velocity exceeds the friction pair wear rate, resulting in dynamic ring cannot wear compensation displacement. The hard to hard friction pair running life to than hard on graphite friction pair of long, because solid particles embedded in a graphite seal ring sealing surface.
Solution: in the solid particles easily enter the position should be the use of tungsten carbide tungsten carbide friction pairs of mechanical seals.
