Shaft sealing device for centrifugal pump

The utility model relates to a shaft sealing device for a centrifugal pump, organically composed of a sealing portion namely a sealing friction pair (7, 10), a spring compensation mechanism (9, 11), an O-shaped cycle (14), a framework oil seal (15), and a lubrication and cooling portion namely a ventilation boss oil chamber (12). The lubricating oil in the ventilation boss oil chamber (12) can guarantee to establish the oil film of the sealing friction pair (7, 10) and good lubrication and cooling. The utility model has the advantages of simple structure, low cost, simple operations management, reliable working, and long service life, in particular to being suitable for centrifugal mortar and mud pumps on an occasion with high suspended solids and strong abrasive particle medium.