Pump shaft mechanical sealing device with deformed rubber O ring

The utility model discloses a pump shaft mechanical seal device with a heterotypic rubber O ring, which aims to provide a seal method which can prolong the service life of the mechanical seal. The technic proposal is specified as follows: the utility model comprises a rotor ring seat cover, a rotor ring, a stationary ring, a thrust ring combination, a spring seat, a spacer bush, a spring, a B-shape framework oil seal, a baffle and a fixing sleeve. The external diameter of the stationary ring is provided with a middle floating end cover and an end cover that is fixed with the pump body, while between the inner diameter of the end cover and the external diameter of the middle floating end cover and between the internal diameter of the middle floating end cover and the external diameter of the stationary ring are respectively provided with a heterotypic rubber O ring whose structural shape is specified that the front part of the O ring is affixed with a cylindrical circular ring that is in a hollow cylinder, a hollow cone or other cylindrical shapes. The utility model has the advantages as follows: to ensure the floatability of the stationary ring, to compensate the worn axial moving function of the seal ring and to increase the longevity of the mechanical seal and working stability.