Mechanical seal having auxiliary lubricating device

Abstract

A mechanical seal having an auxiliary cooling and lubricating device, comprising a sliding pairs, a mating ring (9), a sliding ring (8), a mating ring driving sleeve (7), a sliding ring retainer (5), a cartridge (1), a wave spring (3), a retainer (2), a bellow (4) and a rubber cup (10); the mating ring driving sleeve (7) is fixed on a shaft and the shaft drives the mating ring driving sleeve (7) to rotate; the mating ring driving sleeve (7) is provided thereon with multiple blades (6), the blades (6) spinning a cooling medium around the mechanical seal toward the contact area of a sliding pair while the mating ring driving sleeve (7) drives the mating ring (9) to rotate so as to guarantee that the sliding pair is constantly in a lubricating and cooling state; meanwhile, the mating ring driving sleeve (7) is provided by means of a variable diameter design with transitions steps, and multiple windows are provided at end faces of the steps; the variable diameter of the mating ring driving sleeve (7) satisfies a function of driving the mating ring (9), while also directly exposing the mating ring (9) in a cooling liquid so as to help cool the mating ring (9); the windows at the end faces of the steps are first used for forming driving claws while helping to circulate a cooling liquid that is surrounded by the blades (6) and that is located around the mechanical seal as well as the cooling liquid at the periphery such that temperature remains stable around the mechanical seal. By means of said mechanical seal, the temperature of the sliding pair may be rapidly reduced to prevent seal failure caused by the decomposition (melted) of the rubber components due to dry running, thereby extending the service life of the mechanical seal, and solving the problem of noise for the mechanical seal.

Dependencies are inferred from the claim text.