Pump having magnetic drive

Claim 1

In a fluid-handling apparatus including, in combination, an electric motor and a housing having a fluid chamber, an inlet port and an outlet port communicating therewith, a magnetic drive comprising a rotatable driver member and a driven member, said driver member being mounted on a drive shaft of said electric motor for transmitting rotation to said driven member, a second shaft fixedly mounted on said housing coaxially with said drive shaft, said second shaft having mounted thereon said driven member for synchronous rotation with said driver member, said driven member comprising an impeller having blade means for imparting motion to a fluid being handled, said driver member and said driven member comprising a plurality of segmental magnets mounted radially in an annular configuration, a diaphragm positioned between said driver member and said driven member separating said fluid chamber from the portion of said housing containing said driven member to keep said fluid within said fluid chamber, the improvement wherein each of said magnets is provided with an aperture in the central portion thereof and comprises a pair of inwardly sloping side walls, said side walls being provided with longitudinal notches extending at the edge of a face of each of said magnets, each of said apertures being of substantially similar configuration to the outer perimeter of each of said magnets.