A magnetically driven gear pump having a housing, a rotatable annular magnetic drive assembly magnetically coupled to but spaced from an annular driven magnet and rotor gear assembly with an annular canister disposed therebetween, and wherein when the annular magnetic drive assembly is rotated, Chemical pumpsthe annular driven magnet and rotor gear assembly rotate on a first shaft portion of an offset stationary shaft and the rotor gear drives an idler gear that rotates on a second shaft portion of the offset stationary shaft. A magnetically coupled gear pump comprising: a pump housing having at least one inlet and at least one outlet; a rotatable annular magnetic drive assembly disposed in the pump housing and having a recess at one end;Magnetic pumps an annular canister having a recess at one end, having at least a portion of the canister disposed within the recess of the rotatable annular magnetic drive assembly, and being in sealing engagement with the pump housing; an annular driven magnet and rotor gear assembly having a magnetic portion disposed substantially within the recess of the annular canister, and the magnetic portion being substantially in magnetic alignment with the rotatable annular magnetic drive assembly; an offset stationary shaft having first and second shaft portions with a longitudinal axis of the first shaft portion being parallel to but spaced from a longitudinal axis of the second shaft portion; and wherein when the rotatable annular magnetic drive assembly is rotated, the annular driven magnet and rotor gear assembly rotate on the first shaft portion of the offset stationary shaft and the rotor gear drives an idler gear that rotates on the second shaft portion of the offset stationary shaft. In many pumping applications, it is desirable to avoid potential seal leakage by not using seals in conjunction with rotating parts. Accordingly, it has become more common in the pump arts to employ a magnetic drive system to eliminate the need for seals along rotating surfaces. While such pumps may still employ static seals, because of their lack of dynamic or rotational seals, they have become known as a

2012-01-13

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