Importance

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Abstract

An axial air gap magnetic drive motor having a diaphragm to seal the drive motor from the pump is disclosed. The drive motor drives a positive displacement pump through a magnetic coupling on both sides of the diaphragm. The gerotor pump includes an annular backing plate member, an inlet member and a three piece pump which is rotated by the drive motor through the magnetic coupling. The three piece pump includes a male rotor gear, an annular female gear cooperatively engaging the male rotor gear and an outer annular member disposed around the annular female gear. The inside diameter of the outer annular member is eccentric a predetermined radial distance from the axial centerline. The outer annular member, the inlet member and the backing plate member are pinned to one another to prevent relative movement therebetween. A pair of biasing members are mounted between the opposite end of the housing and the inlet member to urge the inlet member towards the three piece pump and the backing plate member to reduce axial clearance therebetween.

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First Claim