Importance

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Abstract

A metering pump includes a set of externally-toothed gears, with a first of the gears, the drive gear, having a central opening to receive a drive shaft. The gears are supported within a housing defined between first and second housing plates. The first and second housing plates each have central openings aligned with the central opening in the drive gear, and inner wall surfaces adjacent opposite side surfaces of the gears. The first and second gears are rotatably supported within the housing such that the rotational axis of the gears are parallel to one another, and certain of the gear teeth intermesh together when the gears rotate. A first port in the housing provides an inlet fluid flow to an inlet side of the meshing gear teeth, while a second port provides an outlet fluid flow from an outlet side of the meshing teeth. An annular resilient, face-type lip seal is disposed against each side surface of the drive gear, surrounding the central opening in the gear. The lip seals are located in annular grooves formed in the opposing surfaces of the adjacent housing plates surrounding the central openings in the plates, and fluidly seal to the respective surfaces of the first gear during rotation of the gears to prevent fluid leakage into the central opening in the gear.

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First Claim