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US 4,165,206 AGranted
Three gear pump with module construction
AssigneeMicropump, Inc.
InventorsThomas B. Martin, Ferdinandus A. Pieters
Life of this patent
Estimating the term…
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AssigneeMicropump, Inc.
InventorsThomas B. Martin, Ferdinandus A. Pieters
Estimating the term…
A module pump comprises a manifold having intake and outlet connections; a plate to which gears and a "shoe" (which function to define pump chambers for a pair of gears) or, in a pump having three gears two "shoes;" a drive for the gears, which in a preferred embodiment is a magnetic drive; and a barrier between the drive and the plate. Each of the modules is subject to variations in design depending upon end use and hence wide versatility is achieved without great increases in manufacturing cost since only one of the modules need be altered. Use of three gears doubles the capacity of the pump; if three gears are not needed the mounting holes for the third gear may be plugged. A unique bypass is installed in the manifold to permit flow back to the intake when the pressure exceeds an adjustable amount.
A pump comprising a manifold having a parting surface formed with a discharge duct and an inlet duct and outlet and inlet ports, respectively, from the exterior of said manifold to said ducts, a modular plate having first and second faces, said first face being parallel to and communicating with said parting surface, at least one plate inlet port in said plate communicating with said inlet duct and a plate discharge port communicating with said discharge duct, a first gear, a first gear shaft fixed to and supported by said modular plate and mounting said first gear rotatable against said second face, a second gear meshing with said first gear, second gear mounting means fixed to and supported by said modular plate, said manifold being discrete from said first and second gear mounting means, said plate inlet and discharge ports being on opposite sides of the mesh point on said gears, pump chamber defining means sealing relative to said modular plate to enclose a space outward of said second face which includes said plate inlet port and at least that portion of said first and second gears that includes said mesh point and at least two teeth of each gear to either side of said mesh point, and drive means for rotating one of said gears, said pump chamber defining means comprising an imperforate shoe mounted on said modular plate overlying said plate inlet port and a portion of said gears opposite said modular plate to either side of said mesh point, said shoe mounted on said modular plate comprising a disk formed with a first recess for rotation of said gears and a second recess communicating with said first recess and with said plate inlet port.
Dependencies are inferred from the claim text.