Toothed-Lobed Gear Pump

摘要

Toothed gears and lobed gears intermesh to create large volume pockets in gear sets of a given size. The pockets are larger than the pockets that exist in current tooth or lobe pumps and provide the benefit of a pump that better handles shear sensitive liquids. Preferably, the profiles of the teeth and of the lobes are involute-shaped to provide rolling contact and a fixed pressure angle between the teeth and lobes during engagement. The toothed gears and lobe gears improve upon standard spur and helical gear designs by omitting alternate teeth on the standard toothed gears and filling in corresponding gaps on the mating standard lobed gears. Additional tooth and lobed gear rotors may be added in tandem as additional pairs of gears to the shafts and circumferentially offset to provide driving tooth engagement between at least one pair of the toothed and lobed rotors at every point around the rotational circumference of the rotors. This spur gear or helical gear configuration eliminates the need for separate driving/synchronizing gears.

主权项

1. A pump, comprising:
a housing having an internal cavity that defines a pumping chamber, an inlet port adapted to allow a fluid into the pumping chamber, and an outlet port adapted to discharge the fluid from the pumping chamber; and a gearbox located in the pumping chamber, said gearbox having a plurality of driving rotors including first and second toothed gears each having a plurality of teeth, said plurality of driving rotors also including first and second lobed gears each having a plurality of lobes wider than the teeth, said first toothed gear and said first lobed gear being a first gear set with said first toothed gear mounted to one of a first rotational axis and a second rotational axis in the pumping chamber adjacent the first rotational axis, and said first lobed gear mounted to the other one of the first rotational axis and the second rotational axis in the pumping chamber, said second toothed gear and said second lobed gear being a second gear set with said second toothed gear mounted to one of the first rotational axis and the second rotational axis in the pumping chamber, and said second lobed gear mounted to the other one of the first rotational axis and the second rotational axis in the pumping chamber, the first toothed gear intermeshed with the first lobed gear in a driving relationship therebetween, the second toothed gear intermeshed with the second lobed gear in a driving engagement therebetween, the teeth of the toothed gears and the lobes of the lobed gears having an involute shaped profile to provide continuously rolling contact and a fixed pressure angle between the teeth and lobes during the driving engagement, wherein one of the first rotational axis and the second rotational axis is a drive shaft.