Back to results
US 6,783,342 B2Granted
Method and apparatus for timing rotors in a rotary lobe pump
AssigneeUnited Dominion Industries, Inc.
InventorsDrew Van Norman, Curt Hagen
Life of this patent
Estimating the term…
Abstract
A rotary lobe pump includes two geared-together, counter-rotating shafts, to which are affixed rotors with interdigital lobes. Adjustment of the angular relationship of the rotors uses a clamping device within each rotor. The clamping device consists of a tapered, slotted bushing that is forced between a mating taper on the rotor and a locking device on the shaft by means of a flanged fastener mated to each pump shaft's threads.
Claims17
A rotary lobe pump for pumping material, comprising:
- a pump chamber;
- a first shaft with a threaded section;
- a first tapered bushing, sized to fit said first shaft;
- a first lobed rotor, fitting said first shaft, with an internal tapered region fitted to said first tapered bushing, wherein said first rotor is installed in said pump chamber;
- a first threaded fastening device, mating with the threaded section on said first shaft, that urges said first rotor and said first shaft into frictional contact with said first bushing;
- and
- a seal between said first threaded fastening device and said first lobed rotor that seals said tapered bushing from said pump chamber.
4 more elements
A pump for pumping material, comprising:
- a first shaft;
- a first tapered bushing, sized to fit said first shaft;
- a first rotor, fitting said first shaft, with an internal tapered region fitted to said first tapered bushing;
- a first threaded fastening device that urges said first rotor and said first shaft into frictional contact with said first bushing;
- and
- a first flat on said first shaft, positioned to engage said first tapered bushing and prevent rotation of said first tapered bushing relative to said first shaft.
3 more elements
A pump for pumping material, comprising:
- a first shaft;
- a first tapered bushing, sized to fit said first shaft;
- a first rotor, fitting said first shaft, with an internal tapered region fitted to said first tapered bushing;
- a first threaded fastening device that urges said first rotor and said first shaft into frictional contact with said first bushing;
- and
- a first keyway and key assembly on said first shaft, positioned to engage said first tapered bushing and prevent rotation of said first tapered bushing relative to said first shaft.
3 more elements
A pump for pumping material, comprising:
- a first shaft;
- a first tapered bushing, sized to fit said first shaft;
- a first rotor, fitting said first shaft, with an internal tapered region fitted to said first tapered bushing;
- a first threaded fastening device that urges said first rotor and said first shaft into frictional contact with said first bushing;
- a second shaft with a threaded section;
- a second lobed rotor fitting said second shaft;
- and
- a second flat on said second shaft, positioned to engage a second tapered bushing and prevent rotation of said second tapered bushing relative to said second shaft.
5 more elements
A pump for pumping material, comprising:
- a first shaft;
- a first tapered bushing, sized to fit said first shaft;
- a first rotor, fitting said first shaft, with an internal tapered region fitted to said first tapered bushing;
- a first threaded fastening device that urges said first rotor and said first shaft into frictional contact with said first bushing;
- a second shaft with a threaded section;
- a second lobed rotor fitting said second shaft;
- and
- a second plurality of flats on said second shaft, positioned to engage second tapered bushing and prevent rotation of said second tapered bushing relative to said second shaft.
5 more elements
A pump for pumping material, comprising:
- a first shaft;
- a first tapered bushing, sized to fit said first shaft;
- a first rotor, fitting said first shaft, with an internal tapered region fitted to said first tapered bushing;
- a first threaded fastening device that urges said first rotor and said first shaft into frictional contact with said first bushing;
- a second shaft with a threaded section;
- a second lobed rotor fitting said second shaft;
- and
- a second keyway and key assembly on said second shaft, positioned to engage second tapered bushing and prevent rotation of said second tapered bushing relative to said second shaft.
5 more elements
A pump for pumping material, comprising:
- a first shaft;
- a first tapered bushing, sized to fit said first shaft;
- a first rotor, fitting said first shaft, with an internal tapered region fitted to said first tapered bushing;
- a first threaded fastening device that urges said first rotor and said first shaft into frictional contact with said first bushing;
- a second shaft with a threaded section;
- and
- a second lobed rotor fitting said second shaft, wherein said second lobed rotor is keyed to said second shaft, to rotate therewith.
4 more elements
An apparatus for setting timing of a first lobed rotor configured to mesh with an identical second lobed rotor in overlapping rotational paths in a rotary lobe pump, comprising:
- a first tapered bushing;
- a first shaft configured to accept the first lobed rotor, and having a threaded section;
- a first threaded fasting device mating with the threaded section on the shaft and securing said bushing, the first lobed rotor, and said shaft to rotate together;
- and
- a seal that seals between said first threaded fastening device and said first lobed rotor.
2 more elements
An apparatus for setting timing of a first lobed rotor configured to mesh with an identical second lobed rotor in overlapping rotational paths in a rotary lobe pump, comprising:
- a pump chamber;
- a first tapered bushing;
- a first shaft configured to accept the first lobed rotor, and having a threaded section;
- means for securing said first bushing, the first lobed rotor, and said first shaft to rotate together;
- and
- means for sealing between said means for securing said first bushing and said first lobed rotor that seals said tapered bushing from said pump chamber.
3 more elements
A method for providing adjustable timing of lobe pump rotors, comprising the steps of:
- providing a pump chamber;
- equipping each rotor with a tapered inner mating surface;
- equipping each rotor with a rear stopping surface;
- driving each rotor with a drive shaft having a shoulder that mates to a rear stopping surface of the rotor;
- locating a tapered bushing between at least one of the shafts and its respective rotor;
- applying compression normal to the inner mating surface of the rotor to secure the bushing, rotor, and shaft together;
- and
- sealing between the rear stopping surface and each of the lobe pump of the lobe pump rotors so that the tapered bushing is sealed from the pump chamber.
5 more elements
Dependencies are inferred from the claim text.