Toothed-Lobed Gear Pump

a gear pump and toothed-lobe technology, applied in the field of gear pumps, can solve the problems of high shearing stress and high pressure, and the milling action is detrimental to shear sensitive liquids

Inactive Publication Date: 2014-09-18
ROPER PUMP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify central features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.

Problems solved by technology

However, spur pumps subject the spurs to fluid milling action that produces high shearing stress and high pressures.
This milling action is detrimental to shear sensitive liquids, such as delicate food substances (e.g., salsa, relish, mayonnaise, pasta sauce, soup).

Method used

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  • Toothed-Lobed Gear Pump

Examples

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Embodiment Construction

[0021]The exemplary embodiments of the pump are described with reference to FIGS. 1-4. While not being limited to a particular theory, the exemplary embodiments include both spur gears and lobed gears intermeshed to create larger volume pockets in gear sets of a given size. The pockets are larger than the pockets that exist in current lobe pumps and provide the benefit of a pump that better handles shear sensitive liquids. Preferably, the profiles of the spur teeth and of the lobes are involute-shaped to provide rolling contact and a fixed pressure angle between the spur teeth and lobes during engagement. The involute-shaped profiles prevent the teeth and lobes from rubbing and sliding against one another during engagement. Rubbing and sliding increases friction, power consumption, wear and galling to the meshing spur teeth and lobes. While traditional lobe pumps require an external gearbox to synchronize its pump rotors to one another and to keep the rotors from rubbing during oper...

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Abstract

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.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of Invention[0002]This invention relates generally to gear pumps used for liquids, and more particularly, to positive displacement gear pumps that emulate characteristics of lobe pumps.[0003]2. Description of Related Art[0004]Typical spur gear pumps used for pumping hydraulic fluids generally use a drive gear and an idler gear that mesh proximate inlet and outlet openings of the pump. As the drive and idler gears rotate, hydraulic fluid fills the gaps between adjacent spur teeth and is transferred from the inlet through an intermediate transition zone to the outlet. Each of the rotors has a plurality of radially extending, circumferentially-spaced spur teeth with recesses between the teeth. The teeth on each rotor intermesh with the teeth of the other rotor in sealing contact with the recesses of rotors therebetween. The drive gear and idler gear are mounted for rotation on spaced parallel axis with the gears or rotors typically enclosed in ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04C2/08
CPCF01C11/002F04C2/084F04C2/08F04C2/20F04C11/001F04C2/126
Inventor FLAVELLE, WILLIAM D.
Owner ROPER PUMP CO
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