Rotary pump having helical gear teeth with a small angle of wrap
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United States of America Patent
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-
Apr 28, 1992
Grant Date -
N/A
app pub date -
Dec 17, 1990
filing date -
Dec 17, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary pump comprises a housing and at least a pair of rotatable, meshing gears positioned within the housing. The meshing gears define teeth which extend helically in the general direction of the axis of each gear rotation. A flow inlet and a flow outlet are positioned in the housing to permit fluid to flow longitudinally along the gears generally in the direction of said axis as the gears rotate relative to each other. By this invention, the helically extending teeth define on at least one of the gears a total angle of wrap from end-to-end of the gear upon which they are carried of essentially 360 divided by twice the number of teeth on the gear, in degrees, multiplied by a number N of 1/2 to 3. This relatively low total angle of wrap provides significant improvements in gear pumps.
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