Pair of conveyor worms for rotary positive-displacement pumps

Details Pair of conveyor worms for rotary positive-displacement pumps Pair of conveyor worms for rotary positive-displacement pumps

1996-07-19

1997-09-23

Vrablik, John J.

Rotary expansible chamber devices

Methods

4182013, F04C 216

Patent

active

056697651

ABSTRACT:
A pair of conveyor screws for rotating positive-displacement pumps, the conveyor screws including a rotor and a contra-rotor, wherein the conveyor screws comprise a screw spindle pump and rotate with zero contact in a bore and in flanks and rotate at the same speed, the conveyor screws form loss gaps and have the same thread depth, the same number of threads and flank profiles which are symmetrical. The conveyor screws include a tooth base positioned below a flank profile reversing point and a tooth head positioned above the flank profile reversing point, wherein a profile-produced loss gap height in an axial section on a pitch circle is kept constant for a specific rotor diameter by shifting the flank profile reversing point as a function of a rotor pitch.

REFERENCES:
patent: 3288077 (1966-11-01), Meskat

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